Inorganic Chemistry

CSIR NET Chemical Science — Chemical Bonding previous year questions

53 questions · 2011–2019 · all with verified answer · last checked 2026-11-06

Q1 · Dec 2019 · 2 marks

Consider the following statements for Allred-Rochow electronegativity (\chiAR): (i) \chiAR is directly proportional to Z_{\mathrm{eff}} (ii) \chiAR is inversely proportional to Z_{\mathrm{eff}} (iii) \chiAR is inversely proportional to r(covalent). (iv) \chiAR is inversely proportional to r^2(covalent). The correct statements are

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

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Answer: (a)

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Q2 · June 2019 · 2 marks

\mathrm{O}_{2}^{-} is

(a) having a shorter \mathrm{O}-\mathrm{O} bond length than that in \mathrm{O}_{2}
(b) a stronger oxidising agent than \mathrm{O}_{2}
(c) IR active
(d) unable to abstract proton from weak acids

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Answer: (b)

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Q3 · June 2019 · 2 marks

Among the following, the correct statement about \pi-molecular orbitals ( \pi-MOs) of benzene is

(a) Only the lowest energy MO is doubly degenerate
(b) Only LUMO is doubly degenerate
(c) Only HOMO is doubly degenerate
(d) Both the HOMO and LUMO are doubly degenerate.

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Answer: (d)

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Q4 · Dec 2019 · 2 marks

The ion having the highest bond order is

(a) \mathrm{NO}^{+} \mathrm{NF}_{3}>\mathrm{SbF}_{3}>\mathrm{SbCl}_{3}
(b) \mathrm{O}_{2}^{+} \mathrm{SbCl}_{3}>\mathrm{SbF}_{3}>\mathrm{NF}_{3}
(c) \mathrm{N}_{2}^{+} \mathrm{SbF}_{3}>\mathrm{SbCl}_{3}>\mathrm{NF}_{3}
(d) \mathrm{C}_{2}^{+} 8 \mathrm{NF}_{3}>\mathrm{SbCl}_{3}>\mathrm{SbF}_{3}

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Answer: (a)

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Q5 · Dec 2019 · 2 marks

The magnitude of bond angles in gaseous \mathrm{NF}_{3}, \mathrm{SbF}_{3} and \mathrm{SbCl}_{3} follow the order

(a) \mathrm{NF}_{3}>\mathrm{SbF}_{3}>\mathrm{SbCl}_{3}
(b) \mathrm{SbCl}_{3}>\mathrm{SbF}_{3}>\mathrm{NF}_{3}
(c) \mathrm{SbF}_{3}>\mathrm{SbCl}_{3}>\mathrm{NF}_{3}
(d) \mathrm{NF}_{3}>\mathrm{SbCl}_{3}>\mathrm{SbF}_{3}

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Answer: (d)

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Q6 · Dec 2019 · 2 marks

The species for which the shapes (geometry) can be predicted by VSEPR theory is/are

(a) \left[\mathrm{PtCl}_{4}\right]^{2-} A and C
(b) \left[\mathrm{TeCl}_{6}\right]^{2-} B and C
(c) \mathrm{PF}_{3} and \mathrm{SF}_{6} C only
(d) A and B

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Answer: (c)

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Q7 · Dec 2019 · 2 marks

Choose the correct order of energy of 2 \sigma_{\mathrm{g}} and 1 \pi_{0} molecular orbitals for \mathrm{B}_{2}, \mathrm{C}_{2} and \mathrm{O}_{2} :

(a) 2 \sigma_{\mathrm{g}}>1 \pi_{\mathrm{u}} for all the three
(b) 2 \sigma_{\mathrm{g}}>1 \pi_{\mathrm{u}} for \mathrm{B}_{2} and \mathrm{C}_{2} only
(c) 1 \pi_{\mathrm{u}}>2 \sigma_{\mathrm{g}} for \mathrm{C}_{2} and \mathrm{O}_{2} only
(d) 2 \sigma_{g}>1 \pi_{u} for \mathrm{B}_{2} and \mathrm{O}_{2} only

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Answer: (b)

