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In the extraction of phosphorus, the non-volatile silicon dioxide in the sand

Displaces the volatile phosphorus from calcium phosphate.

Displaces the volatile phosphorus (V) oxide from magnsium phosphate.

Displaces the volatile phosphorus (V) oxide from phosphoric acid.

Displaces the volatile phosphorus (V) oxide from calcium phosphate.

What is a major use of red phosphorus?

In the production of glowing toys.

In the manufacture of matches (on the striking surface).

As a component in fireworks.

As a highly reactive oxidizing agent.

Phosphorus is never found free in nature because:

It catches fire easily.

It is too expensive.

It is too reactive.

It is less reactive.

Physical properties of white phosphorus:

All are correct.

It is denser than water.

It is a white, waxy and translucent solid which turns yellow on exposure to light due to partial conversion to red phosphorus.

It is insoluble in water but soluble in carbon disulphide and benzene.

Which allotrope of phosphorus is used in the manufacture of some semiconductors due to its layered structure?

Violet phosphorus.

White phosphorus.

Black phosphorus.

Red phosphorus.