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Chemical Bonding and Atomic Structure MCQs for NEET — Chemistry Questions with Answers

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In ${Al}_{2} {Cl}_{6}$ , which statement is incorrect?

Four $Al — Cl$ bonds are of same length and two of different length

Six $Al — Cl$ bonds are of same length and two of different length

The angle $Cl — Al — Cl$ is $110 °$ and $93 °$

The angle $Al — Cl — Al$ is $87 °$

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Explanation

In Al2Cl6, there are six Al-Cl bonds, and all six bonds are of the same length due to the symmetrical nature of the molecule. The incorrect statement is that there are four Al-Cl bonds of the same length and two of different lengths.

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Carbon dioxide is a gas but silica is a solid because:

carbon dioxide is composed of discrete covalent ${CO}_{2}$ molecules whereas silica has continuous

tetrahedral structure

${CO}_{2}$ molecules are lighter than ${SiO}_{2}$ molecules

${CO}_{2}$ is more acidic than ${SiO}_{2}$

melting point of silica is very high

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Explanation

If that is true, and elements in the same period have similar properties because they have the same number of valence electrons, then why is $S i O_{2}$ a solid and $C O_{2}$ a gas? Surely a difference in mass by a factor of 2.5 can't be that big a deal.

Is it because of a van der Waals force difference, because silicon has extra electrons which result in compounds being formed from it being more symmetrical than those formed from carbon?

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Most ionic chloride is:

$P b C l_{2}$

$C C l_{4}$

$P b C l_{4}$

$S i C l_{4}$

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Explanation

lower the oxidation no , higher is the ionic character.

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Which is covalent solid?

Fe₂O₃

Diamond

Graphite

All of these

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Explanation

(d) All are covalent molecules. A covalent solid has atoms as constituent units at lattice points held together by covalent bonds.

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Which of the following has been arranged in order of decreasing bond dissociation energy:

P-O>Cl-O>S-O

P-O>S-O>Cl-O

S-O>Cl-O>P-O

Cl-O>S-O>P-O

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Explanation

Bond dissociation energy $\propto \frac{1}{Bond Length}$

Order of bond length: P-O > S-O >Cl- O Order of BDE: Cl-O> S-O>P-O

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Which set of oxide of nitrogen is paramagnetic in nature?

NO, N₂O

NO₂, NO, N₂O

NO,NO₂

N₂O,NO₂

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Explanation

NO and NO₂are paramagnetic in nature

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The following solid exists in the form of ions:-

BI₃

BCl₃

BF₃

CaBO₂

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Explanation

CaBO₂is calcium meta borate (Ca²⁺BO^-₂).

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Match the interhaIogen compounds of Column I with the geometry in Column II and assign the correct code.

Column I Column II
A. XX' (i) T-shape
B. XX'₃ (ii) Pentagonal bipyramidal
C. XX'₅ (iii) Linear
D. XX'₇ (iv) Square-pyramidal
(v) Tetrahedral

Code
A B C D

(iii) (iv) (i) (ii)

(iii) (i) (iv) (ii)

(v) (iv) (iii) (ii)

(iv) (iii) (ii) (i)

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Explanation

(b) Two different halogens may react to form interhalogen compounds as

XX' (ClF,BrF,BrCl,IF,ICl) Linear

XX'₃ (ClF₃,BrF₃,IF₃,ICl₃) Bent T-shaped

XX'₅ (ClF₅,BrCl₅,IF₅) Square-pyramidal

XX'₇ (IF₇) Pentagonal bipyramidal

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Among the following, which one is a wrong statement?

PH₅ and BiCl₅ do not exist

ρp-dp bonds are present in SO₂

SeF₄ and CH₄ have same shape

$I_{3}^{+}$ has bent geometry

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Explanation

The statement that SeF4 and CH4 have the same shape is incorrect. SeF4 has a see-saw shape (distorted tetrahedral), while CH4 has a tetrahedral shape. The other statements given are correct.

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Match the compounds given in column I with the hybridisation and shape given in column II and mark the correct option.

Column I Column II
A. XeF₆ 1. Distorted octahedral
B. XeO₃ 2. Square planar
C. XeOF₄ 3. Pyramidal
D. XeF₄ 4. Square pyramidal

Codes
A B C D

1 2 4 3

4 3 1 2

4 1 2 3

1 3 4 2

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