Inorganic Chemistry

CSIR NET Chemical Science — Main Group Elements previous year questions

84 questions · 2011–2021 · all with verified answer · last checked 2026-11-06

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Q1 · June 2021 · 2 marks

The correct order of the electron affinity for one-electron gain of the elements is

(a) \mathrm{F}>\mathrm{Cl}>\mathrm{Br}
(b) P > N > As
(c) \mathrm{S}>\mathrm{Se}>\mathrm{O}
(d) \mathrm{K}>\mathrm{Li}>\mathrm{Na}

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Answer: (c)

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Q2 · June 2021 · 2 marks

Which of the statements (A-D) given below are correct for \mathrm{B}_{2} \mathrm{H}_{6} molecule:

(a) Addition of \mathrm{Et}_{2} \mathrm{O} . \mathrm{BF}_{3} to \mathrm{NaBH}_{4} in a polyether solvent produces \mathrm{B}_{2} \mathrm{H}_{6}. A, B and C
(b) It has \mathrm{D}_{2 \mathrm{~d}} symmetry. A, C and D
(c) Reaction of \mathrm{B}_{2} \mathrm{H}_{6} with \mathrm{NMe}_{3} give \mathrm{Me}_{3} \mathrm{~N} . \mathrm{BH}_{3}. A and B only
(d) It is diamagnetic. B and D only

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Answer: (b)

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Q3 · June 2021 · 2 marks

Which of the following reaction (s) do(es) NOT occur (i) \left[\mathrm{NPCl}_{2}\right]_{3}+6 \mathrm{NaF} \xrightarrow[\text { Reflux }]{\mathrm{MeCN}}\left[\mathrm{NPF}_{2}\right]_{3}+6 \mathrm{NaCl} (ii) \mathrm{n} \mathrm{PCl}_{5}+\mathrm{nNH}_{4} \mathrm{Cl} \xrightarrow[\text { Reflux }]{\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{Cl}}\left[\mathrm{NPCl}_{2}\right]_{\mathrm{a}}+4 \mathrm{nHCl} \quad[\mathrm{n}=3,4,5 ] (iii) \mathrm{nPF}_{5}+\mathrm{nNH}_{4} \mathrm{~F} \xrightarrow[\text { Reflux }]{\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{Cl}}\left[\mathrm{NPF}_{2}\right]_{\mathrm{n}}+4 \mathrm{nHF} \quad[\mathrm{n}=3,4,5 ]

(a) (i) and (iii)
(b) (i) and (ii)
(c) (i) only

(d) (iii) only MAIN GROUPS ELEMENTS

1.	(b)	2.	(a)	3.	(a)	4.	(a)	5.	(a)	6.	(a)	7.	(b)
8.	(b)	9.	(d)	10.	(a)	11.	(c)	12.	(c)	13.	(b)	14.	(a)
15.	(d)	16.	(c)	17.	(b)	18.	(a)	19.	(d)	20.	(d)	21.	(b)
22.	(b)	23.	(b)	24.	(d)	25.	(d)	26.	(a)	27.	(c)	28.	(c)
29.	(a)	30.	(b)	31.	(d)	32.	(c)	33.	(c)	34.	(d)	35.	(b)
36.	(a)	37.	(c)	38.	(c)	39.	(c)	40.	(a)	41.	(a)	42.	(d)
43.	(d)	44.	(a)	45.	(b)	46.	(c)	47.	(d)	48.	(c)	49.	(c)
50.	(a)	51.	(a)	52.	(a)	53.	(a)	54.	(d)	55.	(c)	56.	(a)
57.	(a)	58.	(b)	59.	(b)	60.	(a)	61.	(a)	62.	(a)	63.	(b)
64.	(c)	65.	(d)	66.	(a)	67.	(a)	68.	(d)	69.	(a)	70.	(c)
71.	(b)	72.	(c)	73.	(a)	74.	(c)	75.	(d)	76.	(b)	77.	(c)
78.	(a)	79.	(b)	80.	(c)	81.	(b)	82.	(a)	83.	(a)	84.	(c)
85.	(b)	86.	(a)	87.	(c)	88.	(c)	89.	(a)	90.	(c)	91.	(a)
92.	(a)	93.	(b)	94.	(d)	95.	(a)	96.	(b)	97.	(a)	98.	(c)
99.	(b)	100.	(d)

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Answer: (d)

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Q4 · 2020 · 2 marks

Correct statement/s among the following with respect to ionization energy (IE) is/are (i) (\mathrm{IE_1 + IE_2 + IE_3}) for indium is more than that of aluminium (ii) \mathrm{IE_1} of scandium is higher than that of cobalt (iii) \mathrm{IE_1} of gallium is lower than that of selenium (iv) \mathrm{IE_1} of nitrogen is greater than that of oxygen

(a) (ii) and (iv)
(b) (iii) and (iv)
(c) (i) and (iv)
(d) (ii) and (iii)

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Answer: (b)

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Q5 · 2020 · 2 marks

Choose the correct statements for the Group 15 halides: (i)AsCl3 can form complexes of type \left[\mathrm{AsCl}_{4}\right]^{-}in the presence of a chloride source (ii) \mathbf{P F}_{3} acts as a strong a-donor ligand towards d-metals (iii) In the solid state, \mathbf{S b F}_{\mathbf{5}} has a trigonal bipyramidal structure (iv) The reaction of \mathrm{SbF}_{5} with anhydrous HF generates \left[\mathrm{H}_{2} \mathrm{~F}\right]^{+}ions a(i) and (iv) b(ii) , (iii) and (iv) c(i) , (iii) and (iv) d(ii) and (iii)

