CBSE Class 11 Chemistry Chemical Bonding and Molecular Structure MCQs Set 02

Question: The correct order of dipole moments of HF, H₂S and H₂O is
a) HF < H₂S < H₂O
b) HF < H₂S < H₂O
c) HF < H₂S < H₂O
d) HF < H₂O < H₂S
Answer: a

Question: The most polar bond is
a) C – F
b) C – O
c) C – Br
d) C – S
Answer: a

Question: A square planar complex is formed by hybridisation of the following atomic orbitals 
a) s, p_x, P_y , Pz
b) s, px, Py, Pz, d
c) d, S, P_x, P_y
d) s, P_x, Py, p_z, d, d
Answer: c

Question: The attractive force which holds various constituents (atoms, ions etc.) together in different chemical species is called a
a) chemical bond
b) chemical compound
c) ionic bond
d) covalent bond
Answer: a

Question: Among the following which compound will show the highest lattice energy ?
a) KF
b) NaF
c) CsF
d) RbF
Answer: b

Question: Which of the following hydrogen bonds are strongest in vapour phase? 
a) HF ...... HF
b) HF ..... . HCI
c) HCI. ..... HCI
d) HF ...... Hl
Answer: a

Question: Resonance is due to
a) delocalization of sigma electrons
b) delocalization of pi electrons
c) migration of protons
d) Both delocalization of sigma electrons and delocalization of pi electrons
Answer: b

Question: The lowest energy structure is the one with the .......... formal charges on the atoms.
a) smallest
b) highest
c) zero
d) negative
Answer: a

Question: The number of lone pairs of Xe in XeF₂ , XeF₄ and XeF₆ respectively are 
a) 3,2, l
b) 2,4, 6
c) 1,2,3
d) 6,4,2
Answer: a

Question: The effect of more electronegative atom on the strength of ionic bond
a) increases
b) decreases
c) remains the same
d) decreases slowly
Answer: a

Question: When a metal atom combines with non-metal atom, the non-metal atom will
a) lose electrons and decrease in size
b) lose electrons and increase in size
c) gain electrons and decrease in size
d) gain electrons and increase in size
Answer: d

Question: According to Fajan’s rule, covalent bond is favoured by
a) Large cation and small anion
b) Large cation and large anion
c) Small cation and large anion
d) Small cation and small anion
Answer: c

Question: In PO₄^3– ion, the formal charge on each oxygen atom and P—O bond order respectively are
a) –0.75, 0.6
b) – 0.75, 1.0
c) – 0.75, 1.25
d) –3, 1.25
Answer: c

Question: Which of the following statement is correct?
a) Amount of energy required to break one mole of bonds of a particular type between two atoms in a gaseous state is called bond enthalpy.
b) The unit of bond enthalpy is kJ mol^–1
c) Larger the bond dissociation enthalpy, stronger will be the bond in the molecule
d) All of the options
Answer: d

Question: Unusually high boiling point of water is result of
a) intermolecular hydrogen bonding 
b) intramolecular hydrogen bonding
c) both intra and inter molecular hydrogen bonding
d) high specific heat
Answer: a

Question: Which of the following compounds does not follow the octet rule for electron distribution?
a) PCl₅
b) PCl₃
c) H₂O
d) PH₃
Answer: a

Question: Which molecule has hydrogen bonding?
a) CH₄
b) CH₃COOH
c) GeH₄
d) H₂Te
Answer: b

Question: In which of the following molecules octet rule is not followed?
a) NH₃
b) CH₄
c) CO₂
d) NO
Answer: d

Question: H-bond is not present in
a) water
b) glycerol
c) hydrogen fluoride
d) hydrogen sulphide
Answer: d

Question: Which of the following has dipole moment?
a) CO₂
b) p-dichlorobenzene
c) NH₃
d) CH₄
Answer: c

Question: Which of the following molecules bas pyramidal shape?
a) PCI₃
b) SO₃
c) CO₃^2-
d) NO^-₃
Answer: a

