Chemistry : Chemical Bonding and Molecular Structure

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

Fluorine reacts with dilute NaOH and forms a gaseous product A. The bond angle in the molecule of A is

• 104°40'

• 103°

• 107°

• 109°28'

The number of p$\mathrm{\pi }$-d$\mathrm{\pi }$ 'pi' bonds present in XeO₃ and XeO₄ molecules, respectively are-

• 3, 4

• 4, 2

• 2, 3

• 3, 2

Which one of the following sets correctly represents the increase in the paramagnetic property of the ions?

• Cu²⁺ > V²⁺ > Cr²⁺ > Mn²⁺

• Cu²⁺ < Cr²⁺ < V²⁺ < Mn²⁺

• Cu²⁺ < V²⁺ < Cr²⁺ < Mn²⁺

• V²⁺ < Cu²⁺ < Cr²⁺ < Mn²⁺

Dipole moment of HCl = 1.03 D, HI= 0.38 D. Bond length of HCl = 1.3 Å and HI = 1.6 Å. The ratio of fraction of electric charge, δ, existing on each atom in HCl and HI is

• 12 : 1

• 2.7 : 1

• 3.3 : 1

• 1 : 3.3