The reaction quotient 'Q' is useful in predicting the direction of the reaction. Which of the following is incorrect?

• If Q_c < K_c, the forward reaction is favoured

• If Q_c > K_c, the forward reaction is favoured

• If Q_c >K_c, the forward reaction is favoured and Q_c =K_c, no reaction occur.

• None of these

pH of 1M NH₃ aqueous solution is (K_b = 1.8 × 10^-5)

• 11.13

• 12.5

• 13.42

• 11.55

Equivalent weight of an acid :

• depends on the reaction involved

• depends upon the number of oxygen atoms present

• is always constant

• None of the above

Two moles of PCl₅ were heated in a closed vessel of 2 L. At equilibrium, 40% of PCl₅ is dissociated into PCl₃ and Cl₃. The value of equilibrium constant is :

• 0.53

• 0.267

• 2.63

• 5.3

695.

The solubility product of Barium sulphate is 1.5 × 10^-9 at 18°C. Its solubility in water at 18°C is :

• 1.5 × 10^-9

• 1.5 × 10^-5

• 3.9 × 10^-9

• 3.9 × 10^-5

pH scale was introduced by :

• Arrhenius

• Sorensen

• Lewis

• Lowry

Which one of the following is called amphoteric solvent ?

• Ammonium hydroxide

• Chloroform

• Benzene

• Water

100 mL of 0.04 N HCl aqueous solution is mixed with 100 mL of 0.02 N NaOH solution. The pH of the resulting solution is

• 1.0

• 1.7

• 2.0

• 2.3

If a system is at equilibrium, the rate of forward to the reverse reaction is :

• less

• equal

• high

• at equilibrium

The equilibrium constant for the reaction N₂(g) + O₂(g) $\rightleftharpoons$2NO(g) is 4×10^-4 at 200K. In presence of a catalyst the equilibrium is attained ten times faster. Therefore the equilibrium constant in presence of catalyst 2000 K is 

• 4×10^-3

• 4×10^-2

• 40×10^-4

• 4×10^-4