At 25°C, the solubility product of salt of MX₂ type is 3.2 × 10^-8 in water. The solubility (in mol/L) of MX₂ in water at the same temperature will be

• 1.2 × 10^-3

• 2 × 10^-3

• 3.2 × 10^-3

• 1.75 × 10^-3

In SOCl₂, the Cl-S-Cl and Cl-S O bond angles are

• 130° and 115°

• 106° and 96°

• 107° and 108°

• 96° and 106°

In O₂ and H₂O₂ , the O-O bond lengths are 1.21 and 1.48 Å respectively. In ozone, the average O-O bond length is

• 1.28 Å

• 1.18 Å

• 1.44 Å

• 1.52 Å

The different colours of litmus in acidic, neutral and basic solutions are, respectively.

• red, orange and blue

• blue, violet and red

• red, colourless and blue

• red, violet and blue

The correct order of equivalent conductances at infinite dilution in water at room temperature for H⁺, K⁺, CH₃COO^- and HO^- ions is

• HO^- > H⁺ > K⁺ > CH₃COO^-

• H⁺ > HO^- > K⁺ > CH₃COO^-

• H⁺ > K⁺ > HO^- > CH₃COO^-

• H⁺ > K⁺ > CH₃COO^- > HO^-

The change of entropy (dS) is defined as

• $\mathrm{dS} = \frac{\mathrm{\delta q}}{\mathrm{T}}$

• $\frac{\mathrm{dH}}{\mathrm{T}}$

• $\mathrm{dS} = \frac{{\mathrm{\delta q}}_{\mathrm{rev}}}{\mathrm{T}}$

• $\mathrm{dS} = \frac{\mathrm{dH} - \mathrm{dG}}{\mathrm{T}}$

7.

For a chemical reaction at 27°C, the activation energy is 600 R. The ratio of the rate constants at 327°C to that of at 27°C will be

• 2

• 40

• e

• e²

A van der Waals' gas may behave ideally when

• the volume is very low

• the temperature is very high

• the pressure is very low

• the temperature, pressure and volume all are very high

In diborane, the number of electrons that accounts for bonding in the bridges is

• six

• two

• eight

• four

At 25°C, pH of a 10^-8 M aqueous KOH solution will be

• 6.0

• 7.02

• 8.02

• 9.02