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  4. Solid A reacts with strong NaOH(aq) liberating a foul smelling gas B which spontaneously bum in air giving smoky rings A and B are respectively

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Q. Solid $A$ reacts with strong $NaOH_{(aq)}$ liberating a foul smelling gas $B$ which spontaneously bum in air giving smoky rings $A$ and $B$ are respectively

COMEDKCOMEDK 2014The p-Block Elements - Part2

Solution:

$\underset{\text{ White phosphorus (A) }}{P_{4(s)} }+ 3NaOH_{(aq)} + 3H_2O_{(l)}\rightarrow \underset{\text{ Phosphine (B) }}{PH_{3(g)} + 3NaH_2PO_{2(aq)}} $
Phosphine has unpleasant 'odour like that of garlic or rotten fish. It bums in air to give clouds of $P_4O_{10}$ which act as smoke screens.