At a certain temperature, 2HI $\rightleftharpoons$H₂ +I₂ only 50% HI is dissociated at equilibrium. The equilibrium constant is:

(a) 1.0                     (b) 3.0                 (c) 0.5               (d)   0.25

In the reaction, PCl₅$\rightleftharpoons$PCl₃ + Cl₂, the amounts of PCl₅, PCl₃ and Cl₂ at equilibrium are 2 mole each and the total pressure is 3 atm. The equilibrium constant K_p is:

(a) 1.0 atm                                        (b) 2.0 atm

(c) 3.0 atm                                        (d) 6.0 atm

On addition of an inert gas at constant volume to the reaction, N₂ + 3H₂$\rightleftharpoons$2NH₃ at  equilibrium:

(1) the reaction halts

(2) forward reaction is favoured

(3) the reaction remains unaffected

(4) backward reaction is favoured

In which of the following case reaction goes farthest to completion?

(1) K=10³                                         

(2) K=10^-2

(3) K=10                                           

(4) K=10⁰

For the reversible reaction,

N₂ (g) + 3H₂(g) $\rightleftharpoons$2NH₃ (g) + heat

 the equilibrium shifts in forward direction                                   

(1) by increasing the concentration of NH₃ (g) 

(2) by decreasing the pressure

(3) by decreasing the concentrations of N₂ (g)and H₂(g)

(4) by increasing pressure and decreassing temperature

Which is the strongest acid in the following?          

(a) H₂SO₄            (b) HClO₃        (c) HClO₄         (d) H₂SO₃ 

The conjugate acid of NH₂^- is                           

(a) N₂H₄      (b) N${\mathrm{H}}_4^{+}$       (c) NH₄OH        (d) NH₃

A 50 ml solution of strong acid of pH = 1 is mixed with a 50 ml solution of strong acid of pH=2. The pH of the mixture will be nearly:                                                     

(log 5.5 = 0.74)

1. 0.74                   2. 1.26

3. 1.76                   4.  1.5

The pH of a solution obtained by mixing 50ml of 0.4N HCl and 50ml of 0.2M NaOH is:

(1) 13

(2) 12

(3) 1.0

(4) 2.0

In which of the following reaction the value of K_p will be equal to K_c ?

$1. {\mathrm{N}}_2\left(\mathrm{g}\right) + {\mathrm{O}}_2\left(\mathrm{g}\right) \rightleftharpoons 2\mathrm{NO}\left(\mathrm{g}\right)$

$2. {\mathrm{PCl}}_5\left(\mathrm{g}\right)\rightleftharpoons {\mathrm{PCl}}_3\left(\mathrm{g}\right) + {\mathrm{Cl}}_2\left(\mathrm{g}\right)$

$3. 2{\mathrm{NH}}_3\left(\mathrm{g}\right)\rightleftharpoons {\mathrm{N}}_2\left(\mathrm{g}\right) +3{\mathrm{H}}_2\left(\mathrm{g}\right)$

$4. 2{\mathrm{SO}}_2\left(\mathrm{g}\right) + {\mathrm{O}}_2\left(\mathrm{g}\right) \rightleftharpoons 2{\mathrm{SO}}_3\left(\mathrm{g}\right)$