Ionisation constant of CH₃COOH is 1.7 X 10^-5 and concentration of H⁺ ions is 3.4 X 10^-4.Then, find out initial concentration of CH₃COOH molecules.            

1. 3.4 X 10^-4 

2. 3.4 X 10^-3

3. 6.8 X 10^-4

4. 6.8 X 10^-3

 

The formation of phosgene is represented as,

            CO + Cl₂ $\rightleftharpoons$COCl₂

The reaction is carried out in 500 mL flask. At equilibrium o.3 mole of phosgene, 0.1 mole of CO and 0.1 mole of Cl₂ are present. The equilibrium constant of the reaction is:

1. 30                     

2. 15

3. 5                       

4. 3

For the equilibrium, PCl₅ $\rightleftharpoons$ PCl₃ + Cl₂,

${\mathrm{K}}_{\mathrm{C}}={\mathrm{\alpha }}^2/(1-\mathrm{\alpha })\mathrm{V}$, temperature remaining constant:

1. K_c will increase with the increase in volume

2. K_c will increase with the decrease in volume

3. K_c will not change with the change in volume

4. K_c may increase or decrease with the  change in volume depending upon its numerical value.

For the reaction,

  PCl₅(g) $\rightleftharpoons$PCl₃(g) + Cl₂ (g)

The forward reaction at constant temperature is favoured by:

1. Introducing an inert gas at a constant volume

2. Introducing chlorine gas at a constant volume

3. Introducing an inert gas at constant pressure

4. None of the above

In the dissociation of 2HI $\rightleftharpoons$H₂ + I₂, the degree of dissociation will be influenced by the:

1. Addition of inert gas at constant volume

2. Addition of inert gas at constant pressure

3. Increase of temperature

4. Increase of pressure

The correct order of increasing [H₃O⁺] in the following aqueous solutions is:

1. 0.01 M H₂S < 0.01 M H₂SO₄<0.01 M NaCl<0.01M NaNO₂

2. 0.01 M NaCl< 0.01 M NaNO₂<0.01 M H₂S< 0.01 M H₂SO₄

3. 0.01 M NaNO₂<0.01 M NaCl<0.01 M H₂S<0.01 M H₂SO₄

4. 0.01 M H₂S<0.01 M NaNO₂<0.01 M NaCl<0.01 M H₂SO₄

If the pressure of N₂ and H₂ mixture in a closed apparatus is 100 atm and 20% of the mixture then reacts, the pressure at  the same temperature would be:

1. 100                   

2. 90

3. 85                     

4. 80

The following reactions are known to occur in the body,

    CO₂ + H₂O$\rightleftharpoons$H₂CO₃$\rightleftharpoons$H⁺ + HCO₃^-                 

If CO₂ escapes from the system, then:

1. pH will decrease

2. hydrogen ion concentration will diminish

3. H₂CO₃ concentration will be unaltered

4. the forward reaction will be promoted

Which salt undergoes hydrolysis?

1. CH₃COONa                                     

2. KNO₃

3. NaCl                                               

4. K₂SO₄

Buffer solution among the following options is :           

1. HNO₂ and NaNO₂           

2. NaOH and NaCl

3. HNO₃ and NH₄NO₃         

4. HCl and KCl