(a) (i) and (iv)
(b) (ii) , (iii) and (iv)
(c) (i) , (iii) and (iv)
(d) (ii) and (iii)

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Answer: (a)

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Q6 · 2020 · 2 marks

The reaction of \mathrm{XeF_6} with a limited amount of quartz gives compound A. Then on reaction with an equivalent amount of \mathrm{XeO_3}. A gives B. The products A and B are, respectively

(a) \mathrm{XeOF_2} and \mathrm{XeO_2F_2}
(b) \mathrm{XeOF_4} and \mathrm{XeO_2F_2}
(c) \mathrm{XeOF_2} and \mathrm{XeOF_4}
(d) \mathrm{XeO_2F_2} and \mathrm{XeOF_4}

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Answer: (b)

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Q7 · 2020 · 2 marks

The energies of interaction for (i) ion pair, (ii) ion-dipole, and (iii) dipole-dipole interactions are inversely proportional to

(a) r, r^{2} and r^{3} respectively
(b) r^{2}, r and r^{3} respectively
(c) \mathrm{r}, \mathrm{r}^{2} and \mathrm{r}^{6} respectively
(d) r^{2}, r and r^{6} Respectively

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Answer: (a)

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Q8 · 2019 · 2 marks

The correct statements regarding Boron among the following (1) Nuclear spin of { }^{\mathbf{1 1}} \mathbf{B} is greater than that of { }^{\mathbf{1 0}} \mathbf{B} (II) The polarities of B-H bond and C-H bonds are opposite (III) Cross-section of neutron absorption for { }^{\mathbf{1 0}} \mathbf{B} is much more than that of { }^{\mathbf{1 1}} \mathbf{B} (IV) \mathbf{B} reacts with boiling aq. \mathbf{N a O H} solution to form \mathbf{N a B}(\mathbf{O H})_{4} Are

(a) II and III
(b) I and II
(c) III and IV
(d) II and IV

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Answer: (a)

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Q9 · 2019 · 2 marks

Choose the correct statement(s) among the following (I) LiF is more soluble than \mathrm{LiClO_4} in water. (II) The standard reduction potential [E^\circ] of Li is more negative than that of Na (III) The heat of hydration of \mathrm{Li^+(g)} is greater than that of \mathrm{Na^+(g)}

(a) I and II
(b) I and III
(c) II and III
(d) III Only

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Answer: (c)

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Q10 · 2019 · 2 marks

The oxidation state of sulphur in the dithionous and dithionic acids, respectively, are

(a) +4, +6
(b) - 4,+5
(c) +3, +5
(d) +3,+6

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Answer: (c)

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Q11 · 2019 · 2 marks

In the synthesis of polydimethylsiloxane, the chain forming, branching and terminating agents respectively, are

(a) \mathrm{Me}_{2} \mathrm{SiCl}_{2}, \mathrm{Me}_{3} \mathrm{SiCl} and \mathrm{MeSiCl}_{3}
(b) \mathrm{Me}_{2} \mathrm{SiCl}_{2}, \mathrm{MeSiCl}_{3} and \mathrm{Me}_{3} \mathrm{SiCl}
(c) \mathrm{MeSiCl}_{3}, \mathrm{Me}_{2} \mathrm{SiCl}_{2} and \mathrm{Me}_{3} \mathrm{SiCl}
(d) \mathrm{Me}_{2} \mathrm{SiCl}_{2}, \mathrm{MeSiCl}_{3} and \mathrm{Me}_{4} \mathrm{Si}

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Answer: (b)

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Q12 · June 2019 · 2 marks

The correct statements regarding Boron among the following (1) Nuclear spin of { }^{11} \mathrm{~B} is greater than that of { }^{10} \mathrm{~B} (II) The polarities of B-H bond and C-H bonds are opposite (III) Cross-section of neutron absorption for { }^{10} \mathrm{~B} is much more than that of { }^{11} \mathrm{~B} (IV) B reacts with boiling aq. NaOH solution to form \mathrm{NaB}(\mathrm{OH})_{4}

(a) II and III
(b) I and II
(c) III and IV
(d) II and IV

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Answer: (a)

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Q13 · June 2019 · 2 marks

Choose the correct statement(s) among the following (I) LiF is more soluble than \mathrm{LiClO}_{4} in water. (II) The standard reduction potential [E { }^{0} ] of Li is more negative than that of Na (III) The heat of hydration of \mathrm{Li}^{+}(\mathrm{g}) is greater than that of \mathrm{Na}^{+}(\mathrm{g})

(a) I and II
(b) I and III
(c) II and III
(d) III Only

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Answer: (c)

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Q14 · 2019 · 2 marks

Choose the correct statement(s) among the following (1) The dihedral angle in \mathrm{O}_{2} \mathrm{~F}_{2} is 0^{0}. (II) \mathrm{OF}_{2} is generally prepared by reacting fluorine gas with dilute (2\%) aq. NaOH solution (III) \mathrm{O}_{2} \mathrm{~F}_{2} can be readily reduced by \mathrm{H}_{2} \mathrm{~S}.

