Which of the following factors will speed up the rate of evolution of carbon (iv) oxide in the reaction below?

2HCl + CaCO3 → CaCl2 + H2O + CO2

A. Increasing the concentration of the acid
B. Increasing the surface area of CaCO3
C. A and B
D. Reducing the concentration of the acid

Correct Answer:

Option C – A and B

Explanation

The following factors increase the reaction rate:

– Increase in concentration of reactants
– Increase in temperature
– Addition of catalyst
– Increase in the surface area of reactant(s)