JEE Chemistry Chemical Bonding and Molecular Structure MCQs Set C

Question: Based on the following Lewis dot structure which of the given statement(s) is/are correct?

(i) There is formation of a double bond and two single bonds.
(ii) There are two additional electrons than those provided by the neutral atoms.
(iii) The least electropositive atom occupies the central position in the molecule/ion. 

• a) (i) and (ii)
• b) (i), (ii) and (iii)
• c) (i) and (iii)
• d) (iii) only

Answer: (i) and (ii)

Question: Choose the correct sequence of T and F for following statements. Here T stands for true statement and F standsfor false statement.

(i) Formal charge in the Lewis structure helps in keeping track of the valence electrons in the molecule.
(ii) Formal charge indicates the actual charge separation within the molecule.
(iii) Formal charges help in the selection of the lowest energy structure from a number of possible Lewis structures.

• a) T F T
• b) F T T
• c) T T F
• d) T T T

Answer: T F T

Question: Read the following statements and choose the correct option. Here T stands for True and F stands for False statement.

(i) The smaller the size of the cation and the larger the size of the anion, the greater the covalent characterof an ionic bond.
(ii) The smaller the charge on the cation, the greater the covalent character of the ionic bond.
(iii) For cations of the same size and charge, the one, with electronic configuration (n ^{– 1})dⁿns⁰, typical of transition metals, is more polarising than the one with a noble gas configuration, ns² np⁶, typical of alkali and alkaline earth metal cations.

• a) T F T
• b) T T T
• c) T T F
• d) F T T

Answer: T F T

Question:

• a) T T F T
• b) T F T F
• c) T T T T
• d) T T F F

Answer: T T F T

Question:

• a) TFTF
• b) TFFF
• c) TTTF
• d) TFTT

Answer: TFTF

Question: Which of the following statements is/are not correct for combination of atomic orbitals?

(i) The combining atomic orbitals must have the same or nearly the same energy.
(ii) Greater the extent of overlap, the greater will be the electron density between the nuclei of a moleculer orbital.
(iii) 2p_z orbital of one atom can combine with either of 2p_x, 2p_y or 2p_z orbital of other atom as these orbitals have same energy.

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

Answer: (iii) only

Question:

• a) A – (r), B – (q), C – (p)
• b) A – (r), B – (p), C – (q)
• c) A – (q), B – (r), C – (p)
• d) A – (p), B – (q), C – (r)

Answer:  A – (r), B – (q), C – (p)

Question:

• a) A – (p, r), B – (p, s), C – (q), D – (p, s)
• b) A – (q), B – (r), C – (p, q), D – (s)
• c) A – (q), B – (r), C – (p), D – (s)
• d) A – (p, q, r), B – (q, r), C – (p, q), D – (r)

Answer: A – (p, r), B – (p, s), C – (q), D – (p, s)

Question:  Match Column-I with Column-II and Column-III and choose the correct option from the given codes.

• a) A – (iv, q); B – (i, p); C – (ii, s); D – (iii, r)
• b) A – (i, p); B – (iii, s); C – (iv, r); D – (ii, q)
• c) A – (iv, p); B – (i, r); C – (iii, q); D – (ii, s)
• d) A – (iv, q); B – (ii, p); C – (i, r); D – (iii, s)

Answer:  A – (iv, q); B – (i, p); C – (ii, s); D – (iii, r)

Question:

• a) A – (s), B – (q), C – (p), D – (r)
• b) A – (r), B – (p), C – (q), D – (s)
• c) A – (s), B – (r), C – (q), D – (p)
• d) A – (p), B – (q), C – (r), D – (s)

Answer: A – (s), B – (q), C – (p), D – (r)

More Questions..................................

Question:

• a)  A – (q), B – (q), C – (p), D – (r)
• b) A – (r), B – (p), C – (q), D – (p)
• c) A – (p), B – (r), C – (q), D – (p)
• d) A – (p), B – (q), C – (p), D – (r)

Answer: A – (q), B – (q), C – (p), D – (r)

Question:  Match Column-I (molecule) with Column-II (type of hybridisation) and choose the correct option from the codes given below

• a) A – (r), B – (p), C – (s), D – (q)
• b) A – (r), B – (p), C – (q), D – (s)
• c) A – (p), B – (r), C – (s), D – (q)
• d) A – (p), B – (r), C – (q), D – (s)

Answer: A – (r), B – (p), C – (s), D – (q)

Question:

• a) A – (p), B – (s),C – (q), D – (r)
• b) A – (s), B – (r), C – (q), D – (p)
• c) A – (q), B – (r),C – (s), D – (p)
• d) A – (p), B – (q),C – (r), D – (s)

Answer: A – (p), B – (s),C – (q), D – (r)

Question:

• a) A – (q, iii), B – (p, ii), C – (r, i)
• b) A – (p, iii), B – (q, ii), C – (r, i)
• c) A – (p, ii), B – (q, iii), C – (r, i)
• d) A – (q, iii), B – (r, i), C – (p, ii)

Answer: A – (q, iii), B – (p, ii), C – (r, i)

Question: 

Assertion : Atoms can combine either by transfer of valence of electrons from one atom to another or by sharing of valence electrons.
Reason : Sharing and transfer of valence electrons is done by atoms to have an octet in their valence shell.