(a) I and II only
(b) I, II and III
(c) II and III only
(d) II only

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Answer: (c)

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Q15 · 2019 · 2 marks

The correct statements for dithionite and dithionate anions from the following are

(a) both have S-S bond
(b) both are dianionic
(c) oxidation state of sulphur is +3 and +5 , respectively
(d) sulphur in dithionate has lone pair of electrons (1)A, B and C (2)A, B and D (3)B, C and D (4)A and B only

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Answer: (a)

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Q16 · Dec 2019 · 2 marks

Choose the correct statements for the Group 15 halides: (i) \mathrm{AsCl}_{3} can form complexes of type \left[\mathrm{AsCl}_{4}\right]^{-}in the presence of a chloride source (ii) \mathrm{PF}_{3} acts as a strong a-donor ligand towards d-metals (iii) In the solid state, \mathrm{SbF}_{5} has a trigonal bipyramidal structure (iv) The reaction of \mathrm{SbF}_{5} with anhydrous HF generates \left[\mathrm{H}_{2} \mathrm{~F}\right]^{+}Ion

(a) (i) and (iv)
(b) (ii), (iii) and (iv)
(c) (i) , (iii) and (iv)
(d) (ii) and (iii)

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Answer: (a)

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Q17 · Dec 2019 · 2 marks

The reaction of \mathrm{XeF}_{6} with a limited amount of quartz gives compound A . Then on reaction with an equivalent amount of \mathrm{XeO}_{3}. A gives B. The products A and B are, respectively

(a) \mathrm{XeOF}_{2} and \mathrm{XeO}_{2} \mathrm{~F}_{2}
(b) \mathrm{XeOF}_{4} and \mathrm{XeO}_{2} \mathrm{~F}_{2}
(c) \mathrm{XeOF}_{2} and \mathrm{XeOF}_{4}
(d) \mathrm{XeO}_{2} \mathrm{~F}_{2} and \mathrm{XeOF}_{4}

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Answer: (b)

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Q18 · 2018 · 2 marks

The reaction of decaborane \mathrm{B_{10}H_{14}}, with acetylene in the presence of \mathrm{Et_2S} gives

(a) \mathrm{C_2B_{10}H_{12}}
(b) \mathrm{C_2B_8H_{10}}
(c) \mathrm{C_2B_{10}H_{14}}
(d) \mathrm{C_2B_9H_{11}}

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Answer: (a)

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Q19 · June 2018 · 2 marks

The structure of \mathrm{CaB}_{6} is close to that of

(a) Cesium chloride
(b) Nickel arsenide
(c) Rock salt
(d) Zinc blende

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Answer: (a)

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Q20 · 2018 · 2 marks

Consider the following statements for \mathrm{Be}_{2} \mathrm{Cl}_{4} (I), \mathrm{B}_{2} \mathrm{Cl}_{4} (II) and \mathrm{Ga}_{2} \mathrm{Cl}_{4} (III):

(a) There is an \mathbf{M}-\mathbf{M}(\mathbf{M}=\mathbf{B e}, \mathbf{B}, \mathbf{G a}) bond in all.
(b) The oxidation state of \mathrm{Be}, \mathrm{B} and Ga is +2 .
(c) The geometry around the central atom is planar for all.
(d) The geometry around the central atom is planar in I and II only.

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Answer: (c)

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Q21 · Dec 2018 · 2 marks

The reaction of decaborane \mathrm{B}_{10} \mathrm{H}_{14}, with acetylene in the presence of \mathrm{Et}_{2} \mathrm{~S} gives

(a) \mathrm{C}_{2} \mathrm{~B}_{10} \mathrm{H}_{12}
(b) \mathrm{C}_{2} \mathrm{~B}_{8} \mathrm{H}_{10}
(c) \mathrm{C}_{2} \mathrm{~B}_{10} \mathrm{H}_{14}
(d) \mathrm{C}_{2} \mathrm{~B}_{9} \mathrm{H}_{11}

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Answer: (a)

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Q22 · 2018 · 2 marks

In compound \mathrm{N}_{3} \mathrm{P}_{3} \mathrm{~F}_{6}, the geometry around nitrogen and phosphorus, respectively, are

(a) pyramidal and tetrahedral
(b) planar and tetrahedral
(c) pyramidal and planar
(d) planar and trigonal bipyramidal

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Answer: (b)

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Q23 · 2017 · 2 marks

Both potassium and sulfuric acid form intercalation compounds with graphite. The graphite layers are

(a) reduced in both the cases
(b) oxidized in both the cases
(c) oxidized in the case of potassium and reduced in the case of sulphuric acid
(d) reduced in the case of potassium and oxidized in the case of sulphuric acid

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Answer: (d)

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Q24 · 2017 · 2 marks

Addition of two electrons to the bismuth cluster \mathrm{Bi}_{5}{ }^{+3} results in a change of structure type from

(a) closo to nido
(b) nido to arachno
(c) closo to arachno
(d) arachno to hypho

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Answer: (a)

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Q25 · 2017 · 2 marks

The compound \mathrm{N}_{2} \mathrm{~F}_{2} has two isomers. Choose the correct option from the following:

(a) both isomers possess a \sigma_{\mathrm{v}} plane
(b) both isomers possess \sigma_{h} plane
(c) one isomer has a \sigma_{h} plane while the other has a \sigma_{v} plane
(d) none of them have a \sigma_{b} plane

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Answer: (c)

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Q26 · 2017 · 2 marks

The first ionization energy is the lowest for

(a) Br
(b) Se
(c) P
(d) As

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Answer: (b)

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Q27 · 2017 · 2 marks

Choose the incorrect statement for the phosphomolybdate anion \left[\mathrm{PMO}_{12} \mathrm{O}_{40}\right]^{-3}

