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Phosphorus pentoxide has great affinity for water. It forms ortho phosphoric acid on absorbing water.

1. It is thus used as a powerful dehydrating or drying agent.
2. It is used as a catalyst in the reaction.
3. It is used in the preparation of phosphine gas.
4. It is used in the preparation of red phosphorus.

Correct answer: It is thus used as a powerful dehydrating or drying agent.

Solution

Phosphorus pentoxide is a strong dehydrating agent due to its high affinity for water, making option A correct. The other options do not align with its primary use.

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