Question

Among the following which will decrease the rate of the reaction?
i. Using highly concentrated reactants
ii. Decreasing the temperature by $25K$
iii. Stirring the reactants

• A. i only
• B. ii only
• C. i and iii only
• D. ii and iii only
• E. i, ii, and iii

Answer 1

The correct option is B ii only

$\bullet$ Using highly concentrated reactants will increase the rate of the reaction as rate is directly proportional to the

concentration of reactants.

$\bullet$ Decreasing the temperature by 25 K will decrease the rate constant and hence the rate of reaction will decrease.

$\bullet$ Stirring the reactants increases the rate of interaction between the reactants and hence the rate of reaction increases.

$\therefore$ The correct answer is (ii) only.