First slide

Group15 or Nitrogen family

Question

White phosphorus cannot be separated from red phosphorus by:

Moderate

A

sublimation
B

dissolving in ${CS}_{2}$
C

distillation
D

heating and alkali solution

Solution

While $P_{4}$ dissolves in ${CS}_{2}$ and also in $NaOH$ to form ${PH}_{3}$ and $H_{2} {PO}_{2}^{⊖}$ ion. Whereas red $P_{4}$ is not solution in ${CS}_{2}$ and does not react with alkali solution.

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