Question

White phosphorus can be removed from red phosphorus by:

• A. sublimation
• B. dissolving in $C{S}_2$
• C. distillation
• D. heating with alkali solution

Answer 1

Answer: (A), (D)

The correct options are
A sublimation
D heating with alkali solution

Red phosphorous sublimes in absence of air at 560K, while white phosphorus doesn't,
On reaction with alkali, white phosphorous evolves phosphine, while red phosphorous shows no reaction.