731.

Which of the following pairs will show common ion effect?

• Barium chloride + Barium sulphate

• Silver cyanide + Potassium nitrite

• Ammonium hydroxide + Ammonium chloride

• Sodium chloride + Hydrogen chloride

Which of the following is the most basic ?

The unit of equilibrium constant for the following reaction is

 $2{\mathrm{NO}}_2\left(\mathrm{g}\right) \rightleftharpoons {\mathrm{N}}_2{\mathrm{O}}_4 \left(\mathrm{g}\right)$

• mol L^-1

• L mol^-1

• mol^-1 L^-1

• equilibrium constant is unitless

If the equilibrium constant for reaction (i) is 2, what is the equilibrium constant for reaction (ii)?

CO₂ $\leftrightharpoons$CO + $\frac{1}{2}{\mathrm{O}}_2 ....\left(\mathrm{i}\right)$

2CO₂ + O₂ $\rightleftharpoons$2CO₂ ...(ii)

• 1/4

• 1/2

• 1

• 2

For a gas in equilibrium with a liquid, the ratio of the concentration of the gas in the solution phase to that in the gaseous phase is constant at constant temperature, only if molecules undergo

• ionisation

• dissociation

• isolation

• reaction with solvent

Which of the following comments about the following equilibrium reaction is the most correct?

${\mathrm{H}}_2{\mathrm{SO}}_4\left(\mathrm{aq}\right) + {\mathrm{NH}}_3\left(\mathrm{aq}\right) \rightleftharpoons {\mathrm{HSO}}_4^{-} + {\mathrm{NH}}_4^{+}\left(\mathrm{aq}\right)$

• The equilibriumlies mostly to the right

• The equilibrium lies mostly to the left

• The equilibrium is exactly in between where the concentration of each of the reactants is exactly equal to the concentration of each of the products

• The equilibrium depends on the temperature of the equilibrium reaction

Which of the following represents the correct pH of a 10^-7 M HCl in doubly distilled air-free water?

• 6.6990

• 7.0000

• 7.3010

• 6.3980

The solubihty of AgI in NaI solution is less than that in pure water because

• Agl forms complex with Nal

• of common ion effect

• solubility product of AgI less

• the temperature of the solution decreases

Hydrogen ion concentration in mol/L in a solution of pH = 5.4 will be

• 3.98 × 10⁸

• 3.88 × 10⁶

• 3.68 × 10^-6

• 3.98 × 10^-6

XY₂ dissociated as XY₂(g) $\rightleftharpoons$XY(g) + Y (g) When the initial pressure of XY₂ is 600 mm Hg, the total equilibrium pressure is 800 mm Hg. Calculate K for the reaction assuming that the volume of the system remains unchanged.

• 50

• 100

• 166.6

• 400.0