Chemical Bonding — Free Practice Questions | Mockzy

1

Consider the following statements. (A) PCl5 has an expanded octet. (B) PCl5 is a reactive molecule. (C) PCl5 is sp3 d hybridised. The correct statement(s) is/are:

A

Only A

B

Only C

C

Only A and B

D

A, B and C

2

In which of the following molecules octet rule is violated?

A

NH3

B

CH4

C

CO2

D

BF3

3

Which of the following has bond order 2?

A

NO

B

CN

C

CN–

D

CN+

4

Which of the following pairs of ions are isoelectronic and isostructural?

A

ClO3– , CO32–

B

SO32– , NO3–

C

ClO3– , SO32–

D

CO32– , SO32–

5

Which molecule has the highest dipole moment?

A

CH4

B

CHCl3

C

CCl4

D

CHI3

6

Which of the following is correct molecular orbital representation of 2px-molecular orbital?

A

(1)

B

(2)

C

(3)

D

(4)

7

Calcium reacts with an element (X) to form an ionic compound. If the ground state electronic configuration of (X) is 1s2 2s2 2p5 , the simplest formula for this compound is;

A

Ca2X3

B

CaX2

C

Ca2X

D

Ca3X2

8

A

B

C

D

9

Which of the following orbitals can form bond, if internuclear axis is y-axis?

A

px dxy

B

pz dxz

C

dyz dxz

D

dxz dxz

10

A

A-II, B-I, C-III, D-IV

B

A-II, B-III, C-I, D-IV

C

A-II, B-III, C-IV, D-I

D

A-III, B-II, C-IV, D-I

11

Lattice enthalpy of an ionic compound depends upon;

A

Only charge on the ions

B

Only size of the ions

C

Only packing of the ions

D

Both charge and size of the ions

12

Identify which of the following has T-shape.

A

BrF5

B

XeF4

C

ClF3

D

H2O

13

Total number of lone pair present in XeF4 molecule is;

A

16

B

2

C

14

D

9

14

Identify which of the following has a see-saw shape?

A

CH4

B

CHCl3

C

PO43–

D

SF4

15

N2 and O2 are converted into monocations, N2+ and O2+ respectively. Which of the following statement is wrong?

A

In N2+, N–N bond weakens

B

In O2+, the O–O bond order increases

C

O2+ is paramagnetic

D

N2+ is diamagnetic

16

Which of the following species contains three bond pairs and one lone pair around the central atom?

A

NH2–

B

PCl3

C

H2O

D

BF3

17

Total number of canonical structures of CO32– is;

A

2

B

3

C

4

D

5

18

A

Statement I is correct but statement II is incorrect

B

Statement I is incorrect but statement II is correct

C

Both Statement I and statement II are correct

D

Both Statement I and statement II are incorrect

19

In which molecule all atoms are coplanar

A

B

C

D

20

Incorrect order of bond angle is given in;

A

NH NH 3 2

B

CCl CH 4 4

C

BF AlCl 3 3

D

NH NH 4 3

21

A

Statement-1 is true, statement-II is true and statement-II is correct explanation for statement-1.

B

Statement-1 is true, statement-II is true but statement-II is NOT the correct explanation for statement-1.

C

Statement-1 is true, statement-II is false.

D

Statement-1 is false, statement-II is true.

22

Predict the correct order of repulsion among the following;

A

lone pair – lone pair > lone pair – bond pair > bond pair – bond pair

B

lone pair – lone pair > bond pair – bond pair > lone pair – bond pair

C

bond pair – bond pair > lone pair – bond pair > lone pair – lone pair

D

lone pair – bond pair > bond pair – bond pair > lone pair – lone pair

23

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R): Assertion (A) : CO2 contains polar covalent bonds. Reason (R): CO2 is a linear molecule. In the light of the above statements, choose the correct answer from the options given below:

A

A is true but R is false.

B

A is false but R is true.

C

Both A and R are true and R is the correct explanation of A.

D

Both A and R are true but R is NOT the correct explanation of A.

24

Which of the given compounds contain ionic bond, covalent bond as well as co-ordinate bond?

A

Na2CO3

B

NaCl

C

NH4Cl

D

HCN

25

Which of the following statement is not correct?

A

A sigma bond is weaker than bond.

B

A sigma bond is stronger than bond.

C

A double bond is stronger than a single bond.

D

A double bond is shorter than a single bond.

26

The hybridization state of the central atom in I3– is;

A

sp2

B

sp3 d

C

sp3

D

sp3 d2

27

Which of the following diatomic molecular species has only π bonds according to Molecular Orbital Theory?

A

O2

B

N2

C

C2

D

Be2

28

Which one is paramagnetic and has the bond order 1/2

A

B

C

D

29

In SO42–, bond order of S–O is:

A

1.5

B

2

C

1.33

D

2.5

30

Three diatomic species are listed below in different sequences. Which of these presents the correct order of their increasing bond order?

A

B

C

D

31

Among CaH2, BeH2, BaH2, the order of ionic character is;

A

BeH2 > CaH2 > BaH2

B

CaH2 > BeH2 > BaH2

C

BeH2 > BaH2 > CaH2

D

BaH2 > BeH2 > CaH2

32

In PO43–, the formal charge on each oxygen atom and the P–O bond order, respectively are;

A

–0.75 and 0.6

B

–0.75 and 1.0

C

–0.75 and 1.25

D

–3 and 1.25

33

Which of the following is a planar species?

