Question

If the rate law of a reaction is Rate $= K[A]^2 [B]^0$, then what will be the order of the reaction?

• A. Zero order
• B. First order
• C. Second order
• D. Third order

Hint:

Any concentration term raised to the power zero equals 1. So, $[B]^0 = 1$ and does not affect the rate of reaction.

Answer 1

The Correct Option is C

Step 1: Understanding Reaction Order
The order of a reaction with respect to a specific reactant is the power to which the concentration of that reactant is raised in the rate law equation. The overall order of the reaction is the sum of the powers of the concentration terms in the rate law expression.
Step 2: Calculation
Given Rate Law: \[ \text{Rate} = K[A]^2 [B]^0 \] The power of $[A]$ is $2$.
The power of $[B]$ is $0$.
Overall Order ($n$) = Sum of powers: \[ n = 2 + 0 = 2 \] Therefore, the reaction is of the second order.