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5/76 MCQs for:

MATTER - PROPERTIES AND TRANSFORMATION: Chemistry of Elements - Phosphorus

The electronic configuration of phosphorus is:

2:8:5.

2:7.

2:5.

2:4.

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

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

Displaces the volatile phosphorus from calcium phosphate.

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

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

The reaction of white phosphorus with air at room temperature is an example of:

Displacement reaction.

Slow oxidation (chemiluminescence).

Neutralization reaction.

Rapid combustion.

What type of chemical reaction is the formation of phosphorus oxides from phosphorus and oxygen?

Neutralization.

Displacement.

Combination (synthesis).

Decomposition.

Red phosphorus obtained when:

Black phosphorus is heated to a temperature of about 250℃ in the absence of air an in the presence of a small amount of iodine or sulphur as a catalyst.

White phosphorus is heated to a temperature of about 250℃ in the absence of air an in the presence of a small amount of iodine or sulphur as a catalyst.

White phosphorus is heated to a temperature of about 250℃ in the presence of air and a small amount of iodine or Sulphur as a catalyst.

White phosphorus is heated to a temperature of about 50℃ in the absence of air.