Which of the following would increase the rate of this chemical reaction n2(g) + 3h2(g) > 2nh3(g)
i reduce the temperature
ii decrease the volume
iii introduce a catalyst
i only
i and ii
ii and iii
iii only

Decrease in temperature

Addition of catalyst (Fe)

III only

Explanation:

The rate of a chemical reaction (when reactant particles are gases) is increased by the following factors

The only correct option from the question is III

A catalyst increases the rate of chemical reaction by reducing the activation energy of the reaction. Activation energy is the minimum amount of energy required for a reaction to occur. So, when the activation energy is lowered, the time required to complete a reaction reduces, hence the rate of reaction increases.