What is the molecularity of the following elementary reaction?NH2Cl(aq) + OH-(aq) ----> NHCl-(aq) + H2O(l)

A) unimolecular

B) bimolecular

C) termolecular

D) tetramolecular

E) The reaction order must be known before molecularity can be determined.

Answer : The correct option is, (B) bimolecular

Explanation :

Molecularity : It is defined as the total number of reactant molecules taking part in the balanced equation of a reaction. It is a theoretical concept.

The given balanced chemical reaction is,

NH_2Cl(aq)+OH^-(aq)\rightarrow NHCl^-(aq)+H_2O(l)

The number of reactants molecules taking part in the balanced equation of a reaction are, NH_2Cl and OH^-.

In this reaction, 1 NH_2Cl molecules reacts with the 1 OH^- molecule.

Total number of reactant molecule = 1 + 1 = 2

The molecularity of the reaction is 2 that means, the elementary reaction is bimolecular.

Hence, the correct option is, (B) bimolecular

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