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Question

White phosphorus can be separated from red phosphorus by:



A

Sublimation

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B

Distillation

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C

Dissolving in CS2

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D

Heating with alkali solution

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Solution

The correct options are
C

Dissolving in CS2


D

Heating with alkali solution


Red phosphorus doesn't easily react with NaOH. This is in contrast with white phosphorus:

P4+3NaOH+3H2OPH3+3NaH2PO2

Don't forget that the general rule for sulibility is "like dissolves like."

White phosphorus is a molecular solid made of non-polar P4 units. Hence, it is soluble in non-polar solvents like CS2, while red phosphorus is not!


Chemistry

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