Question

For a reaction $A+B\to C+D$, if concentration of A is doubled without altering that of B, rate doubles. If concentration of B is increased nine times without altering that of A, rate triples. Order of the reaction is :

• A. 1
• B. 2
• C. $1\frac{1}{2}$
• D. $1\frac{1}{3}$

Answer 1

The correct option is C $1\frac{1}{2}$

For a reaction $A+B\to C+D$, if the concentration of A is doubled without altering that of B, rate doubles. Hence, the order of reaction w.r.t A is 1.

If the concentration of B is increased nine times without altering that of A, rate triples. Hence, the order of reaction w.r.t B is $\frac{1}{2}$.

Order of the reaction is $1+\frac{1}{2}=1\frac{1}{2}$.