Chemical Equilibrium

1. Concentrations of reactants and products at equilibrium remain unchanged if ?

Concentration of any reactant or product is not changed

Temperature of reaction is not changed

Pressure or volume of the system is not changed

All of the above are observed

2. What is true about the equilibrium state?

The forward reaction stops.

The reverse reaction stops.

Both forward and reverse reactions stops.

Both forward and reverse reactions continue at the same rate.

3. When a mixture of H₂and I₂is sealed in a flask and temperature is kept at 25^oC? Which substance or substances will be present in the equilibrium mixture?

H2 and I2

H2 only

H2, I2 and HI

4. Which of the following does not happen, when system is at equilibrium?

Forward and reverse reaction stop.

Forward and reverse reaction become equal.

Concentration of reactant and product stop changing.

Reaction continues to occur in both directions

5. Active mass means?

Total mass of reactants

Total mass of products

Total mass of reactants and products

Mass of substance in mole per dm-3 in a dilute solution

6. For which reaction, Kc has units of mol.dm^-3?

Option 1

Option 2

Option 3

Option 4

7. Which of the following reactions will not have any units for Kc?

Option 1

Option 2

Option 3

All of these

8. In irreversible reaction, equilibrium is?

Established quickly

Established slowly

Never established

Established when reaction stops.

9. What are the units for?

Mol.dm-3

Mol2.dm6

Dm3.mol-1

No units

10. For a reversible reaction, Which substance is product of the reaction?

A

B

Both A and B

C