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

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

Which one of the following is called amphoteric solvent ?

• Ammonium hydroxide

• Chloroform

• Benzene

• Water

335.

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

At a given temperature the equilibrium constant for the reaction of:

PCl₅ $\rightleftharpoons$ PCl₃ + Cl₂ is 2.4 × 10^-3. At the same temperature, the equilibrium constant for the reaction

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

• 2.4 × 10^-3

• -2.4 × 10^-3

• 4.2 × 10²

• 4.8 × 10^-2

For the gaseous reaction, C₂H₄ + H₂ $\rightleftharpoons$ C₂H₆; $∆$H = -130 kJ mol^-1 carried in a closed vessel, the equilibrium concentration of the C₂H₆ can definitely be increased by:

• increasing temperature and decreasing pressure

• decreasing temperature and increasing pressure

• increasing temperature and pressure both

• decreasing temperature and pressure both

Which of the following is correct for the reaction?

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

• K_p = K_c

• K_p < K_c

• K_p > K_c

• Pressure is required to predict the correlation