Question

The following data pertain to the reaction between A and B:
S.No.$\left[A\right]mol.L^{-1}\left[B\right]mol.L^{-1}Ratemol.L^{-1}.t^{-1}$
I$1\times {10}^{-2}2\times {10}^{-2}2\times {10}^{-4}$
II$2\times {10}^{-2}2\times {10}^{-2}4\times {10}^{-4}$
III$2\times {10}^{-2}4\times {10}^{-2}8\times {10}^{-4}$
Which of the following inference(s) can be drawn from the above data
[a]rate constant of the reaction is ${10}^{-4}$
[b]rate law of the reaction is $k\left[A\right]\left[B\right]$
[c]rate of reaction increases four times on doubling the concentration of both the reactants
Select the correct answer:

• A. a, b and c
• B. a and b
• C. b and c
• D. None of the above

Answer 1

Answer: (C)

b and c

From data, it can be seen that,

the reaction is first order with respect to A and first order w.r.t. to B.

so,

rate law $r=k\left[A\right]\left[B\right]$.

and the rate of reaction increases four times on doubling the concentration of both the reactants.