Question

In the rate law,

Rate $=k\times \left[A\right]$

What does the $A$ stand for?

• A. The products
• B. Concentration
• C. The products in the rate-determining step
• D. The reactants in the rate-determining step
• E. Any of the reactants

Answer 1

Answer: (E)

Any of the reactants

The rate law for a chemical reaction is an equation that links the reaction rate with the concentrations or pressures of the reactants and constant parameters. For many reactions, the rate is given by a power law such as

$r=k{\left[A\right]}^x{\left[B\right]}^y$

where, $\left[A\right]$ and $\left[B\right]$ express the concentration of the species $A$ and $B$, respectively. The exponents $x$ and $y$ are the partial reaction orders and must be determined experimentally. The constant $k$ is the reaction rate constant of the reaction.

so $\left[A\right]$ given in question will be any of the reactants.

Option-E.