Inorganic Chemistry

IIT-JAM Chemistry — Main Group Elements previous year questions

20 questions · 2001–2005 · all with verified answer · last checked 2026-11-06

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Q1 · 2005-2022 · 2 marks

Which of the following reactions does not give \mathrm{H}_{3} \mathrm{PO}_{4} ?

(a) \mathrm{Ca}_{3}\left(\mathrm{PO}_{4}\right)_{2}+\mathrm{H}_{2} \mathrm{SO}_{4} \longrightarrow
(b) \mathrm{P}_{4} \mathrm{O}_{6}+\mathrm{H}_{2} \mathrm{O} \longrightarrow
(c) \mathrm{PCl}_{5}+\mathrm{H}_{2} \mathrm{O} \longrightarrow
(d) \mathrm{P}_{4} \mathrm{~S}_{10}+\mathrm{H}_{2} \mathrm{O} \longrightarrow

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Answer: (b)

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Q2 · 2001-2022 · 2 marks

The compound having an S-S single bond is

(a) \mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{3}
(b) \mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{4}
(c) \mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{7}
(d) \mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{8}

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Answer: (b)

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Q3 · 2005-2022 · 2 marks

Calgon used for water softening is \mathrm{Na}_{2}\left[\mathrm{Na}_{4}\left(\mathrm{PO}_{3}\right)_{6}\right] and it is prepared by heating microcosmic salt. The microcosmic salt is:

(a) \mathrm{Na}_{2} \mathrm{HPO}_{3}
(b) \mathrm{NaH}_{2} \mathrm{PO}_{4}
(c) \mathrm{Na}_{2} \mathrm{HPO}_{4}
(d) \mathrm{Na}\left(\mathrm{NH}_{4}\right) \mathrm{HPO}_{4} IIT JAM 2011

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Answer: (d)

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Q4 · 2005-2022 · 2 marks

In the structure of \mathrm{B}_{4} \mathrm{O}_{5}(\mathrm{OH})_{4}{ }^{2-}

(a) All four B atoms are trigonal planar
(b) One B atom is tetrahedral and the other three are trigonal planar
(c) Three B atoms are tetrahedral and one is trigonal planar.
(d) Two B atoms are tetrahedral and the other two are trigonal planar

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Answer: (d)

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Q5 · 2005-2022 · 2 marks

Hydrolysis of \left(\mathrm{CH}_{3}\right)_{2} \mathrm{SiCl}_{2} and \mathrm{CH}_{3} \mathrm{SiCl}_{3} leads to

(a) Linear chain and cross-linked silicones, respectively
(b) Cross-linked and linear chain silicones, respectively
(c) Linear chain silicones only
(d) Cross-linked silicones only

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Answer: (a)

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Q6 · 2005-2022 · 2 marks

Number of three-centre two-electron (3e-2e) bonds present in diborane is:

(a) 2
(b) 4
(c) 6
(d) 8 IIT JAM 2013

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Answer: (a)

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Q7 · 2005-2022 · 2 marks

Which one of the following order of the carbonates is Correct for their decomposition temperature?

(a) \mathrm{BaCO}_{3}>\mathrm{CaCO}_{3}>\mathrm{SrCO}_{3}>\mathrm{MgCO}_{3}
(b) \mathrm{BaCO}_{3}>\mathrm{SrCO}_{3}>\mathrm{CaCO}_{3}>\mathrm{MgCO}_{3}
(c) \mathrm{MgCO}_{3}>\mathrm{CaCO}_{3}>\mathrm{SrCO}_{3}>\mathrm{BaCO}_{3}
(d) \mathrm{MgCO}_{3}>\mathrm{CaCO}_{3}>\mathrm{BaCO}_{3}>\mathrm{SrCO}_{3} IIT JAM 2015

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Answer: (b)

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Q8 · 2005-2022 · 2 marks

The species responsible for the superacidity of \mathrm{SbF}_{5}-\mathrm{HSO}_{3} \mathrm{~F} system is

(a) \mathrm{HSO}_{3} \mathrm{~F}
(b) \mathrm{SbF}_{5}
(c) HF
(d) \mathrm{H}_{2} \mathrm{SO}_{3} \mathrm{~F}^{+} IIT JAM 2016

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Answer: (d)

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Q9 · 2005-2022 · 2 marks

The final products in the reaction of \mathrm{BF}_{3} with water are

(a) \mathrm{B}(\mathrm{OH})_{3} and \mathrm{OF}_{2}
(b) \mathrm{H}_{3} \mathrm{BO}_{3} and \mathrm{HBF}_{4}
(c) \mathrm{B}_{2} \mathrm{O}_{3} and \mathrm{HBF}_{4}
(d) \mathrm{B}_{2} \mathrm{H}_{6} and HF

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Answer: (b)

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Q10 · 2005-2022 · 2 marks

The number of \mathrm{S-S} bond(s) in tetrathionate ion is

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Answer: 3

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Q11 · 2005-2022 · 2 marks

The number of isomeric structures of di-substituted borazine \left(\mathrm{B}_{3} \mathrm{~N}_{3} \mathrm{H}_{4} \mathrm{X}_{2}\right) is ____ IIT JAM 2018

