Valence Bond Theory MCQs

Valence Bond Theory, introduced by Heitler and London, is grounded in quantum mechanics. According to this theory, covalent bonds are created when atomic orbitals from the valence shells of two atoms with unpaired electrons overlap. The strength of the covalent bond depends on the degree of this overlap: greater overlap leads to a stronger bond. The theory also accounts for the shape, hybridization, and directional characteristics of bonds in polyatomic molecules.

In which year was the Valence bond theory introduced?

(a) 1927
(b) 1920
(c) 1930
(d) 1935

The oxygen molecule is paramagnetic. It can be explained by

(a) Resonance
(b) Hybridization
(c) Valence bond theory
(d) Molecular orbital theory

Which of the following is correct for [Mn(CN)6]3-?

(a) dsp2 and square planar
(b) sp3d2 and octahedral
(c) d2sp3 and octahedral
(d) sp3d2 and tetrahedral

sp2 hybridisation is present in

(a) C2H2
(b) C2H4
(c) BeCl2
(d) C2H6

Hybridisation of [Ni(CN)4]2- is

(a) dsp2
(b) d2sp2
(c) sp3
(d) d2sp3

The hybridisation and geometry of XeF4 are

(a) sp3d2, square planar
(b) sp3d2, octahedral
(c) sp3d3, triangular planar
(d) sp3d, trigonal bipyramidal

Which of the following is true for the formation of stable bonds according to valence bond theory?

(a) Greater overlapping between atomic orbitals
(b) Close proximity between two atoms
(c) Pairing of electrons having opposite spins
(d) All of the above

Which of the following has sp3 hybridization?

(a) NF3, BF3
(b) SiF4, BeH2
(c) H2S, BF3
(d) NF3, H2O

s-orbitals are nondirectional because of

(a) spherical symmetry
(b) their small size
(c) being first orbital
(d) All of the above

Bond angle of 120° is found in

(a) PH3
(b) NCl3
(c) ClF3
(d) BCl3