p-Block elementsHard

Question

White phosphorus may be removed from red phosphorus by :

Options

A.sublimation
B.distillation
C.heating
D.heating with an alkali solution

Solution

Red phosphorus is inert towards sodium hydroxide but white phosphorus reacts according to following reaction.   P4 + 3NaOH + 3H2O → PH3 + 3NaH2PO2

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