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Answer: 4

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Q12 · 2005-2022 · 2 marks

The CORRECT order of melting points of group 15 trifluorides is

(a) \mathrm{PF}_{3}<\mathrm{AsF}_{3}<\mathrm{SbF}_{3}<\mathrm{BiF}_{3}
(b) \mathrm{BiF}_{3}<\mathrm{SbF}_{3}<\mathrm{PF}_{3}<\mathrm{AsF}_{3}
(c) \mathrm{PF}_{3}<\mathrm{SbF}_{3}<\mathrm{AsF}_{3}<\mathrm{BiF}_{3}
(d) \mathrm{BiF}_{3}<\mathrm{AsF}_{3}<\mathrm{SbF}_{3}<\mathrm{PF}_{3}

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Answer: (a)

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Q13 · 2005-2022 · 2 marks

On hydrolysis, aluminium carbide produces

(a) \mathrm{CH}_{4}
(b) \mathrm{C}_{2} \mathrm{H}_{6}
(c) \mathrm{C}_{2} \mathrm{H}_{4}
(d) \mathrm{C}_{2} \mathrm{H}_{2} IIT JAM 2019

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Answer: (a)

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Q14 · 2005-2022 · 2 marks

Among the following compounds, the one having the lowest boiling point is

(a) \mathrm{SnCl}_{4}
(b) \mathrm{GeCl}_{4}
(c) \mathrm{SiCl}_{4}
(d) \mathrm{CCl}_{4}

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Answer: (c)

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Q15 · 2005-2022 · 2 marks

Among the following, the correct statement is

(a) The density follows the order, \mathrm{Cs}>\mathrm{Rb}>\mathrm{Li}>\mathrm{Na}.
(b) The solubility in water follows the order, \mathrm{Cs}_{2} \mathrm{CO}_{3}>\mathrm{K}_{2} \mathrm{CO}_{3}>\mathrm{Na}_{2} \mathrm{CO}_{3}>\mathrm{Li}_{2} \mathrm{CO}_{3}.
(c) The first ionization potential follows the order, \mathrm{Li}>\mathrm{K}>\mathrm{Na}>\mathrm{Cs}.
(d) The melting point follows the order, \mathrm{MgCl}_{2}>\mathrm{BeCl}_{2}>\mathrm{CaCl}_{2}>\mathrm{SrCl}_{2}.

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Answer: (b)

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Q16 · 2005-2022 · 2 marks

Treatment of formic acid with concentrated sulfuric acid gives

(a) \mathrm{CO}+\mathrm{H}_{2} \mathrm{O}
(b) \mathrm{CO}_{2}+\mathrm{H}_{2}
(c) \mathrm{HCHO}+\frac{1}{2} \mathrm{O}_{2}
(d) no product (no reaction)

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Answer: (a)

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Q17 · 2005-2022 · 2 marks

The coordination number of aluminium ion and the number of bridging hydrogen atoms in \left[\mathrm{Al}\left(\mathrm{BH}_{4}\right)_{4}\right]^{-}are respec tively,

(a) 8 and 8
(b) 6 and 6
(c) 4 and 6
(d) 8 and 12

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Answer: (a)

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Q18 · 2005-2022 · 2 marks

The major product formed in the following reaction \mathrm{K}+\mathrm{O}_{2} \rightarrow is

(a) \mathrm{K}_{2} \mathrm{O}
(b) \mathrm{K}_{2} \mathrm{O}_{2}
(c) \mathrm{KO}_{2}
(d) \mathrm{K}_{2} \mathrm{O}_{3}

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Answer: (c)

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Q19 · 2005-2022 · 2 marks

Among the following, the compound that forms the strongest hydrogen bond is

(a) HF
(b) HCl
(c) HBr
(d) HI

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Answer: (a)

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Q20 · 2005-2022 · 2 marks

The stability of adducts \mathrm{H}_{3} \mathrm{~B} \cdot \mathrm{PF}_{3}, \mathrm{H}_{3} \mathrm{~B} \cdot \mathrm{NMe}_{3}, \mathrm{H}_{3} \mathrm{~B} \cdot \mathrm{CO}, \mathrm{H}_{3} \mathrm{~B} \cdot \mathrm{OMe}_{2} follows the order

(a) \mathrm{H}_{3} \mathrm{~B} \cdot \mathrm{OMe}_{2}<\mathrm{H}_{3} \mathrm{~B} \cdot \mathrm{CO}<\mathrm{H}_{3} \mathrm{~B} \cdot \mathrm{PF}_{3}<\mathrm{H}_{3} \mathrm{~B} \cdot \mathrm{NMe}_{3}
(b) \mathrm{H}_{3} \mathrm{~B} \cdot \mathrm{PF}_{3}<\mathrm{H}_{3} \mathrm{~B} \cdot \mathrm{CO}<\mathrm{H}_{3} \mathrm{~B} \cdot \mathrm{NMe}_{3}<\mathrm{H}_{3} \mathrm{~B} \cdot \mathrm{OMe}_{2}
(c) \mathrm{H}_{3} \mathrm{~B} \cdot \mathrm{CO}<\mathrm{H}_{3} \mathrm{~B} \cdot \mathrm{PF}_{3}<\mathrm{H}_{3} \mathrm{~B} \cdot \mathrm{NMe}_{3}<\mathrm{H}_{3} \mathrm{~B} \cdot \mathrm{OMe}_{2}
(d) \mathrm{H}_{3} \mathrm{~B} \cdot \mathrm{PF}_{3}<\mathrm{H}_{3} \mathrm{~B} \cdot \mathrm{CO}<\mathrm{H}_{3} \mathrm{~B} \cdot \mathrm{OMe}_{2}<\mathrm{H}_{3} \mathrm{~B} \cdot \mathrm{NMe}_{3}

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Answer: (d)

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