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Q8 · Dec 2019 · 2 marks

Consider the following statements for Allred-Rochow electronegativity (AR): (i) AR is directly proportional to \mathrm{Z}_{\text {eff }} (ii) AR is inversely proportional to \mathrm{Z}_{\text {eff }} (iii) AR is inversely proportional to r(covalent) (iv) AR is inversely proportional to \mathrm{r}^{2} (covalent) The correct statements are

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

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Answer: (a)

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Q9 · Dec 2019 · 2 marks

The total bond order between adjacent carbon atoms of benzene is

(a) 0.5
(b) 2
(c) 1.5
(d) 2.5

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Answer: (c)

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Q10 · June 2018 · 2 marks

Removal of an electron form NO molecule results in

(a) An increase in the \overline{\mathbf{v}} (NO) in the IR spectrum
(b) An EPR active species
(c) Electrons in HOMOs being closer to the oxygen than to nitrogen 2p orbital's
(d) Electrons in HOMOs being closer to the nitrogen than to oxygen 2p orbital's

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Answer: (b)

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Q11 · Dec 2018 · 2 marks

Among \mathrm{SiCl}_{4}, \mathrm{P}(\mathrm{O}) \mathrm{Cl}_{3}, \mathrm{NF}_{3}, trans- \left[\mathrm{SnCl}_{4}(\mathrm{py})_{2}\right] (py-pyridine), those with zero dipole moment are

(a) \mathrm{SiCl}_{4}, and \mathrm{NF}_{3}
(c) \mathrm{SiCl}_{4}, and trans- \mathrm{SnCl}_{4}(\mathrm{py})_{2}
(b) \mathrm{SiCl}_{4}, \mathrm{P}(\mathrm{O}) \mathrm{Cl}_{3}, and trans- \mathrm{SnCl}_{4}(\mathrm{py})_{4}
(d) \mathrm{NF}_{3} and trans- \mathrm{SnCl}_{4}(\mathrm{py})_{2}

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Answer: (c)

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Q12 · Dec 2018 · 2 marks

Arrange the following molecules in order of increasing fundamental vibrational frequencies

(a) \mathrm{O}_{2}^{2-}<\mathrm{O}_{2}^{-}<\mathrm{O}_{2}<\mathrm{O}_{2}^{+}
(b) \mathrm{O}_{2}<\mathrm{O}_{2}^{+}<\mathrm{O}_{2}^{-}<\mathrm{O}_{2}^{2-}
(c) \mathrm{O}_{2}^{2-}<\mathrm{O}_{2}^{-}<\mathrm{O}_{2}^{+}<\mathrm{O}_{2}
(d) \mathrm{O}_{2}^{2+}<\mathrm{O}_{2}<\mathrm{O}_{2}^{-}<\mathrm{O}_{2}^{2+}

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Answer: (a)

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Q13 · Dec 2017 · 2 marks

Among \mathrm{ClO}_{3}, \mathrm{XeO}_{3} and \mathrm{SO}_{3}, species with pyramidal shape is/are?

(a) \mathbf{C l O}_{\mathbf{3}}{ }^{-}and \mathbf{X e O}_{\mathbf{3}}
(b) \mathbf{X e O}_{\mathbf{3}} and \mathbf{S O}_{\mathbf{3}}
(c) \mathbf{C l O}_{\mathbf{3}}{ }^{-}and \mathbf{S O}_{\mathbf{3}}
(d) \mathrm{SO}_{3}

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Answer: (a)

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Q14 · Dec 2017 · 2 marks

Geometries of \mathrm{SNF_3} and \mathrm{XeF_2O_2} respectively, are

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

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Answer: (d)

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Q15 · June 2017 · 2 marks

Based on VSEPR theory, the predicted shapes of \left[\mathrm{XeF}_{5}\right]^{-}and \mathrm{BrF}_{5} respectively, are

(a) pentagonal planar and square pyramidal
(b) square pyramidal and trigonal bipyramidal
(c) trigonal bipyramidal and square pyramidal
(d) square pyramidal and pentagonal planar

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Answer: (a)

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Q16 · Dec 2017 · 2 marks

Among \mathrm{ClO}_{3}, \mathrm{XeO}_{3} and \mathrm{SO}_{3}, species with pyramidal shape is/are?

