Question

For a reversible system, when the concentration of the reacting system in equilibrium is increased then

• A. a forward reaction will take place.
• B. a backward reaction will take place.
• C. new equilibrium mixture will contain a higher concentration of the reactant.
• D. new equilibrium mixture will contain a lesser concentration of the product.

Answer 1

The correct option is A a forward reaction will take place.

Concentration is one of the factors which affects the chemical equilibrium of the reversible system.

• If the concentration of the reacting species is increased then as per Le Chatelier's principle equilibrium shifts to reduce the reactant concentration. A forward reaction will be favoured. The new equilibrium mixture will contain a higher concentration of the product.
• If the concentration of the reacting species is decreased then as per Le Chatelier's principle equilibrium shifts to increase the reactant concentration. A backward reaction will be favoured. The new equilibrium mixture will contain a higher concentration of the reactant.