Which allotropic form of phosphorus shows chemiluminescence?

Question

Accepted Answer

White phosphorus is the correct answer because it is the allotropic form of phosphorus that exhibits chemiluminescence. Chemiluminescence is the emission of light as a result of a chemical reaction. White phosphorus is known for its ability to glow in the dark when exposed to oxygen, due to a slow oxidation process that emits light. This property is a characteristic feature of white phosphorus, making it unique among the allotropes of phosphorus.

Now, let's explain why the other options are incorrect:

2. Red phosphorus: Red phosphorus does not exhibit chemiluminescence. It is more stable and less reactive than white phosphorus. Red phosphorus is used in safety matches and fireworks, but it does not have the property of glowing in the dark.

3. a- Black phosphorus: Black phosphorus is another allotrope of phosphorus, known for its layered structure similar to graphite. It is stable and does not exhibit chemiluminescence. Black phosphorus is used in electronics and optoelectronics due to its semiconducting properties, but it does not emit light through chemical reactions.

4. ß- Black phosphorus: Similar to a- Black phosphorus, ß- Black phosphorus is a stable form of phosphorus that does not show chemiluminescence. It shares similar properties with a- Black phosphorus and is not known for emitting light.

In conclusion, white phosphorus is the only allotrope among the options provided that shows chemiluminescence, which is why Option 1 is the correct answer.