(a) and \mathrm{XeO}_{3}
(b) \mathrm{XeO}_{3} and \mathrm{SO}_{3}
(c) and \mathrm{SO}_{3}
(d) \mathrm{SO}_{3}

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Answer: (a)

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Q17 · Dec 2017 · 2 marks

Geometries of \mathrm{SNF_3} and \mathrm{XeF_2O_2} respectively, are

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

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Answer: (d)

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Q18 · Dec 2017 · 2 marks

Allred-Rochow electronegativity of an element is

(a) directly proportional to the effective nuclear charge
(b) directly proportional to the covalent radius
(c) inversely proportional to the square of the covalent radius
(d) directly proportional to the square of the effective nuclear charge

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Answer: (b)

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Q19 · Dec 2016 · 2 marks

The oxidation state of gold in the following complex is Structure for this question

(a) 0
(b) 1
(c) 2
(d) 3

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Answer: (c)

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Q20 · Dec 2016 · 2 marks

When a hydrogen atom is placed in an electric field along the y-axis. The magnetic moment i.e electron density will he oriented along y-axis and therefore the orbital that mixes most with the ground state 1 s orbital is 2 \mathrm{p}_{\mathrm{y}}.

(a) 8, 20 and 14
(b) 8, 20 and 12 (c)10,12 and 14
(c) 10, 12 and 12

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Answer: (a)

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Q21 · June 2016 · 2 marks

Correct combination for \pi and \pi^{*} orbitals in \mathrm{B}_{2} molecule is

\pi	\pi^{*}
(a) Gerade	Ungerade
(b) Ungerade	Gerade
(c) Gerade	Gerade
(d) Ungerade	Ungerade

(a) Gerade Ungerade
(b) Ungerade Gerade
(c) Gerade Gerade
(d) Ungerade Ungerade

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Answer: (b)

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Q22 · June 2016 · 2 marks

The correct shape of \left[\mathrm{TeF}_{5}\right]^{-1} ion on the basis of VSEPR theory is

(a) Trigonal bipyramidal
(b) Square pyramidal
(c) Pentagonal planar
(d) See-saw

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Answer: (b)

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Q23 · June 2016 · 2 marks

The number of 3c-2e bonds present in \mathrm{Al}\left(\mathrm{BH}_{4}\right)_{3} is-

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

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Answer: (c)

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Q24 · Dec 2016 · 2 marks

The expected \mathbf{H}-\mathbf{H}-\mathbf{H} bond angle in \left[\mathbf{H}_{3}\right]^{+}is

(a) 180°
(b) 120°
(c) 60°
(d) \mathbf{9 0}^{\boldsymbol{\circ}}

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Answer: (c)

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Q25 · June 2016 · 2 marks

The numbers of triangular faces in square antiprism, icosahedron and tricapped trigonal prism (capped on square faces), respectively, are

(a) 8, 20 and 14
(b) 8, 20 and 12
(c) 10,12 and 14
(d) 10, 12 and 12

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Answer: (a)

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Q26 · Dec 2014 · 2 marks

The geometries of \left[\mathrm{Br}_{3}\right]^{+}and \left[\mathrm{I}_{5}\right]^{+}respectively, are

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

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Answer: (b)

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Q27 · Dec 2015 · 2 marks

The structures of \mathrm{XeF}_{2} and \mathrm{XeO}_{2} \mathrm{~F}_{2} respectively are

(a) bent, tetrahedral
(b) linear, square planar
(c) linear, see-saw
(d) bent, see-saw

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Answer: (c)

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Q28 · 2011-2020 · 2 marks

The molecule \mathrm{C}_{3} \mathrm{O}_{2} has a linear structure. This compound has

(a) 4 \sigma and 4 \pi bonds.
(b) 3 \sigma and 2 \pi bonds
(c) 2 \pi and 3 \pi bonds
(d) 3 \sigma and 4 \pi bonds

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Answer: (a)

