181.

Which of the following is a linear molecule?

• BeCl₂

• H₂O

• SO₂

• CH₄

A molecule (X) has 

(i) four sigma (σ) bonds formed by the overlap of sp² and s orbitals

(ii) one sigma (σ) bond formed by sp² and sp² orbitals and 

(iii) one $\mathrm{\pi }$ bond formed by p_x and p_z orbitals.

Which of the following is X?

• C₂H₆

• C₂H₃Cl

• C₂H₂Cl₂

• C₂H₄

The bond length of HCl molecule is 1.275 Å and its dipole moment is 1.03 D. The ionic character of the molecule (in percent) (charge of the electron = 4.8 × 10^-10 esu) is

• 100

• 67.3

• 33.66

• 16.83

Which one of the following is a correct set ?

• H₂O, sp³, angular

• BCl₃, sp³, angular

• NH${}_4^{+}$, dsp², square planar

• CH₄, dsp², tetrahedral

The number of sigma and pi bonds in peroxodisulphuric acid are, respectively

• 9 and 4

• 11 and 4

• 4 and 8

• 4 and 9

The compound in which the number of d$\mathrm{\pi }$-p$\mathrm{\pi }$ bonds are equal to those present in ClO${}_4^{-}$

• XeF₄

• XeO₃

• XeO₄

• XeF₆

The decreasing order of bond dissociation energies of C-C, C-H and H-H bonds is

• H-H > -C-H> -C-C-

• -C-C- > C-H> H-H

• -C-H >-C-> H-H

• C-C- > H-H > -C-H

Hybridisation of oxygen in diethyl ether is

• sp

• sp²

• sp³

• sp³d

Which of the following is not tetrahedral ?

• ${\mathrm{BF}}_4^{-}$

• ${\mathrm{NH}}_4^{+}$

• ${\mathrm{CO}}_3^{2-}$

• ${\mathrm{SO}}_4^{2-}$

Given that $∆$H_f (H) = 218 kJ/ mol, express the H-H bond energy in kcal/ mol.

• 52.15

• 911

• 104.3

• 52153