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  4. The reaction of white phosphorus on boiling with alkali in inert atmosphere resulted in the formation of product 'A'. The reaction 1 mol of ' A' with excess of AgNO 3 in aqueous medium gives mol ( s ) of Ag. (Round off to the Nearest Integer).

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Q. The reaction of white phosphorus on boiling with alkali in inert atmosphere resulted in the formation of product '$A$'. The reaction $1\,mol$ of ' $A$' with excess of $AgNO _{3}$ in aqueous medium gives $mol ( s )$ of $Ag$. (Round off to the Nearest Integer).

JEE MainJEE Main 2021The p-Block Elements - Part2

Solution:

$P _{4}+3 OH ^{-}+3 H _{2} O \rightarrow PH _{3}+\underset{( A )}{3 H _{2} PO _{2}^{-}}$

$\underset{1\,\text{mole}}{H _{2} PO _{2}^{-}}+\underset{\text { excess}}{4 Ag ^{+}}+2 H _{2} O \rightarrow \underset{4 \text { excess}}{4Ag}+ H _{3} PO _{4}+3 H ^{+}$