• a) Assertion is correct, reason is correct; reason is a correct explanation for assertion
• b) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
• c) Assertion is correct, reason is incorrect
• d) Assertion is incorrect, reason is correct

Answer: Assertion is correct, reason is correct; reason is a correct explanation for assertion

Question:

• a) Assertion is correct, reason is correct; reason is a correct explanation for assertion
• b) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
• c) Assertion is correct, reason is incorrect
• d) Assertion is incorrect, reason is correct

Answer: Assertion is correct, reason is correct; reason is a correct explanation for assertion

Question:

Assertion : The lesser the lattice enthalpy more stable is the ionic compound.
Reason : The lattice enthalpy is greater, for ions of highest charge and smaller radii.

• a) Assertion is incorrect, reason is correct.
• b) Assertion is correct, reason is incorrect
• c) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
• d) Assertion is correct, reason is correct; reason is a correct explanation for assertion

Answer: Assertion is incorrect, reason is correct.

Question:

Assertion : Sulphur compounds like SF6 and H2SO4 have 12 valence electrons around S atom.
Reason : All sulphur compounds do not follow octet rule.

• a) Assertion is correct, reason is incorrect
• b) Assertion is incorrect, reason is correct.
• c) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
• d) Assertion is correct, reason is correct; reason is a correct explanation for assertion

Answer: Assertion is correct, reason is incorrect

Question:

Assertion : BF3 molecule has zero dipole moment.
Reason : F is electronegative and B–F bonds are polar in nature.

• a) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
• b) Assertion is correct, reason is incorrect
• c) Assertion is incorrect, reason is correct.
• d) Assertion is correct, reason is correct; reason is a correct explanation for assertion

Answer: Assertion is correct, reason is correct; reason is not a correct explanation for assertion

Question:

Assertion : CH₂Cl₂ is non-polar and CCl₄ is polar molecule.
Reason : Molecule with zero dipole moment is non-polar in nature.

• a) Assertion is incorrect, reason is correct
• b) Assertion is correct, reason is incorrect
• c) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
• d) Assertion is correct, reason is correct; reason is a correct explanation for assertion

Answer: Assertion is incorrect, reason is correct

Question:

Assertion : Lone pair-lone pair repulsive interactions are greater than lone pair-bond pair and bond pair-bond pair interactions.
Reason : The space occupied by lone pair electrons is more as compared to bond pair electrons.

• a) Assertion is correct, reason is correct; reason is a correct explanation for assertion.
• b) Assertion is incorrect, reason is correct.
• c) Assertion is incorrect, reason is correct.
• d) Assertion is correct, reason is correct; reason is not a correct explanation for assertion

Answer: Assertion is correct, reason is correct; reason is a correct explanation for assertion.

Question:

Assertion : In NH₃, N is sp³ hybridised, but angle is found to be 107°.
Reason : The decrease in bond angle is due to repulsion between the lone pair.

• a) Assertion is correct, reason is correct; reason is a correct explanation for assertion.
• b) Assertion is incorrect, reason is correct.
• c) Assertion is correct, reason is incorrect
• d) Assertion is correct, reason is correct; reason is not a correct explanation for assertion

Answer: Assertion is correct, reason is correct; reason is a correct explanation for assertion.

Question:

Assertion : Shape of NH₃ molecule is tetrahedral.
Reason : In NH₃ nitrogen is sp³ hybridized

• a) Assertion is incorrect, reason is correct.
• b) Assertion is correct, reason is incorrect
• c) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
• d) None of these

Answer: Assertion is incorrect, reason is correct.

Question:

Assertion : The bond order of helium is always zero.
Reason : The number of electrons in bonding molecular orbital and antibonding molecular orbital is equal.

• a) Assertion is correct, reason is correct; reason is a correct explanation for assertion.
• b) Assertion is incorrect, reason is correct.
• c) Assertion is correct, reason is incorrect
• d) Assertion is correct, reason is correct; reason is not a correct explanation for assertion

Answer: Assertion is correct, reason is correct; reason is a correct explanation for assertion.

Question:

• a) Assertion is correct, reason is correct; reason is a correct explanation for assertion.
• b) Assertion is incorrect, reason is correct.
• c) Assertion is correct, reason is incorrect
• d) Assertion is correct, reason is correct; reason is not a correct explanation for assertion

Answer: Assertion is correct, reason is correct; reason is a correct explanation for assertion.

Question:

Assertion : Water is one of the best solvent.
Reason : H-bonding is present in water molecules.