(a) It has a Keggin structure.
(b) Phosphorus is in +5 oxidation state.
(c) It is extremely basic.
(d) It forms crystalline precipitates with \left[\mathrm{R}_{4} \mathrm{~N}\right]^{+}( \mathrm{R}= bulky alkyl or aryl group)

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Answer: (c)

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Q28 · 2016 · 2 marks

The metal iodide with metallic lustre and high electrical conductivity is

(b) \mathrm{CdI_2}
(c) \mathrm{LaI_2}
(d) \mathrm{BiI_3}

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Answer: (c)

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Q29 · 2016 · 2 marks

The numbers of P-S and P-P bonds in the compound \mathrm{P}_{4} \mathrm{~S}_{3} are, respectively

(a) 6 and 3
(b) 4 and 3
(c) 3 and 6
(d) 6 and 2

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Answer: (a)

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Q30 · Dec 2016 · 2 marks

The metal iodide with metallic lustre and high electrical conductivity is

(a) NaI
(b) \mathrm{CdI}_{2}
(c) \mathrm{LaI}_{2}
(d) \mathrm{BiI}_{3}

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Answer: (c)

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Q31 · 2016 · 2 marks

Among the following, choose the correct products that are formed in the reaction of \mathrm{S}_{2} \mathrm{Cl}_{2} with ammonia in \mathrm{CCl}_{4} \mathrm{NH}_{4} \mathrm{Cl}(\mathrm{A}), \mathrm{S}_{4} \mathrm{~N}_{4}(\mathrm{~B}), \mathrm{S}_{8}(\mathrm{C}), and \mathrm{S}_{3} \mathrm{~N}_{3} \mathrm{Cl}_{3}(\mathrm{D}).

(a) A, B and C
(b) A, B and D
(c) B, C and D
(d) A, C and D

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Answer: (a)

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Q32 · 2016 · 2 marks

The final product(s) of the reaction of arachno borane, \mathrm{B}_{4} \mathrm{H}_{10} with \mathrm{NMe}_{3} is/are

(a) \left[\mathrm{BH}_{3} . \mathrm{NMe},\right] and \left[\mathrm{B}_{3} \mathrm{H}_{7} . \mathrm{NMe}_{3}\right]
(b) \left[\mathrm{BH}_{2}\left(\mathrm{NMe}_{3}\right)_{2}\right]^{+}\left[\mathrm{B}_{3} \mathrm{H}_{8}\right]^{-}
(c) \left[\mathrm{B}_{4} \mathrm{H}_{10} . \mathrm{NMe}_{3}\right]
(d) \left[\mathrm{B}_{4} \mathrm{H}_{10} . \mathrm{NMe}_{3}\right] and \left[\mathrm{BH}_{2}\left(\mathrm{NMe}_{3}\right)_{2}\right]^{+}\left[\mathrm{B}_{3} \mathrm{H}_{8}\right]^{-}

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Answer: (a)

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Q33 · 2015 · 2 marks

Consider the following reaction :

\mathrm{N_3P_3Cl_6 + 6HNMe_2 \rightarrow \underset{[A]}{N_3P_3Cl_3(NMe_2)_3} + 3\,Me_2NH \cdot HCl}

The number of possible isomers for [A] is

(a) 4
(b) 3
(c) 2
(d) 5

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Answer: (b)

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Q34 · June 2015 · 2 marks

The correct set of pseudo halide anions is

(a) \mathrm{CN}^{-}, \mathrm{ClO}_{4}{ }^{-}, \mathrm{BF}_{4}{ }^{-}, \mathrm{PF}_{6}{ }^{-}
(b) \mathrm{SCN}^{-}, \mathrm{PO}_{4}^{-3}, \mathrm{H}_{2} \mathrm{PO}_{4}^{-}, \mathrm{N}_{3}^{-}
(c) \mathrm{N}^{-}{ }_{3}, \mathrm{NO}_{3}^{-}, \mathrm{HSO}_{4} \mathrm{AsF}_{6}^{-}
(d) \mathrm{CN}^{-}, \mathrm{N}_{3}{ }^{-}, \mathrm{SCN}^{-}, \mathrm{NCN}^{2-}

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Answer: (d)

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Q35 · 2014 · 2 marks

The oxoacid of phosphorus having P atoms in +4,+3, and +4 oxidation states respectively, is

(a) \mathrm{H}_{5} \mathrm{P}_{3} \mathrm{O}_{10}
(b) \mathrm{H}_{5} \mathrm{P}_{3} \mathrm{O}_{7}
(c) \mathrm{H}_{5} \mathrm{P}_{3} \mathrm{O}_{8}
(d) \mathrm{H}_{5} \mathrm{P}_{3} \mathrm{O}_{9}

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Answer: (c)

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Q36 · Dec 2015 · 2 marks

Consider the following reaction :

\mathrm{N_3P_3Cl_6 + 6HNMe_2 \rightarrow N_3P_3Cl_3(NMe_2)_3 + 3\,Me_2NH.HCl}\quad [A]

The number of possible isomers for [A] is

(a) 4
(b) 3
(c) 2
(d) 5

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Answer: (b)

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Q37 · 2015 · 2 marks

The reaction of \mathrm{BCl}_{3}, with \mathrm{NH}_{4} \mathrm{Cl} gives product A which upon reduction by \mathrm{NaBH}_{4} gives product B . Product B upon reacting with HCI affords compound C , which is

(a) \mathrm{Cl}_{3} \mathrm{~B}_{3} \mathrm{~N}_{3} \mathrm{H}_{9}
(b) [\mathrm{ClBNH}]_{3}
(c) [\mathrm{HBNH}]_{3}
(d) (\mathrm{ClH})_{3} \mathrm{~B}_{3} \mathrm{~N}_{3}(\mathrm{ClH})_{3}

