In which of the following preparation, orthophosphoric acid is used?

Metaphosphoric acid

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Phosphorus acid

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Sulphurous acid

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Pyrophosphoric acid

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Solution

The correct option is B Pyrophosphoric acid
When one molecule of water has been removed for each two molecules of phosphoric acid and orthophosphoric acid ( $H_{4} P_{2} O_{7}$ ).

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