MCQ
The dimension of rate constant of a second order reaction involves
- ANeither time nor concentration
- BOnly time
- ✓Time and concentration
- DTime and square of concentration
✓
Answer
Correct option: C.
Time and concentration
c
Let us consider a second order reaction: $A \rightarrow B$
Let us consider a second order reaction: $A \rightarrow B$
Rate Law for this Reaction is given by : Rate $= k [ A ]^2$
$\because$ Unit of Rate of Reaction is $mol \,litre { }^{-1} \,\sec ^{-1}$ and Unit of Concentration is $mol\, litre ^{-1}$
$\therefore$ Unit of Rate constant is $mol ^{-1}\, litre\,sec ^{-1}$
$\Rightarrow$ Unit of Rate constant is $\left( mol \text { litre }^{-1}\right)^{-1}\, sec ^{-1}$
Unit of Rate constant is $(concentration) { }^{-1} \,\sec ^{-1}$
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