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Boric acid on heating at 100^@ C, gives ...

Boric acid on heating at `100^@ C`, gives `(X)`. `(X)` on heating at `160^@ C` gives `(Y)` and `(Y)` on heating at red hot gives `(Z)`. Identify `(X),(Y)` and `(Z)`.

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The correct Answer is:
2
`PCI_(3) +H_(2)O rarr H_(2)PO_(3)+HCI`
`H_(3)PO_(3) overset(200^(@)C)rarr H_(3)PO_(4)+PH_(3)`
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