Question

For a reaction A + B → C + D, the rate equation is given by, r = k[A] [B],

1. What is the order of the above reaction?

2. Find the unit of k in the above rate equation.

3. What happens to the order of the reaction if ‘B’ is taken in large excess?

Answer 1

1. 2^nd order

2. L mol^-1s^-1

3. If B is taken in large excess, the reaction behaves as 1^st order reaction. Such reactions are called pseudo 1^st order reactions.