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When orthophosphoric acid is heated to `600^(@)C` the product formed is

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When orthophosphoric acid is heated to `600^(@)C` the product formed is
A. `PH_(3)`
B. `P_(2)O_(5)`
C. `H_(3)PO_(3)`
D. `HPO_(3)`
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Correct Answer - D
When orthophosphoric acid `(H_(3)PO_(4))` is heated and dehydraction takes place. It form metaphosphoric acid `(HPO_(3))`.
`H_(3)PO_(4)overset(Delta)underset(600^(@)C)rarr HPO+H_(2)O`
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