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Ortho phosphoric acid on heating above `300^(@)C` gives :

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Ortho phosphoric acid on heating above `300^(@)C` gives :
A. hypophosphorus acid
B. hypophosphoric acid
C. metaphosphoric acid
D. phosphorous acid
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Correct Answer - C
`H_(3)PO_(4) overset(220^(@)C)rarr H_(4)P_(2)O_(7) overset(320^(@)C) rarr (HPO_(3))_(n)`
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