Consider a reaction `2A +B to` Products. When the concentration of B alone was doubled, the half life did not change. When concentration of A alone was doubled, the rate increased by two times. The unit of rate constant for the reaction is:

Options

A. `s^(-1)`
B. `L "mon"^(-1)s^(-1)`
C. unitless
D. `"mol" L^(-1)s^(-1)`

Answer

B

Explanation

Concentration change is 'B' does not change hlf life, it means the reactions is first order with respect to B. When concentration of only 'A' is doubled, the rate of reaction becomes double , thus order with respect to a will also be one.
Overall order of reaction =2
Unite of rate constant =`L "mol"^(-1) s^(-1)`