1.

H_(3)PO_(2) overset(140^(@)) rarrA overset(220^(@)C) toB overset(320^(@)C)rarrC. Compound ( C) is :

Answer»

`H_(2)PO_(3)`
`H_(3)PO_(3)`
`(HPO_(3))_(N)`
`H_(4)P_(2)O_(7)`

Answer :C


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