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Answer: (a)

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Q38 · 2015 · 2 marks

Protonated form of ZSM-5 catalyzes the reaction of ethene with benzene to produce ethylbenzene. The correct statement for this catalytic process is

(a) alkyl carbocation is formed
(b) carbanion is formed
(c) benzene converted to \left(\mathrm{C}_{6} \mathrm{H}_{5}\right)^{+}group
(d) vinyl radical is formed

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Answer: (a)

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Q39 · 2014 · 2 marks

Chromite ore on fusion with sodium carbonate gives

(a) \mathrm{Na_2CrO_4} and \mathrm{Fe_2O_3}
(b) \mathrm{Na_2Cr_2O_7} and \mathrm{Fe_2O_3}
(c) \mathrm{Cr_2(CO_3)_3} and \mathrm{Fe(OH)_3}
(d) \mathrm{Na_2CrO_4} and \mathrm{Fe_2(CO_3)_3}

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Answer: (a)

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Q40 · 2014 · 2 marks

The correct set of pseudo halide anions is

(a) \mathrm{CN^-, ClO_4^-, BF_4^-, PF_6^-}
(c) \mathrm{SCN^-, PO_4^{-3}, H_2PO_4^-, N_3^-}
(b) \mathrm{N_3^-, NO_3^-, HSO_4^{-}, AsF_6^-}
(d) \mathrm{CN^-, N_3^-, SCN^-, NCN^{2-}}

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Answer: (d)

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Q41 · June 2014 · 2 marks

Reactions of elemental as with hot and conc. \mathrm{HNO}_{3}, and \mathrm{H}_{2} \mathrm{SO}_{4} respectively, give

(a) \mathrm{As}_{4} \mathrm{O}_{6} and \mathrm{As}_{2}\left(\mathrm{SO}_{4}\right)_{3}
(b) \mathrm{As}\left(\mathrm{NO}_{3}\right)_{5} and \mathrm{As}_{2}(\mathrm{SO})_{3}
(c) \mathrm{As}_{4} \mathrm{O}_{6} and \mathrm{H}_{3} \mathrm{AsO}_{4}
(d) \mathrm{H}_{3} \mathrm{AsO}_{4} and \mathrm{As}_{4} \mathrm{O}_{6}

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Answer: (d)

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Q42 · June 2014 · 2 marks

Chromite ore on fusion with sodium carbonate gives

(a) \mathrm{Na}_{2} \mathrm{CrO}_{4} and \mathrm{Fe}_{2} \mathrm{O}_{3}
(b) \mathrm{Na}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7} and \mathrm{Fe}_{2} \mathrm{O}_{3}
(c) \mathrm{Cr}_{2}\left(\mathrm{CO}_{3}\right) 3 and \mathrm{Fe}(\mathrm{OH})_{3}
(d) \mathrm{Na}_{2} \mathrm{CrO}_{4} and \mathrm{Fe}_{2}\left(\mathrm{CO}_{3}\right)_{3}

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Answer: (a)

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Q43 · 2014 · 2 marks

The correct order of decreasing electronegativity of the following atoms is,

(a) \mathrm{As}>\mathrm{Al}>\mathrm{Ca}>\mathrm{S}
(b) \mathrm{S}> As >\mathrm{Al}>\mathrm{Ca}
(c) \mathrm{Al}>\mathrm{Ca}>\mathrm{S}>\mathrm{As}
(d) \mathrm{S}>\mathrm{Ca}>\mathrm{As}>\mathrm{Al}

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Answer: (b)

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Q44 · 2014 · 2 marks

The correct order of the size of \mathrm{S}, \mathrm{S}^{2-}, \mathrm{S}^{2+} and \mathrm{S}^{4+} species is,

(a) \mathrm{S}>\mathrm{S}^{2+}>\mathrm{S}^{4+}>\mathrm{S}^{2-}
(b) \mathrm{S}^{2+}>\mathrm{S}^{4+}>\mathrm{S}^{2-}>\mathrm{S}
(c) \mathrm{S}^{2-}>\mathrm{S}>\mathrm{S}^{2+}>\mathrm{S}^{4+}
(d) \mathrm{S}^{4+}>\mathrm{S}^{2-}>\mathrm{S}>\mathrm{S}^{2+}

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Answer: (c)

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Q45 · 2014 · 2 marks

The reaction between \mathrm{SbF}_{5} and two equivalents of HF leads to the formation of

(a) \mathrm{H}_{2} \mathrm{SbF}_{3}+2 \mathrm{~F}_{2}
(b) \mathrm{HSbF}_{2}+3 \mathrm{~F}_{2}
(c) \mathrm{SbF}_{3}+\mathrm{H}_{2}+2 \mathrm{~F}_{2}
(d) \left[\mathrm{SbF}_{6}\right]^{-}\left[\mathrm{H}_{2} \mathrm{~F}\right]^{+}

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Answer: (d)

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Q46 · 2014 · 2 marks

Among \mathrm{F}-, \mathrm{Na}^{+}, \mathrm{O}^{2-} and \mathrm{Mg}^{2+} ions, those having the highest and the lowest ionic radii respectively are

(a) \mathrm{O}^{2-} and \mathrm{Na}^{+}
(b) \mathrm{F}^{-}and \mathrm{Mg}^{2+}
(c) \mathrm{O}^{2-} and \mathrm{Mg}^{2+}
(d) \mathrm{Mg}^{2+} and \mathrm{O}^{2-}

