Question

Which of the following will increase the rate of the reaction?

• A. Addition of negative catalyst
• B. Increasing reactant concentration
• C. Cooling the reaction
• D. None of the above

Answer 1

The correct option is B Increasing reactant concentration

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. Thus cooling the system will decrease the rate of the reaction.

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