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

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

Among the following, the most acidic is :

• CH₃COOH

• ClCH₂COOH

• Cl₂CHCOOH

• Cl₂CHCH₂COOH

The solubility of CaF₂ in pure water is 2.3 × 10^-4 mol dm³. Its solubility product will be:

• 4.6 × 10^-4

• 4.6 × 10^-8

• 6.9 × 10^-12

• 4.9 × 10^-11

370.

Among BMe₃, BF₃, BCl₃ and B₂H₆ which one will be the best Lewis acid ?

• BCl₃

• BMe₃

• B₂H₆

• BF₃