1
###
Freezing point of an aqueous solution is (-0.186)°C

Freezing point of an aqueous solution is (-0.186)°C. Elevation of boiling point of the same solution is K_{b} = 0.512 °C, K_{f} = 1.86 °C, find the increase in boiling point.

- 0.186 °C
- 0.092 °C
- 0.0512 °C
- 0.2372 °C

2
###
The solubility product of a salt having general formula MX2

The solubility product of a salt having general formula MX_{2}, in water is 4 × 10^{–12}. The concentration of M^{2+} ions in the aqueous solution of the salt is

- 1.6 × 10
^{–4}M - 1.0 × 10
^{–4}M - 2.0 × 10
^{–6}M - 4.0 × 10
^{–10}M

3
###
The correct relationship between free energy change

The correct relationship between free energy change in a reaction and the corresponding equilibrium constant K_{c} is

- ΔG° = RT ln K
_{c} - -ΔG = RT ln K
_{c} - -ΔG = RT ln K
_{c} - -ΔG° = RT ln K
_{c}

4
###
Among the following acids which has the lowest pKa value

Among the following acids which has the lowest pKa value?

- HCOOH
- CH
_{3}CH_{2}COOH - (CH
_{3})_{2}CH–COOH - CH
_{3}COOH

5
###
Solubility product of silver bromide is 5.0x10^-13

Solubility product of silver bromide is 5.0x10^{-13}. The quantity of potassium bromide (molar mass taken as 120 g mol^{–1}) to be added to 1 litre of 0.05 M solution of silver nitrate to start the precipitation of AgBr is

- 6.2 x 10
^{-5}g - 5.0 x 10
^{-8}g - 1.2 x 10
^{-9}g - 1.2 x 10
^{-10}g