Question

Which of the following is a factor that automobile engines use to increase the rate of its internal reactions?

(a) Concentration of fuel

(b) Viscosity of the fuel

(c) Surface area of the reactants

(d) Nature of the fuel

I had been asked this question in an interview for internship.

The query is from Chemical Kinetics in portion Chemical Kinetics of Chemistry – Class 12

Answer 1

Correct choice is (c) Surface area of the reactants

To explain I would say: Automobile engines cannot change the concentration, viscosity or the nature of the fuel. In the engines, fuel is injected in the form of microscopic droplets so that it has a larger surface area than when fed into the engine as a stream. This allows the fuel to burn rapidly.