Chemical Equilibrium MCQ - 1 (Advanced)

If is found that the equilibrium constant increases by factor of four when the temperature is increased from 25°C to 40°C. The value of ΔH° is

Ammonium carbamate dissociates as follows :

NH₂COONH₄(s)  2NH₃(g) + CO₂(g)

The value of K_P for this reaction is found to be equal to 2.92 × 10^-5 atm³. If one mole of ammonium carbamate is heated in a sealed container, the total pressur develped in the container is

The equilibrium constant for the following reactions at 1400 K are given.

2H₂O(g) 2H₂(g) + O₂(g) ; K₁=2.1×10^-13

2CO₂(g)2CO(g)+O₂(g);K₂ = 1.4 × 10^-12

Then, the equilibrium constant K for the reaction

H₂(g) + CO₂(g)  CO(g) + H₂O(g) is

Under what conditions of temperature and pressure, the formation of atomic hydrogen from molecular hydrogen will be favoured most ?

For the reaction PCl₅(g)  PCl₃(g) + Cl₂(g), the forward reaction at constant temperature is favoured by

When NaNO₃(s) is heated in a closed vessel, oxygen is liberated and NaNO₂(s) is left behind. At equilibrium.

Phase diagram of CO₂ is shown as following

Based on above find the correct statement (s)

The equilibrium between, gaseous isomers A, B and C can be represented as

Reaction                                           Equilibrium constant

A(g)  B (g)                            : K₁ = ?

B(g)  C(g)                             : K₂ = 0.4

C(g)  A(g)                             : K₃ = 0.6

If one mole of A is taken in a closed vessel of volume 1 litre, then

For the gas phase exothermic reaction.

A₂ + B₂  C₂, carried out in a closed vessel, the equilibrium moles of A₂ can be increased by

Consider the equilibrium

HgO(s) + 4I^- (aq) + H₂O(l) Hg I₄^2- (aq) + 2OH^- (aq), which changes will decrease the equilibrium concentration of HgI₄^2-

In the laboratory the equilibrium constant for a particular reaction can be measured at different temperatures. Plotting the data yields the graph shown. Which of the following statements is false?

(Note : The notation 4.40 e^- 4 is equivalent to 4.40 × 10^-4)

Decrease in the pressure for the following equilibria : H₂O (s)  H₂O(l) result in the :

Statement-1 : Water boils at high temperature in pressure cooker.

Statement-2 : Increase in pressure leads to an increase in boiling point.

Statement-1 : A decrease in pressure leads to an increase in freezing point of water.

Statement-2 : For ice on melting volume decreases.

Statement-1 : The solubility of gases always increases with increase in pressure.

Statement-2 : High pressure favours the change where volume of gas decreases.

Statement-1 : Total number of moles in a closed system at new equilibrium is less than the old equilibrium if some amount of a substance is removed from a system.

A(g)  B(g) equilibrium.

Statement-2 : The number of moles of the substance which is removed, is partially compensated as the system reached to new equilibrium.

Statement-1 : An exothermic reaction, non-spontaneous at high temperature, may become spontaneous at low temperature.

Statement-2 : Entropy of an exothermic reaction always decrease with decrease in temperature.

Statement-1 : Ammonia at a pressure of 10 atm and CO₂ at a pressure of 20 atm are intoduced into an evacuated chamber. If K_p for the reaction.

NH₂COONH₄(s)  2NH₃(g) + CO₂(g) is 2020 atm³, the total pressure after a long time is less than 30 atm.

Statement-2 : Equilibrium can be attained from both directions.

In a 7.0 L evacuated chamber, 0.50 mol H₂ and 0.50 mol I₂ react at 427°C

H₂(g) + I₂ (g)  2HI(g). At the given temperature, K_c = 49 for the reaction.

What is the value of K_p ?

In a 7.0 L evacuated chamber, 0.50 mol H₂ and 0.50 mol I₂ react at 427°C

H₂(g) + I₂ (g)  2HI(g). At the given temperature, K_c = 49 for the reaction.

What is the total pressure (atm) in the chamber

In a 7.0 L evacuated chamber, 0.50 mol H₂ and 0.50 mol I₂ react at 427°C

H₂(g) + I₂ (g)  2HI(g). At the given temperature, K_c = 49 for the reaction.

How many moles of the iodine remain unreacted at equilibrium ?

In a 7.0 L evacuated chamber, 0.50 mol H₂ and 0.50 mol I₂ react at 427°C

H₂(g) + I₂ (g)  2HI(g). At the given temperature, K_c = 49 for the reaction.

What is the partial pressure (atm) of HI in the equilibrium mixture ?