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Which of the following is hydrolysed to ...

Which of the following is hydrolysed to give white precipitate of oxychloride?

A

`NCl_(3)`

B

`PCl_(3)`

C

`BiCl_(3)`

D

`AsCl_(3)`

Text Solution

Verified by Experts

The correct Answer is:
3

Tricholrides readily undergo hydrolysis but the products of hydrolysis depends on the nature of the elements:
`NCl_(3)+3H_(2)OrarrNH_(3)+3HOCl`
`PCl_(3)+3H_(2)OrarrH_(3)PO_(3)+3HCl`
`AsCl_(3)+3H_(2)OrarrH_(3)AsO_(3)+3HCl`
In contrast the trichlorides of `Sb` and`Bi` are only partly and reversibly hydrolysed to give `HCl` and oxychlorides of the corresponding metal.
`SbCl_(3)+H_(2)O hArr underset("oxychloride")underset("Antimony")(SbO^(+) Cl^(-))+2HCl`
`BiCl_(3)+H_(2)O hArr underset(("white ppt"))underset("oxychloride")underset("Bismuth")(BiO^(+)Cl^(-))+2HCl`
In accordance with`Le` Chatelier principle the addition of excess of `HCl`suuppresses the hydrolysis by shifting the equilibrium to the left.
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