Red phosphorus can be prepared from white phosphorus by : | CHEMISTRY - PHOSPHORUS - ALLOTROPIC FORMS | SolveeIt | Solveeit

Today, August 18

Question

Red phosphorus can be prepared from white phosphorus by :

A

Adding red colour to white phosphorus

B

Heating white phosphorus to red heat

C

Heating white phosphorus at 250⁰C or at low temperature in the presence of sun light.

D

Dissolving white phosphorus in NaOH

Answer

Heating white phosphorus at 250⁰C or at low temperature in the presence of sun light.

Explanation

Solution

Red phosphorus is inert towards sodium hydroxide but white phosphorus reacts according to following reaction.

P4 + 3NaOH + 3H2O v $\longrightarrow$ PH3 + 3NaH2PO2