NEET2023ChemistryChemical KineticsActual
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
Options
- Aincrease by a factor of three.
- Bdecrease by a factor of nine.
- Cincrease by a factor of six.
- Dincrease by a factor of nine.
Correct answer
D. increase by a factor of nine.
Step-by-step solution
The rate law is : rate = (k[A]^2 [B ] )...(1) The rate of the reaction when the concentration of A is Trippled and B is kept constant: r 1 = k 3 A 2 B r 1 = 9 k A 2 B .....(2) From equation first and second: r 1 =   9 r Thus, the rate is increased by a factor of 9.