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Questions on topic Equillibrium from Class 12 CBSE Chemistry

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Q1. What is the condition for a chemical reaction to be at equilibrium?

The concentrations of reactants and products are equal.

The rate of the forward reaction equals the rate of the reverse reaction.

All reactants must be completely converted to products.

The system must be at high temperature.

Q2. Which of the following is true about dynamic equilibrium?

It occurs only in closed systems.

The concentrations of reactants and products remain constant.

Both forward and reverse reactions continue to occur.

All of the above.

Q3. In the equilibrium expression for a reaction, which of the following is not included?

Products

Reactants

Solids

Gases

Q4. For the reaction: aA + bB ⇌ cC + dD, the equilibrium constant Kc is given by:

[C]^c[D]^d / [A]^a[B]^b

[A]^a[B]^b / [C]^c[D]^d

[A]^a + [B]^b / [C]^c + [D]^d

1 / Kp

Q5. Which factor does not affect the position of equilibrium?

Concentration of reactants/products

Temperature

Catalyst

Pressure

Q6. Le Chatelier's principle states that if a system at equilibrium is subjected to a change in concentration, temperature, or pressure, the system will:

Shift in the direction that opposes the change.

Always move to the right.

Always move to the left.

Remain unchanged.

Q7. What happens to the equilibrium position when the temperature of an exothermic reaction is increased?

Shifts to the left.

Shifts to the right.

No change.

Increases the value of Kc.

Q8. The equilibrium constant Kp is used for reactions involving:

Only solids.

Only liquids.

Only gases.

All phases.

Q9. In a reaction at equilibrium, increasing the pressure will shift the equilibrium position toward:

The side with more moles of gas.

The side with fewer moles of gas.

No side.

The side with solids.

Q10. Which of the following is a characteristic of a reversible reaction?

It can only go in one direction.

It reaches completion.

It can attain a state of dynamic equilibrium.

It requires a catalyst.

Questions on topic Equillibrium from Class 12 CBSE Chemistry

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