Phosphorus pentoxide is widely used as:

Bleaching agent

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Dehydrating agent

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Oxidising agent

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Reducing agent

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Solution

The correct option is B Dehydrating agent
Phosphorus pentoxide acts as a powerful dehydrating agent. It dehydrates $H {N O}_{3}$ to $N_{2} O_{5}, H_{2} {S O}_{4}$ to ${S O}_{3}, H C l O_{4}$ to ${C l}_{2} O_{7}$ etc.

$4 H {N O}_{3} + P_{4} O_{10} ⟶ 2 N_{2} O_{5}$

$2 H_{2} {S O}_{4} + P_{4} O_{10} ⟶ 2 {S O}_{3} + 4 H {P O}_{3}$

$4 H C l O_{4} + P_{4} O_{10} ⟶ 2 {C l}_{2} O_{7} + 4 H {P O}_{3}$

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