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Answer: (c)

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Q47 · 2014 · 2 marks

A borane (X) is reacted with ammonia to give a salt of borohydride (Y). The { }^{11} \mathrm{~B} NMR spectrum of Y consists of a triplet and a quintet. The borane X is

(a) \mathrm{B}_{2} \mathrm{H}_{6}
(b) \mathrm{B}_{3} \mathrm{H}_{9}
(c) \mathrm{B}_{4} \mathrm{H}_{8}
(d) \mathrm{B}_{5} \mathrm{H}_{9}

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Answer: (a)

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Q48 · 2014 · 2 marks

The main products of the reaction of equimolar quantities of \mathrm{XeF}_{6} with \mathrm{NaNO}_{3} are

(a) \mathrm{XeOF}_{4}, \mathrm{NaF} and \mathrm{NO}_{2} \mathrm{~F}
(b) \mathrm{XeO}_{2} \mathrm{~F}_{2}, \mathrm{NaF}, \mathrm{NOF} and \mathrm{F}_{2}
(c) \mathrm{XeOF}_{4}, \mathrm{NaNO}_{2} and \mathrm{F}_{2}
(d) \mathrm{XeF}_{4}, \mathrm{NaNO}_{2}, and \mathrm{F}_{2} \mathrm{O}

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Answer: (a)

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Q49 · 2013 · 2 marks

The reaction of \mathrm{FeCl_3 \cdot 6H_2O} with \mathrm{SOCl_2} yields.

(a) \mathrm{FeCl_2} (s), \mathrm{SO_2} (g) and HCl (g)
(b) \mathrm{FeCl_3}(s), \mathrm{SO_2}(g) and HCl(l)
(c) \mathrm{FeCl_2} (S), \mathrm{SO_2}(s) and HCl (g)
(d) \mathrm{FeCl_3}(s), \mathrm{SO_2}(g) and HCl(g)

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Answer: (d)

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Q50 · 2013 · 2 marks

Commonly used scintillator for measuring radiation is

(a) NaI(Al)
(b) NaI(Tl)
(c) CsI(Tl)
(d) CsI(Al)

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Answer: (b)

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Q51 · 2013 · 2 marks

Number of isomeric derivatives possible for the neutral closo-carborane, \mathrm{C_2B_{10}H_{12}} is

(a) three
(b) two
(c) four
(d) six

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Answer: (a)

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Q52 · June 2013 · 2 marks

Which of the following pairs has the highest difference in their first ionization energy?

(a) Xe, Cs
(b) Kr, Rb
(c) Ar, K
(d) Ne, Na

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Answer: (d)

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Q53 · June 2013 · 2 marks

Which of the following is used as propellant for whipping creams?

(a) \mathrm{N}_{2} \mathrm{O}
(b) NO
(c) \mathrm{N}_{2} \mathrm{O}_{3}
(d) \mathrm{N}_{2} \mathrm{O}_{5}

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Answer: (a)

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Q54 · June 2013 · 2 marks

Flame proof fabrices contain

(a) \mathrm{H}_{2} \mathrm{NC}(\mathrm{O}) \mathrm{NH}_{2} . \mathrm{Na}_{2} \mathrm{SO}_{4}
(b) \mathrm{H}_{2} \mathrm{NC}(\mathrm{S}) \mathrm{NH}_{2} \cdot \mathrm{Na}_{2} \mathrm{SO}_{4}
(c) \mathrm{H}_{2} \mathrm{NC}(\mathrm{O}) \mathrm{NH}_{2} . \mathrm{H}_{3} \mathrm{PO}_{4}
(d) \mathrm{H}_{2} \mathrm{NC}(\mathrm{S}) \mathrm{NH}_{2} \cdot \mathrm{H}_{3} \mathrm{PO}_{4}

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Answer: (c)

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Q55 · June 2013 · 2 marks

Among the oxides of nitrogen, \mathrm{N}_{2} \mathrm{O}_{3}, \mathrm{~N}_{2} \mathrm{O}_{4}, and \mathrm{N}_{2} \mathrm{O}_{5} the compound(s) having N - N bond is/are

(a) \mathbf{N}_{\mathbf{2}} \mathbf{O}_{\mathbf{4}} and \mathbf{N}_{\mathbf{2}} \mathbf{O}_{\mathbf{5}}
(b) \mathrm{N}_{2} \mathrm{O}_{3} and \mathrm{N}_{2} \mathrm{O}_{5}
(c) \mathrm{N}_{2} \mathrm{O}_{3} and \mathrm{N}_{2} \mathrm{O}_{4}
(d) \mathrm{N}_{2} \mathrm{O}_{5} only

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Answer: (c)

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Q56 · June 2013 · 2 marks

Identify the pairs in which the covalent radii of elements are almost similar

(a) Nb, Ta A and B only
(b) Mo, W A and C only
(c) La, Lu B and C only
(d) Sc, Y A, B and C only

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Answer: (a)

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Q57 · June 2013 · 2 marks

The correct equilibrium order for the interconversion of different forms of \mathrm{SiO}_{2} is

(a) Tridymite ↔ quartz ↔cristobalite ↔ liquid \mathrm{SiO}_{2}
(b) quartz ↔Tridymite \leftrightarrow cristobalite \leftrightarrow liquid \mathrm{SiO}_{2}
(c) quartz ↔ cristobalite ⟷ tridymite ⟷liquid \mathrm{SiO}_{2}
(d) cristobalite ↔ tridymite ↔ quartz ⇆liquid \mathrm{SiO}_{2}

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Answer: (b)

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Q58 · 2013 · 2 marks

Treatment of \mathrm{ClF}_{3} with \mathrm{SbF}_{5} leads to the formation of a/an

(a) polymeric material
(b) covalent cluster
(c) ionic compound
(d) lewis acid-base adduct

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Answer: (c)

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Q59 · 2013 · 2 marks

The reason for the chemical inertness of gaseous nitrogen at room temperature is best given

(a) high bonding energy only
(b) electronic configuration
(c) HOMO-LUMO gap only
(d) high bond energy and HOMO-LUMO gap.

