Assertion(A): The molecularity of the reaction
$H_{2} + {Br}_{2} ⟶ 2 HBr$ appears to be 2
Reason (R): Two molecules of the reactants are involved in the given elementary reaction.

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Both A and R are true, and R is the correct explanation of A

Both A and R are true, but R is not the correct explanation of A

A is false but R is true

A is true but R is false

answer is A.

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Detailed Solution

The number of reacting species (atoms, ions or molecules) taking part in an elementary reaction, which must collide simultaneously in order to bring about a chemical reaction is called molecularity of a reaction.
In the given reaction, two moles of reactants i.e., H₂ and Br₂ are in the elementary step of the reaction.

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