In the formation of SO₃ according to following equilibrium 2SO₂ + O₂ $\rightleftharpoons$ 2SO₃ + heat, which conditions favour the formation of SO₃?

• Low pressure

• Low concentration of oxygen

• Low temperature and use of catalyst

• High temperature without using catalyst

Which of the following mixtures forms an acid buffer?

• NaOH + HCl

• CH₃COOH + CH₃COONa

• NH₄OH + NH₄Cl

• H₂CO₃ + (NH₄)₂CO₃

When NH₄Cl is added to NH₄OH solution, the dissociation of ammonium hydroxide is reduced. It is due to

• common ion effect

• hydrolysis

• oxidation

• reduction

Strongest Bronsted base among the following anions is

• ClO^-

• ClO${}_2^{-}$

• ClO${}_3^{-}$

• ClO${}_4^{-}$

565.

pH of a solution is 4. The hydroxide ion concentration of the solution would be

• 10^-4

• 10^-10

• 10^-2

• 10^-12

Heat of neutralisation of NH₄OH and HCl is

• equal to 13.7 kcal

• more than 13.7 kcal

• less than 13.7 kcal

• more than one is correct

A chemical reaction is in equilibrium when

• the reactants are completely transformed into products

• the rate of forward reaction is equal to the rate of backward reaction

• the formation of products is minimised

• equal amount of reactants and products are present

For the following gaseous reaction, H₂ + I₂ $\rightleftharpoons$2HI, the equilibrium constant

• K_p > K_c

• K_p< K_c

• K_p= K_c

• K_p= 1/K_c

According to Le-Chatelier's principle which of the following factors influence a chemical system?

• Concentration only

• Pressure only

• Temperature only

• Concentration, pressure and temperature

The pH of water decreases with?

• increase in temperature

• increase in pressure

• decrease in temperature

• decrease in pressure