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11.

Mention a reversible reaction.

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12.

What is the role of forward and backward reactions at equilibrium of a reversible reaction?

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13.

What is a forward reaction?

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14.

What condition favours a reversible reaction?

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15.

What is a backward reaction?

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16.

What type of equilibrium is attained in a reversibe chemical change?

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17.

What is meant by a system at dynamic equilibrium?

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18.

discuss the effect of a catalyst on equilibrium ?

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19. At equilibrium, the mass of each of the reactants and products remains constant. Does it mean that the reaction has stopped? Explain.

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20. What is the effect of a catalyst on the position of equilibrium?

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