$P_{4} O_{10}$ on reacting with water does not form :

Tetra metaphosphoric acid.

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Phosphorous acid.

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Orthophosphoric acid.

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Pyrophsophoric acid.

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Solution

The correct option is D Pyrophsophoric acid.
$P_{4} O_{10} + 2 H_{2} O (C o l d) \to 4 H P O_{3}$
Metaphosphoric acid.

$P_{4} O_{10}$ react With hot water it gives phosphoric acid.

$P_{4} O_{10} + 6 H_{2} O (H o t) \to 4 H_{3} P O_{4}$
Phosphoric acid

Hence,option D is correct.

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