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What are the uses of (A) PCl(3) and (B)...

What are the uses of (A) `PCl_(3)` and (B) `PCl_(5)` ?

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(i) It is used in organic preparations and organic analysis.
(ii) On hydrolysis, `PCl_(3)` forms dibasic acid `H_(3)PO_(3)`.
(iii) In alkaline solution, `H_(3)PO_(3)` and its salts act as reducing agents and hence used in the precipitation of Cu, Ag and Au from their salts.
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