A reaction is of first order in reactant A and of second order in reactant B. How is the rate of this reaction affected when (i) the concentration of B alone is increased to three times (ii) the concentrations of A as well as B are doubled?

Explanation

To solve the problem, we need to analyze how the rate of a chemical reaction changes based on the orders of the reactants and the changes in their concentrations.

### Given Information:
- The reaction is first order in reactant A and second order in reactant B.
- The rate of the reaction can be expressed as:
\[ R = k [A]^1 [B]^2 \]
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