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Answer: (d)

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Q60 · Dec 2013 · 2 marks

Commonly used scintillator for measuring radiation is

(a) \mathrm{Nal}(\mathrm{AI})
(b) \mathrm{NaI}(\mathrm{TI})
(c) CsI(TI)
(d) Csl(AI)

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Answer: (b)

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Q61 · Dec 2013 · 2 marks

In a specific reaction, hexachlorocyclotriphosphazene, \mathrm{N_3P_3Cl_6} was reacted with a metal fluoride to obtain mixed halo derivatives namely \mathrm{N_3P_3Cl_3F} (A), \mathrm{N_3P_3Cl_4F} (B), \mathrm{N_3P_3Cl_3F_3} (C), \mathrm{N_3P_3Cl_2F_4} (D), \mathrm{N_3P_3ClF_5} (E). Compositions among these which can give isomeric products are

(d) E, A and B
(a) A, B and C
(b) B, C and D
(c) C, D and E

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Answer: (c)

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Q62 · Dec 2013 · 2 marks

Number of isomeric derivatives possible for the neutral closo-carborane, \mathrm{C}_{2} \mathrm{~B}_{10} \mathrm{H}_{12} is

(a) three
(b) two
(c) four
(d) six

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Answer: (a)

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Q63 · 2013 · 2 marks

For higher boranes 3c-2e 'BBB' bond may be a part of their structures. In \mathrm{B}_{5} \mathrm{H}_{9}, the number of such electron deficient bond(s) present is/are

(a) four
(b) two
(c) zero
(d) one

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Answer: (d)

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Q64 · 2012 · 2 marks

Structure of a carborane with formula, \mathrm{C_2B_4H_8}, is formally derived from

(a) Closo-borane
(b) Nido-borane
(c) Arachno-borane
(d) Conjuncto-borane

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Answer: (b)

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Q65 · 2012 · 2 marks

Boric acid is a weak acid in aqueous solution. But its acidity increases significantly in the presence of ethylene glycol, because

(a) ethylene glycol releases additional \mathrm{H^+}
(b) \mathrm{B(OH)_4^-} is consumed in forming a compound with ethylene glycol.
(c) ethylene glycol neutralizes \mathrm{H^+} released by boric acid.
(d) Boric acid dissociates better in the mixed-solvent.

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Answer: (b)

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Q66 · 2012 · 2 marks

Among the halides, \mathrm{NCl}_{3}(\mathrm{~A}), \mathrm{PCl}_{3}(\mathrm{~B}) and \mathrm{AsCl}_{3}(\mathrm{C}), those which produce two different acids.

(a) A and B
(b) A and C
(c) B and C
(d) A, B and C

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Answer: (c)

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Q67 · 2012 · 2 marks

The most used acid catalyst in oil industry and the relevant process are respectively

(a) Alumino phosphate and reforming
(b) Alumino silicate and cracking
(c) Alumino silicate and reforming
(d) Alumino phosphate and cracking.

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Answer: (b)

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Q68 · 2012 · 2 marks

For the deposition of Pb by electroplating, the best suited compound among the following is

(a) \mathrm{PbCl}_{2}
(b) \mathrm{PbSO}_{4}
(c) \mathrm{Pb}(\mathrm{Et})_{4}
(d) \mathrm{Pb}\left(\mathrm{BF}_{4}\right)_{2}

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Answer: (d)

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Q69 · 2012 · 2 marks

The electronegativity differences is the highest for the pair

(a) Li, Cl
(b) K, F
(c) Na, Cl
(d) Li, F

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Answer: (b)

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Q70 · Dec 2012 · 2 marks

Structure of a carborane with formula, \mathrm{C}_{2} \mathrm{~B}_{4} \mathrm{H}_{8}, is formally derived from

(a) Closo-borane ethylene glycol releases additional \mathrm{H}^{+}
(b) Nido-borane \mathrm{B}(\mathrm{OH})_{4}^{-}is consumed in forming a compound with ethylene glycol.
(c) Arachno-borane ethylene glycol neutralizes \mathrm{H}^{+}released by boric acid.
(d) Conjuncto-borane 3 ethylene glycol, because Boric acid dissociates better in the mixed-solvent.

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Answer: (b)

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Q71 · Dec 2012 · 2 marks

Boric acid is a weak acid in aqueous solution. But its acidity increases significantly in the presence of ethylene glycol, because

(a) ethylene glycol releases additional \mathrm{H}^{+}
(b) \mathrm{B}(\mathrm{OH})_{4}^{-} is consumed in forming a compound with ethylene glycol.
(c) ethylene glycol neutralizes \mathrm{H}^{+} released by boric acid.
(d) Boric acid dissociates better in the mixed-solvent.