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Q29 · Dec 2015 · 2 marks

The number of lone pair(s) of electrons on the central atom in \mathrm{[BrF_4]^-}, \mathrm{XeF_6} and \mathrm{[SbCl_6]^-} are respectively

(a) 2, 0 and 1
(b) 1, 0 and 0
(c) 2, 1 and 1
(d) 2, 1 and 0

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Answer: (c)

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Q30 · Dec 2015 · 2 marks

The ground state electronic configuration of \mathrm{C}_{2}, using all electron is

(a) \sigma_{1 \mathrm{~s}}^{2} \sigma_{1 \mathrm{~s}}^{* 2} \sigma_{2 \mathrm{~s}}^{2} \sigma_{2 \mathrm{~s}}^{* 2} \sigma_{2 \mathrm{p}}^{2} \pi_{2 \mathrm{p}}^{2}
(b) \sigma_{1 \mathrm{~s}}^{2} \sigma_{1 \mathrm{~s}}^{* 2} \sigma_{2 \mathrm{~s}}^{2} \sigma_{2 \mathrm{~s}}^{* 2} \sigma_{2 \mathrm{p}}^{2} \pi_{2 \mathrm{p}}^{* 2}
(c) \sigma_{1 \mathrm{~s}}^{2} \sigma_{1 \mathrm{~s}}^{* 2} \sigma_{2 \mathrm{~s}}^{2} \sigma_{2 \mathrm{~s}}^{* 2} \pi_{2 \mathrm{p}}^{2} \sigma_{2 \mathrm{p}}^{1} \sigma_{2 \mathrm{p}}^{* 1}
(d) \sigma_{1 \mathrm{~s}}^{2} \sigma_{1 \mathrm{~s}}^{* 2} \sigma_{2 \mathrm{~s}}^{2} \sigma_{2 \mathrm{~s}}^{* 2} \pi_{2 \mathrm{p}}^{4}

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Answer: (d)

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Q31 · June 2014 · 2 marks

The correct non-linear and iso-structural pair is

(a) \mathrm{SCl}_2 and \mathrm{I}_3^{-}
(b) \mathrm{SCl}_2, and \mathrm{I}_3^{+}
(c) \mathrm{SCl}_2, and \mathrm{ClF}_2^{-}
(d) \mathrm{I}_3^{+} and \mathrm{ClF}_2^{-}

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Answer: (b)

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Q32 · June 2014 · 2 marks

The correct non-linear and iso-structural pair is

(a) \mathrm{SCl}_{2} and \mathrm{I}_{3}^{-}
(b) \mathrm{SCl}_{2}, and \mathrm{I}_{3}^{+}
(c) \mathrm{SCl}_{2}, and \mathrm{ClF}_{2}^{-}
(d) \mathrm{I}_{3}^{+}and \mathrm{ClF}_{2}

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Answer: (b)

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Q33 · June 2014 · 2 marks

Structures of \mathrm{SbPh}_{5} and \mathrm{PPh}_{5} respectively are

(a) trigonal bipyramidal, square pyramidal
(b) square pyramidal, trigonal bipyramidal
(c) trigonal bipyramidal, trigonal bipyramidal
(d) square pyramidal, square pyramidal

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Answer: (b)

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Q34 · June 2014 · 2 marks

The maximum bond order obtained from the molecular orbitals of a transition metal dimer, formed as linear combinations of d-orbitals alone, is

(a) 3
(b) 4
(c) 5
(d) 6

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Answer: (c)

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Q35 · June 2013 · 2 marks

The number of lone-pairs are identical in the pairs

(a) \mathrm{XeF}_{4},\ \mathrm{ClF}_{3}
(b) \mathrm{XeO}_{4},\ \mathrm{ICl}_{4}^{-}
(c) \mathrm{XeO}_{2}\mathrm{F}_{2},\ \mathrm{ICl}_{4}^{-}
(d) \mathrm{XeO}_{4},\ \mathrm{ClF}_{3}

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Answer: (a)

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Q36 · Dec 2013 · 2 marks

The energy of 2s and 2p orbitals is the same for

(a) Li
(b) \mathrm{Li^{+2}}
(c) \mathrm{Be^{+2}}
(d) \mathrm{H^{-}}

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Answer: (b)

