MCQs on Valence Bond Theory

MCQs on Valence Bond Theory

1. In which year was the Valence bond theory introduced?

(a) 1927

(b) 1920

(c) 1930

(d) 1935

2. The oxygen molecule is paramagnetic. It can be explained by

(a) Resonance

(b) Hybridisation

(c) Valence bond theory

(d) Molecular orbital theory

3. Bond angle of 120° is found in

(a) PH₃

(b) NCl₃

(c) ClF₃

(d) BCl₃

4. Which of the following has sp³ hybridisation?

(a) NF₃, BF₃

(b) SiF₄, BeH₂

(c) H₂S, BF₃

(d) NF₃, H₂O

5. Hybridisation of [Ni(CN)₄]^2- is

(a) dsp²

(b) d²sp²

(c) sp³

(d) d²sp³

6. 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

7. s-orbitals are nondirectional because of

(a) spherical symmetry

(b) their small size

(c) being first orbital

(d) All of the above

8. sp² hybridisation is present in

(a) C₂H₂

(b) C₂H₄

(c) BeCl₂

(d) C₂H₆

9. The hybridisation and geometry of XeF₄ are

(a) sp³d², square planar

(b) sp³d², octahedral

(c) sp³d³, triangular planar

(d) sp³d, trigonal bipyramidal

10. 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

Answer

1. (a)	2. (d)	3. (d)	4. (d)	5. (a)
6. (c)	7. (a)	8. (b)	9. (b)	10. (d)