1.

`PCl_(3)` fumes in moist air on account ofA. disproportionationB. hydrolysisC. oxidationD. reduction

Answer» Correct Answer - 2
Phosphorus trichloride is readily hydroysed by water to phosphonic acid `H_(3)PO_(3)` (commenly called phosphorous acid), and hydrogen chloride gas which comes out in the forms of fumes:
`PCl_(3)(l)+3H_(2)O(l)rarrH_(3)PO_(3)(aq)+3HCl(g)`


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