NH4NO2 =N2+2H2O

rn

how can we know dat molecularity of this is 1

Molecularity is defined as the number of reactant molecules that are colliding with each other to form the product in an elementary reaction. Now, the given reaction:

NH₄NO₂ → N₂ + 2H₂O

It represents the decomposition of ammonium nitrate into nitrogen and water, thus only molecule of ammonium nitrate is decomposing to form the product, so the molecularity of the reaction is 1.