For a reaction:
(i) Write the order and molecularity of this reaction.
(ii) Write the unit of $k$ .

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Solution

$2 N H_{3} P t ⟶ N_{2} + 3 H_{2}$
Rate $= k$
(i)The reaction is $Z e r o$ order reaction as the rate is independent of the concentration of the reactant.
Molecularity is the number of molecules that come together to react in an elementary reaction. So the reaction is Bimolecular as two molecules of $N H_{3}$ are reacting.
(ii)The unit of rate constant for zero order reaction $k = M o l a r i t y / s e c$ or $m o l e / L p e r s e c o n d$

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