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  4. Dissolving 1.24 g of white phosphorous in boiling NaOH solution in an inert atmosphere gives a gas Q. The amount of CuSO 4 (in g) required to completely consume the gas Q is [Given: Atomic mass of H =1, O =16, Na =23, P =31, S =32, Cu =63 ]

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Q. Dissolving $1.24 \,g$ of white phosphorous in boiling $NaOH$ solution in an inert atmosphere gives a gas $Q$. The amount of $CuSO _4$ (in g) required to completely consume the gas $Q$ is ___
[Given : Atomic mass of $H =1, O =16, Na =23, P =31, S =32, Cu =63$ ]

JEE AdvancedJEE Advanced 2022

Solution:

Mole of $P _4=\frac{1.24}{31 \times 4}=0.01$
$\underset{0.01 \text { mole }}{P _4+3 NaOH} +3 H _2 O \longrightarrow \underset{0.01 \text { mole } }{PH _3}+3 NaH _2 PO _2 $
$\underset{0.01}{2 PH _3}+\underset{\frac{3}{2} \times 0.01}{3 CuSO _4} \rightarrow Cu _3 P _2+3 H _2 SO _4$
$=\frac{0.03}{2} \text { moles } $
$ W _{ CuSO _4}=\frac{0.03}{2} \times 159=2.385\, gm $