• a) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
• b) Assertion is correct, reason is incorrect
• c) Assertion is incorrect, reason is correct
• d) Assertion is correct, reason is correct; reason is a correct explanation for assertion

Answer: Assertion is correct, reason is correct; reason is not a correct explanation for assertion

Question:

Assertion : Bonding molecular orbital has greater stability than corresponding antibonding molecular orbital.
Reason : The electron density in a bonding molecular orbital is located away from the space between the nuclei while in antibonding molecular orbital it is located between the nuclei of the bonded atoms.

• a) Assertion is correct, reason is incorrect
• b) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
• c) Assertion is incorrect, reason is correct
• d) Assertion is correct, reason is correct; reason is a correct explanation for assertion

Answer: Assertion is correct, reason is incorrect

Question:  What is the correct mode of hybridisation of the central atom in the following compounds?

• a)

  

  

• b)

  

   

• c) Both
• d) None of these

Answer:

Question: Which of the following molecules has trigonal planar geometry?

• a) BF³
• b) PCl³
• c) NH³
• d) IF³

Answer: BF³

Question:  Which of the following molecules is planar?

• a) XeF₄
• b) SiF₄
• c) SF₄
• d) NF₃

Answer: XeF₄

Question:  Hybridization present in ClF₃ is

• a) sp³d
• b) sp³
• c) sp²
• d) dsp²

Answer: sp³d

Question:  Which of the following represents the given mode of hybridisation sp² –sp² – sp - sp from left to right ?

• a)

  

• b)

  

• c)

  

• d) None of these

Answer:

Question:

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question: The type of hybridization in xenon atom and the number of lone pairs present on xenon atom in xenon hexafluoride molecule are respectively

• a) sp³d³ , one
• b) sp³d³ , two
• c) sp³d³ ,zero
• d) None of these

Answer: sp³d³ , one

Question:  In which of the following species, all the three types of hybrid carbons are present?

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question: If an organic compound contain 92.3% C and 7.7% H, than number of sp³,sp² and sp hybridized carbon atoms in all possible structures of compound respectively are (molecular mass = 52g/mol)

• a) 0, 8, 4
• b) 1, 2, 5
• c) 0, 4, 4
• d) None of these

Answer: 0, 8, 4

Question:

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

Answer: (i), (ii) and (iii)

Question: Which of the following molecule exist ?

• a) Li₂
• b) He₂
• c) Be₂
• d) None of these

Answer: Li₂

Question: Hybridization and structure of I^3– are

• a) sp³d and linear
• b) sp³ and T-shape
• c) sp³d² and linear
• d) None of these

Answer:  sp³d and linear

Question: What is the change in hybridization when AlCl₃ changes to

• a) sp² to sp³d²
• b) sp³d to sp³d²
• c) sp³ to sp³d
• d) None of these

Answer: sp² to sp³d²

Question:  From the given figure the van der Waal radius and covalent radius of the hydrogen atom respectively are

• a) 120, 31
• b) 30, 120
• c) 151, 31
• d) 31, 100

Answer: 120, 31

Question: Which of the following substances has the greatest ionic character ?

• a) BaCl₂
• b) NCl₃
• c) Cl₂O
• d) PbCl₂

Answer: BaCl₂

Question: Among the following species, identify the pair having same bond order CN^–, O₂ ^– , NO⁺, CN⁺

• a) CN^– and NO⁺
• b) CN^– and O₂^–
• c) CN^– and CN⁺
• d) None of these

Answer: CN^– and NO⁺

Question: Which of the following is not correct with respect to bond length of the species ?

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question:   The molecule which has the highest bond order is

• a) N₂
• b) O₂
• c) C₂
• d) B₂

Answer: N₂

Question: The compound which cannot be formed is

• a) He₂
• b) He
• c) Both
• d) None of these

Answer: He₂

Question:

• a) 3
• b) 1
• c) 0
• d) 2

Answer: 3

Question: Bond order in benzene is

• a) 1.5
• b) 1
• c) 2
• d) None of these

Answer: 1.5

Question:

• a) 7, 6, 8
• b) 6, 6, 6
• c) 1, 0, 2
• d) 8, 6, 8

Answer: 7, 6, 8

Question:

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question: Bond order normally gives idea of stability of a molecular species. All the molecules viz. H₂, Li₂ and B₂ have the same bond order yet they are not equally stable. Their stability order is

• a) None of these
• b)

  

• c)

  

• d) Both

Answer: None of these

Question:  According to MO theory which of the following lists ranks the nitrogen species in terms of increasing bond order?

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question: Hydrogen bonding would not affect the boiling point of

• a) HI
• b) H₂O
• c) NH₃
• d) None of these

Answer: HI

Question: Which one of the following molecules will form a linear polymeric structure due to hydrogen bonding?

• a) HF
• b) NH₃
• c) HCl
• d) H₂O

Answer: HF

Question: Which among the following can form intermolecular H – bonding ?

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

Answer:  B, C and D