Can someone explain to me what n factor/valency factor is? With some examples

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n factor or valency factor
n factor or valency factor is a term used in redox reactions. It is used to describe the number of electrons gained or lost per atom during a reaction.
Suppose if we take the displacement reaction between zinc and copper sulphate solution,
$Z n (s) + C u S O_{4} (a q) ⟶ Z n S O_{4} (a q) + C u (s)$
Here $Z n$ loses two electrons to become $Z n^{+ 2}$ . So the n factor for zinc is 2
Similarly, If we take the reaction between potassium chromate and Iron sulphate.
$6 F e S O_{4} + K_{2} C r_{2} O_{7} + 7 H_{2} S O_{4} ⟶ 3 F e_{2} {(S O_{4})}_{3} + K_{2} S O_{4} + C r_{2} {(S O_{4})}_{3} + 7 H_{2} O$
The $F e^{+ 2}$ is oxidized to $F e^{+ 3}$ by losing one electron. So the n factor for $F e S O_{4}$ is 1
The n factor for an organic acid such as an oxalic acid, if we consider the following reaction of dissociation of oxalic acid.
$C O O H - C O O H ⟶ 2 C O_{2} + 2 H^{+} + 2 e^{-}$
In oxalic acid, the number of replaceable hydrogen ions is 2, hence the n factor is 2.

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