Chapter U6, Problem 9STP

Interpretation Introduction

Interpretation:

The correct statement about reversible reaction needs to be determined.

Concept introduction:

Chemical kinetic is the branch of chemistry that deals with kinetic or rate of a chemical reaction. The rate of reaction can be defined as the change in the concentration of reactant and product with time. The rate of reaction mainly depends on the activation energy.

On the basis of direction, a chemical reaction can be classified as reversible and irreversible reaction. An irreversible reaction can proceed in one direction only whereas a reversible reaction proceeds in both directions.

Answer to Problem 9STP

Option (d) is correct.

Explanation of Solution

Reason for correct option:

In the rerversible reaction, reaction moves in both directions. The forward reaction converts the reactant molecule to product molecule and moves towards right. The backward reaction moves towards left side and converts products to reactant molecules. Both reactions occur at the same time.

Thus, a reversible reaction contains both reactant and product. When reaction reaches at equilibrium position, the rate of forward reaction is equal to rate of backward direction.

Conclusion

Reasons for incorrect options: reversible reaction has two parts; forward and backward reaction. Both reactions occur simultaneously, therefore, reactant and product is present in reversible reaction.

Thus option (A), (B) and (C) are incorrect.