Q14 / 196 · NTA Abhyas (NEET) 2020 · Chemistry · Chemical Kinetics

Under what conditions a bimolecular reaction may be kinetically of first order?

A
When both reactants have same concentration
Correct answer
B
When one of the reacting species is in large excess
C
When the reaction is at equilibrium
D
When the activation energy of reaction is less

Solution

If one of the reacting species is in excess, a bimolecular reaction becomes first order reaction. It is generally called as pseudo unimolecular reaction e.g.,

R C O O R' + H_{2} O \to R C O O H + R' O H

Here rate

= K [R C O O R']^{1}

Here water is in excess so it is neglected.

Hence, the correct answer is option: 'B'.

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