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Q37 · June 2013 · 2 marks

The number of lone-pairs are identical in the pairs

(a) \mathrm{XeF}_{4}, \mathrm{ClF}_{3}
(b) \mathrm{XeO}_{4}, \mathrm{ICl}_{4}^{-}
(c) \mathrm{XeO}_{2} \mathrm{~F}_{2}, \mathrm{ICl}_{4}^{-}
(d) \mathrm{XeO}_{4}, \mathrm{ClF}_{3}

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Answer: (a)

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Q38 · Dec 2013 · 2 marks

The molecule in which the bond order increases upon addition of an electron

(a) \mathrm{O}_{2} Li
(b) \mathrm{B}_{2} \mathrm{Li}^{+2}
(c) \mathrm{P}_{2} \mathrm{Be}^{+2}
(d) \mathrm{N}_{2} 2 \mathrm{H}^{-}

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Answer: (b)

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Q39 · June 2013 · 2 marks

The energy of 2s and 2p orbitals is the same for

(a) \mathrm{Li}
(b) \mathrm{Li}^{+2}
(c) \mathrm{Be}^{+2}
(d) \mathrm{H}^{-}

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Answer: (b)

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Q40 · Dec 2013 · 2 marks

If a homonuclear diatomic molecule is oriented along the Z-axis, the molecular orbital formed by linear combination of px, orbitals of the two atoms is

(a) \sigma
(b) \sigma^{*}
(c) \pi
(d) \delta

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Answer: (c)

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Q41 · Dec 2013 · 2 marks

According to VSEPR theory, the geometry (with lone pair) around the central iodine in \mathrm{I}_{3}^{+}and \mathrm{I}_{3}^{-} ions respectively are

(a) tetrahedral and tetrahedral
(b) trigonal bipyramidal and trigonal bipyramedal
(c) tetrahedral and trigonal bipyramidal
(d) tetrahedral and octahedral

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Answer: (c)

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Q42 · June 2012 · 2 marks

The size of the d orbitals in Si, P, S and Cl follows the order.

(a) Cl > S > P > Si
(b) Cl > P > S > Si
(c) P > S > Si > Cl
(d) Si > P > S > Cl

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Answer: (d)

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Q43 · June 2012 · 2 marks

The decreasing order of dipole moment of molecules is

(a) \mathrm{NF_3 > NH_3 > H_2O}
(b) \mathrm{NH_3 > NF_3 > H_3O}
(c) \mathrm{H_2O > NH_3 > NF_3}
(d) \mathrm{H_2O > NF_3 > NH_3}

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Answer: (d)

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Q44 · Dec 2012 · 2 marks

Which ones among \mathrm{CO}_{3}^{-2}, \mathrm{SO}_{3}, \mathrm{XeO}_{3}, and \mathrm{NO}_{3}^{-1}, have planar structure?

(a) \mathrm{CO}_{3}^{-2}, \mathrm{SO}_{3}, and \mathrm{XeO}_{3}
(b) \mathrm{SO}_{3}, \mathrm{XeO}_{3}, and \mathrm{NO}_{3}^{-}
(c) \mathrm{CO}_{3}^{-2}, \mathrm{XeO}_{3}, and \mathrm{NO}_{3}^{-}
(d) \mathrm{CO}_{3}^{-2}, \mathrm{SO}_{3}, and \mathrm{NO}_{3}^{-}

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Answer: (d)

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Q45 · June 2012 · 2 marks

The total number of lone pairs of electrons in \mathrm{I}_{3}{ }^{-}is:

(a) Zero
(b) Three
(c) Six
(d) Nine

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Answer: (d)

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Q46 · 2012 · 2 marks

The strength of \mathrm{p} \pi-\mathrm{d} \pi bonding in \mathrm{E}-\mathrm{O}(\mathrm{E}=\mathrm{Si}, \mathrm{P}, \mathrm{S} and CI) follows the order

