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X is a pale yellow solid. It hydrolyses ...

X is a pale yellow solid. It hydrolyses to `POCl_(3)` in moist air and finally gets converted into phosphoric acid. Z exists as an ionic solid. The total number of atoms present in its cation is.

Text Solution

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The correct Answer is:
5
`underset((X))(PCl_(5))+H_(2)OtoPOCl_(3)+2HCl,`
`POCl_(3)+3H_(2)OtoH_(3)PO_(4)+3HCl`
In the solid state, `PCl_(5)` (X) exists as `[PCl_(4)]^(+)[PCl_(6)]^(-)` in which the cation has 5 atmos (4Cl+1P).
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