Question: In the cyanide ion, the formal negative charge is on
a) C
b) N
c) Both C and N
d) Resonate between C and N
Answer: b

Question: Malleability and ductility of metals can be accounted due to
a) the presence of electrostatic force
b) the crystalline stmcture in metal
c) the capacity of layers of metal ions to slide over the other
d) the interaction of electrons with metal ions in the lattice
Answer: c

Question: Which of the following combination will form an electrovalent bond ?
a) P and Cl
b) NH₃ and BF₃
c) H and Ca
d) H and S
Answer: c

Question: In N₂molecule, the number of electrons shared by each nitrogen atom is
a) 1
b) 2
c) 3
d) 5
Answer: c

Question: Which of the following compounds would have the highest boiling point ? 
a) CH₃CH₂CH₂CH₃
b) CH₃NH₂
c) CH₃OH
d) CH₂F₂
Answer: c

Question: Who introduced the term covalent bond ?
a) Lewis
b) Langmuir
c) Nyholm and Gillespie
d) Heitler and London
Answer: b

Question: Which of the following bond will have highest ionic character?
a) H–I
b) H–F
c) H–Cl
d) H–Br
Answer: b

Question: The evolution of various theories of valence and the interpretation of the nature of chemical bonds have closely been related to the developments in the understanding of
a) structure of atom
b) electronic configuration of elements
c) periodic table
d) All of the options
Answer: d

Question: In ionic solids how crystal structure get stabilized
a) By the energy released in the formation of crystal lattice.
b) By achieving octet of electrons around the ionicspecies in gaseous state. 
c) By electron gain enthalpy and the ionization enthalpy.
d) None of the options
Answer: a

Question: Which of the following statements is incorrect ?
a) The formation of ionic compounds depend upon the ease of formation of the positive and negative ions from the respective neutral atoms.
b) Formation of ionic compounds depend upon arrangement of the positive and negative ions in the solid.
c) Formation of positive ion involves addition of electron(s) while that of negative ion involves removal of electron(s).
d) None of the options
Answer: c

Question: Energy required to completely separate one mole of a solid ionic compound into gaseous constituent ions is called .......... .
a) Ionisation enthalpy
b) Electron gain enthalpy
c) Bond dissociation enthalpy
d) Lattice enthalpy
Answer: d

Question: Polarisibility of halide ions increases in the order
a) F ^–, I ^–, Br^–, Cl^–
b) Cl ^–, Br –, I^–, F^–
c) I ^–, Br ^–, Cl^–, F^–
d) F ^–, Cl ^–, Br^–, l^–
Answer: d

Question: .......... is measured as the radius of an atom’s core which is in contact with the core of an adjacent atom in a bonded situation.
a) van der Waal’s radius
b) Bond length
c) Covalent radius
d) Ionic radius
Answer: c

Question: CO₂ is isostructural with
a) C₂H₂
b) SnCl₂
d) MgCl₂
c) NO₂
Answer: a

Question: Glycerol is more viscous than ethanol due to 
a) high molecular weight
b) high boiling point
c) many hydrogen bonds per molecule
d) Fajan's rule
Answer: c

Question: Among the following the electron deficient compound is
a) BCl₃
b) CCl₄
c) PCl₅
d) BeCl₂
Answer: a

Question: Which one of the following is not the resonance structure of CO₂?
a) O = C = O
b) ^– O – C ≡ O⁺
c) ⁺ O ≡ C – O^–
d) O ≡ C = O
Answer: d

Question: All the bond lengths of sulphur – oxygen in sulphate ion, are equal because of:
a) symmetry
b) resonance
c) high electronegativity of oxygen
d) None of the options
Answer: b

Question: Pair of species having identical shapes for molecules is
a) CF₄, SF₄
b) BF₃, PCI₃ 
c) XeF₂, CO₂ 
d) PF₅, IF₇
Answer: c