Question

The rate constant of a first order reaction is $3 \times 10^{-6}$ per sec. If the initial concentration is $0.10$ $M$, the initial rate of reaction is

• A. $3 \times 10^{-6} Ms ^{-1}$
• B. $3 \times 10^{-5} Ms ^{-1}$
• C. $3 \times 10^{-8} Ms ^{-1}$
• D. $3 \times 10^{-7} Ms ^{-1}$

Answer 1

Answer: (D)

For first order reaction,

rate $=$ rate constant $\times$ concentration of reactant

$\therefore $ Initial rate $=$ rate constant $\times$ Initial concentration

$=3 \times 10^{-6} \times 0.10=3 \times 10^{-7} \,M \,s^{-1}$