Chemical Kinetics Question 163

Question: The rate constant of a reaction is $ 0.69\times {10^{-1}}{{\min }^{-1}} $ and the initial concentration is $ 0.2mol,{l^{-1}}. $ The half-life period is [AIIMS 1998]

Options:

A) 400 sec

B) 600 sec

C) 800 sec

D) 1200 sec

Show Answer

Answer:

Correct Answer: B

Solution:

The unit of rate constant shows that reaction is of first order. For first order reaction, half life is independent of initial conc. of the reactant.

Thus, $ {t_{1/2}}=\frac{0.693}{0.69\times {10^{-1}}}=\frac{0.693\times 60}{0.69\times {10^{-1}}}=600,\sec $



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