(a) \mathrm{Si}-\mathrm{O}>\mathrm{P}-\mathrm{O}>\mathrm{S}-\mathrm{O}>\mathrm{Cl}-\mathrm{O}
(b) \mathrm{P}-\mathrm{O}>\mathrm{Si}-\mathrm{O}>\mathrm{S}-\mathrm{O}>\mathrm{Cl}-\mathrm{O}
(c) \mathrm{S}-\mathrm{O}>\mathrm{Cl}-\mathrm{O}>\mathrm{P}-\mathrm{O}>\mathrm{Si}-\mathrm{O}
(d) \mathrm{Cl}-\mathrm{O}>\mathrm{S}-\mathrm{O}>\mathrm{P}-\mathrm{O}>\mathrm{Si}-\mathrm{O}

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Answer: (d)

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Q47 · June 2012 · 2 marks

The decreasing order of dipole moment of molecules is

(a) \mathrm{NF_3 > NH_3 > H_2O}
(b) \mathrm{NH_3 > NF_3 > H_3O}
(c) \mathrm{H_2O > NH_3 > NF_3}
(d) \mathrm{H_2O > NF_3 > NH_3}

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Answer: (d)

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Q48 · Dec 2012 · 2 marks

Which ones among \mathrm{CO}_{3}^{-2}, \mathrm{SO}_{3}, \mathrm{XeO}_{3} and \mathrm{NO}_{3}^{-1}, have planar structure?

(a) \mathrm{CO}_{3}^{-2}, \mathrm{SO}_{3} and \mathrm{XeO}_{3}
(b) \mathrm{SO}_{3}, \mathrm{XeO}_{3} and \mathrm{NO}_{3}^{-}
(c) \mathrm{CO}_{3}^{-2}, \mathrm{XeO}_{3} and \mathrm{NO}_{3}^{-}
(d) \mathrm{CO}_{3}^{-2}, \mathrm{SO}_{3} and \mathrm{NO}_{3}^{-}

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Answer: (d)

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Q49 · June 2011 · 2 marks

The highest occupied MO in N_2 and O_2^+ respectively are (take x-axis as internuclear axis)

(a) \sigma_{2p_x},\ \pi^*_{2p_y}
(b) \pi_{2p_y},\ \pi_{2p_z}
(c) \sigma^*_{2p_x},\ \sigma_{2p_x}
(d) \pi^*_{2p_y},\ \pi^*_{2p_z}

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Answer: (a)

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Q50 · 2011-2020 · 2 marks

Among the following, species expected to show fluxional behaviour are (A) \mathrm{[NiCl_4]^{-2}} (tetrahedral) (B) \mathrm{IF_7} (pentagonal bipyramidal) (C) \mathrm{[CoF_6]^{-3}} (octahedral) (D) \mathrm{Fe(CO)_5} (trigonal bipyramidal)

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

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Answer: (b)

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Q51 · June 2011 · 2 marks

According to VSEPR theory, the molecule/ion having ideal tetrahedral shape is

(a) \mathrm{SF}_{4}
(b) \mathrm{SO}_{4}{ }^{-2}
(c) \mathrm{S}_{2} \mathrm{Cl}_{2}
(d) \mathrm{SO}_{2} \mathrm{Cl}_{2}

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Answer: (b)

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Q52 · June 2011 · 2 marks

The highest occupied MO in \mathrm{N}_{2} and \mathrm{O}_{2}^{+}respectively are (take x -axis as internuclear axis)

(a) \sigma_{2 \mathrm{px}}, \pi_{2 \mathrm{py}}^{*}
(b) \pi_{2 \mathrm{py}}, \pi_{2 \mathrm{pz}}
(c) \sigma_{2 \mathrm{py}}^{*}, \sigma_{2 \mathrm{px}}
(d) \pi_{2 \mathrm{py}}^{*}, \pi_{2 \mathrm{pz}}^{*}

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Answer: (a)

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Q53 · June 2011 · 2 marks

The molecule with highest number of lone-pairs and has a linear shape based on VSEPR theory is:

(a) \mathrm{CO}_{2}
(b) \Gamma_{3}
(c) \mathrm{NO}_{2}^{-}
(d) \mathrm{NO}_{2}^{+}

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Answer: (b)

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