Chemistry : Equilibrium

The pH of a 0.02 M NH₄Cl solution will be: [ given K_b(NH₄OH) = 10^-5 and log 2= 0.301]

• 5.35

• 2.65

• 4.65

• 4.35

For the reaction, 2SO₂(g) + O₂(g) $\rightleftharpoons$2SO₃(g), ΔH= -57. 2kJ mol^-1 and K_c = 1.7 × 10⁶. Which of the following statement is INCORRECT ?

• The equilibrium constant is large suggestive of reaction going to completion and so no catalyst is required

• The equilibrium constant decreases as the temperature increases.

• The equilibrium will shift in forward direction as the pressure increase

• Volume will not affect the equilibrium constant

The addition of a catalyst during a chemical reaction alters which of the following quantities ?

• Internal energy

• Enthalpy

• Activation energy

• Activation energy

Which one of the following characteristics is associated with adsorption?

• ΔG, ΔH and  ΔS all are negative

• ΔG and  ΔH are negative but  ΔS is positive

• ΔG and  ΔS are negative but  ΔH is positive

• ΔG and  ΔS are negative but  ΔH is positive

MY and NY₃, two nearly insoluble salts. have the same K_sp values of 6.2 x 10^-13 at room temperature. Which  statement would be true in regard to MY and NY₃ ?

• The molar solubility of MY in water is less than that of NY₃

• The salts MY and NY₃ are more soluble in 0.5 M KY than in pure water

• The addition of the Salt of KY to the solution of MY and NY₃ will have no effect on their solubilities.

• The addition of the Salt of KY to the solution of MY and NY₃ will have no effect on their solubilities.

Consider the following liquid-vapour equilibrium


Which of the following relations is correct?

If the value of an equilibrium constant ofr particular reaction is 1.6 x10¹² then at equilibrium the system will contains

• all reactants

• mostly reactants

• mostly products

• mostly products

The K_sp of Ag₂CrO₄, AgCl, AgBr and AgI are respectively, 1.1 x 10^-12, 1.8 x 10^-11, 8.3 x 10^-17. Which one of the following salts will precipitate last if AgNO₃ solution is added to the solution containing equal moles of NaCl, NaBr, NaI and Na₂CrO₄? 

• AgI

• AgCl

• AgBr

• AgBr

Which of the following salts will give highest pH in water?

• KCl

• NaCl

• Na₂CO₃

• Na₂CO₃

For the reversible reaction,


the equilibrium shifts in the forward direction

• by increasing the concentration of NH₃ (g)

• by decreasing the pressure

• by decreasing the concentrations of N₂ (g)  and H₂(g)

• by decreasing the concentrations of N₂ (g)  and H₂(g)