Q78 / 200 · NEET 2023 (All India) · Chemistry

For a certain reaction, the rate =k [A]2 [B], when the initial concentration of A is tripled keeping concentration of B constant, the initial rate would 

  • A
    increase by a factor of three.
  • B
    decrease by a factor of nine.
  • C
    increase by a factor of six.
  • Correct answer
    D
    increase by a factor of nine.

Solution

The rate law is : rate = \(k[A]^2 \left[B\right]\)...(1)

The rate of the reaction when the concentration of A is Trippled and B is kept constant:

r1=k3A2B

r1=9kA2B.....(2)

From equation first and second:

r1= 9r

Thus, the rate is increased by a factor of 9.

Hence, the correct answer is option: 'D'.

Relevant Questions