Question

Which of the following is/are true regarding rate of reaction?

• A. It can depend on concentration of reactants.
• B. Presence of positive catalyst decreases the rate of reaction
• C. Rate of reaction does not depend on temperature
• D. Presence of positive catalyst increases the rate of reaction

Answer 1

Answer: (A), (D)

Presence of positive catalyst increases the rate of reaction

Factors affecting rate of reaction:

Effect of Concentration
From law of mass action, we know
$\text{Rate of reaction}\propto \text{Concentration of reactants}$
Generally, rate of reaction decreases with passage of time ,due to decrease in concentration of reactants.

Effect of temperature:
Most of the chemical reactions are accelerated by increase in temperature.

Effect of catalyst:
Presence of positive catalyst increases the rate of reaction.
Presence of negative catalyst decreases the rate of reaction.