Calculate the n factor of NH4Cl for the following change: NH4Cl+NaNO2→N2+2H2O+NaCl
A
6
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B
3
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C
2
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D
4
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Solution
The correct option is B 3 Steps for finding valency factor/n-factor: 1. Find the oxidation state (O.S.) of metal in reactant side. 2. Find the oxidation state of metal in product side. 3. Take the magnitude of difference of two oxidation state |O.S.Product−O.S.Reactant| for the valency factor
(NH4Cl+NaNO2→N2+H2O+NaCl O.S. of N in reactant side ⇒x+1×(−1)+4×(+1)=0 ⇒x=−3
O.S. of N in product side ⇒x=0 as nitrogen is present in natural state.