Question

White phosphorus can be separated from red phosphorus by________.

A
sublimation
B
dissolving in CS2
C
distillation
D
heating with alkali solution
Solution
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White phosphorus is soluble in organic solvents such as CS2, CCl4.
Red phosphorus is insoluble in such solvents. Hence, white phosphorus can be separated from red phosphorus by dissolving in CS2 or anCCl4.
White phosphorus reacts with caustic alkalies (NaOH and KOH).
Red phosphorus does not react with caustic alkalies (NaOH and KOH).
Hence, white phosphorus can be separated from red phosphorus by heating with an alkali solution.
White phosphorous is boiled with aqueous NaOH solution to obtain phosphine.
P4+3NaOH+3H2O3NaH2PO2+PH3

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