A

ClO3–

B

CO32–

C

AsO33–

D

SO32–

34

Match List-I with List-II. List-I List-II A. NH4+ I. Octahedral B. BF3 II. Tetrahedral C. HgCl2 III. Trigonal planar D. SF6 IV. Linear Choose the correct answer from the options given below:

A

A-III, B-II, C-IV, D-I

B

A-I, B-II, C-III, D-IV

C

A-II, B-III, C-IV, D-I

D

A-II, B-III, C-I, D-IV

35

Which of the following is not isostructural with SiCl4?

A

NH4+

B

SCl4

C

SO42–

D

PO43–

36

Which among the following molecules has bond order 3?

A

Cl2

B

NO

C

Ne2

D

N2

37

The correct order of increasing bond angles in the following triatomic species is;

A

B

C

D

38

The electronic configuration of a metal ‘M’ is 1s2 2s2 2p6 3s1 . The formula of its oxide will be;

A

MO

B

M2O

C

M2O3

D

MO2

39

Maximum number of hydrogen bonds formed by a water molecule in ice are:

A

4

B

3

C

2

D

1

40

The correct decreasing order of lattice energy is;

A

KF KCl KBr KI

B

KCl KF KBr KI

C

KBr KCl KF KI

D

KI KBr KCl KF

41

Consider the molecules CH4, NH3 and H2O. Which of the given statements is false?

A

The H–C–H bond angle in CH4, the H–N–H bond angle in NH3 and the H–O–H bond angle in H2O are all greater than 90°.

B

The H–O–H bond angle in H2O is larger than the H–C–H bond angle in CH4.

C

The H–O–H bond angle in H2O is smaller than the H–N–H bond angle in NH3.

D

The H–C–H bond angle in CH4 is larger than the H–N–H bond angle in NH3.

42

Choose the incorrect match.

A

HI – Linear

B

CCl4 – Tetrahedral

C

H2 – Bent

D

CO2 – Linear

43

Which of the following is incorrect?

A

NO2 is sp hybridised

B

NH4+ is sp3 hybridised

C

CH3 is planar

D

BF3 is non-planar

44

Molecular shapes of CF4 and XeF4 are;

A

The same, with 0 and 1 lone pair of electrons respectively.

B

The same, with 1 and 1 lone pair of electrons respectively.

C

Different, with 1 and 2 lone pair of electrons respectively.

D

Different, with 0 and 2 lone pair of electrons respectively.

45

All of the following are diamagnetic in nature, except:

A

N2

B

H2

C

Li2

D

O2

46

The hybridization of N in N(SiH₃)₃ and the shape of N(SiH₃)₃ respectively are

A

sp² and bent

B

sp² and planar

C

sp³ and pyramidal

D

sp³ and tetrahedral

47

Which of the following has the highest bond order?

A

O2+

B

O2

C

O2–

D

O22–

48

Consider the following species: NO, H₂SO₄, O₃, NO₂, PCl₅, N₂O, CO₂ The number of species which do not follow octet rule is:

A

4

B

5

C

6

D

7

49

The correct decreasing order of dipole moment is given in:

A

HF > H2O > NH3 > NF3

B

NF3 > NH3 > HF > H2O

C

H2O > HF > NH3 > NF3

D

H2O > NH3 > HF > NF3

50

Shape of H2S is:

A

Linear

B

Trigonal pyramidal

C

Trigonal planar

D

Bent

51

XeF2 is isostructural with:-

A

BeCl2

B

CCl4

C

ICl2–

D

SbCl3

52

A

B

C

D

53

The electron adds to which one of the following orbitals during change of N2 to N2– ?

A

σ orbital

B

σ* orbital

C

π* orbital

D

π orbital

54

The bond order of a molecule is given by:

A

the total number of electrons in bonding and antibonding orbitals.

B

the difference between the number of electrons in bonding and antibonding orbitals.

C

twice the difference between the number of electrons in bonding and antibonding orbitals.

D

half the difference between the number of electrons in bonding and antibonding orbitals.

55

The correct order of dipole moment is :

A

B

C

D

56

A

B

C

D

57

Given below are two statements: Statements I: XeO3 is a planar molecule. Statements II: XeO3 is sp3 hybridised. In the light of the above statements, choose the most appropriate answer from the options given below:

A

Statement I is correct but Statement II is incorrect.

B

Statement I is incorrect but Statement II is correct.

C

Both Statement I and Statement II are correct.

D

Both Statement I and Statement II are incorrect.

58

The correct order of volatility is;

A

B

C

CH3OH > CH3 — O — CH3

D

HF > HCl

59

A

If both Assertion & Reason are True & Reason is a correct explanation of the Assertion.

B

If both Assertion & Reason are True but Reason is not a correct explanation of Assertion.

C

If Assertion is True but the Reason is False.

D

If both Assertion and Reason are False.

60

A

B

C

D

61

Among the following, covalent bond length is minimum for:

A

C – C

B

C – H

C

C – N

D

C = O

62

Correct Lewis representation of O3 molecule is;

A

(1)

B

(2)

C

(3)

D

(4)

63

Given below are two statements: Statements I: AlCl3 is sp2 hybridised. Statements II: AlCl4– is sp3 hybridised. In the light of the above statements, choose the most appropriate answer from the options given below:

A

Statement I is correct but Statement II is incorrect.

B

Statement I is incorrect but Statement II is correct.

C

Both Statement I and Statement II are correct.

D

Both Statement I and Statement II are incorrect.