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Answer: (b)

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Q72 · 2012 · 2 marks

Silicates with continuous 3D frame work are

(a) Neso-silicates
(b) Soro-silicates
(c) Phyllo-silicates
(d) Tecto-silicates

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Answer: (d)

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Q73 · 2011 · 2 marks

Lewis acidity of \mathrm{BCl_3}, \mathrm{BPh_3} and \mathrm{BMe_3} with respect to pyridine follows the order

(a) \mathrm{BCl_3} > \mathrm{BPh_3} > \mathrm{BMe_3}
(b) \mathrm{BMe_3} > \mathrm{BPh_3} > \mathrm{BCl_3}
(c) \mathrm{BPh_3} > \mathrm{BMe_3} > \mathrm{BCl_3}
(d) \mathrm{BCl_3} > \mathrm{BMe_3} > \mathrm{BPh_3}

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Answer: (a)

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Q74 · 2011 · 2 marks

Bayer's process involves.

(a) Synthesis of \mathrm{B_2H_6} from \mathrm{NaBH_4}
(b) Synthesis of \mathrm{NaBH_4} from borax
(c) Synthesis of \mathrm{NaBH_4} from \mathrm{B_2H_6}
(d) Synthesis of \mathrm{B_3N_3H_6} from \mathrm{B_2H_6}

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Answer: (b)

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Q75 · 2011 · 2 marks

Alkali metal superoxides are obtained by the reaction of

(a) Oxygen with alkali metals in liquid ammonia.
(b) Water with alkali metals in liquid ammonia
(c) \mathrm{H}_{2} \mathrm{O}_{2} with alkali metals.
(d) \mathrm{H}_{2} \mathrm{O}_{2} with alkali metals in liquid ammonia.

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Answer: (a)

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Q76 · 2011 · 2 marks

The correct statement regarding closo- \{\mathrm{BnHn}\} species is:

(a) it always has-2 charge
(b) it always has +2 charge.
(c) it is a neutral species
(d) it is more reactive than nido, arachno, and hypo-boranes

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Answer: (a)

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Q77 · Dec 2011 · 2 marks

Lewis acidity of \mathrm{BCl}_{3}, \mathrm{BPh}_{3} and \mathrm{BMe}_{3} with respect to pyridine follows the order

(a) \mathrm{BCl}_{3}>\mathrm{BPh}_{3}>\mathrm{BMe}_{3}
(b) \mathrm{BMe}_{3}>\mathrm{BPh}_{3}>\mathrm{BCl}_{3}
(c) \mathrm{BPh}_{3}>\mathrm{BMe} 3>\mathrm{BCl}_{3}
(d) \mathrm{BCl}_{3}>\mathrm{BMe}_{3}>\mathrm{BPh}_{3}

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Answer: (a)

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Q78 · 2011 · 2 marks

Among the following pairs (1) oxygen-sulfur (2) nitrogen -phosphorus (3) phosphorus arsenic (4) chlorine- iodine Those in which the first ionization energies differ by more than 300 kJ mole are:

(a) (1) and (3) only
(b) (1) and (2) only
(c) (2) and (3) only
(d) (3) and (4) only

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Answer: (b)

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Q79 · 2011 · 2 marks

The reaction between \mathrm{NH}_{4} \mathrm{Br} and Na metal in liquid ammonia (solvent) results in the products

(a) NaBr, HBr
(b) \mathrm{NaBr}, \mathrm{H}_{2}
(c) \mathrm{H}_{2}, \mathrm{HBr}
(d) \mathrm{HBr}, \mathrm{H}_{2}

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Answer: (b)

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Q80 · 2011 · 2 marks

The material that exhibits the highest electrical conductivity among the following sulfur - nitrogen compounds is

(a) \mathrm{S}_{4} \mathrm{~N}_{4}
(b) \mathrm{S}_{7} \mathrm{NH}
(c) \mathrm{S}_{2} \mathrm{~N}_{2}
(d) (\mathrm{SN})_{\mathrm{x}}

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Answer: (d)

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Q81 · 2011 · 2 marks

The final product (s) of the reaction \mathrm{P}(\mathrm{OR})_{3}+\mathrm{R}^{\prime} \mathrm{X} is/are

(a) \mathrm{R}^{\prime} \mathrm{PO}(\mathrm{OR})_{2} and RX
(b) \left[\mathrm{R}^{\prime} \mathrm{PO}(\mathrm{OR})_{2}\right] \mathrm{X}
(c) \left[\mathrm{R}^{\prime} \mathrm{RPO}_{2}(\mathrm{OR})\right] \mathrm{X}
(d) ROR'and \mathrm{P}(\mathrm{OR})_{2} \mathrm{X}

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Answer: (a)

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Q82 · 2011 · 2 marks

A Sodalite cage in zeolites is

(a) a truncated tetrahedron
(b) an icosahedron
(c) a truncated octahedron
(d) a dodecahedron

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Answer: (c)

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Q83 · 2011 · 2 marks

The styx code of \mathrm{B}_{4} \mathrm{H}_{10} is:

(a) 4120
(b) 4220
(c) 4012
(d) 3203

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Answer: (c)

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Q84 · Dec 2011 · 2 marks

Bayer's process involves.

(a) Synthesis of \mathrm{B}_{2} \mathrm{H}_{6} from \mathrm{NaBH}_{4}
(b) Synthesis of NaBH4 from borax
(c) Synthesis of \mathrm{NaBH}_{4} from \mathrm{B}_{2} \mathrm{H}_{6}
(d) Synthesis of \mathrm{B}_{3} \mathrm{~N}_{3} \mathrm{H}_{6} from \mathrm{B}_{2} \mathrm{H}_{6} 2 14 The correct structure of beryllium nitrate is :

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Answer: (b)

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