Question

When the two reactants are in the same phase, then which common phase will ensure that the products are formed at the fastest pace?

(a) Solid

(b) Liquid

(c) Gas

(d) The rate of a reaction is independent of the phase of the reactants

The question was posed to me at a job interview.

Question is taken from Chemical Kinetics topic in chapter Chemical Kinetics of Chemistry – Class 12

Answer 1

Right choice is (c) Gas

Best explanation: When two reactants are in the same phase, it is better for the speed if the reaction if they are in a gaseous phase as the particles are free to move and can collide more frequently with each other, resulting in a chemical reaction.