Answer :

when chlorine first react with phosphorous and heated in a retort, it will form phosphorous trichloride PCl3. PCl3 further react with chlorine to form PCl5.

Halide A is PCl5 because it is yellowish white powder

Halide B is PCl3 because it is colourless oily liquid.

PCl3 + 3H2O H3PO3 + 3HCl

PCl5 undergoes a violent hydrolysis

PCl5 + H2O POCl3 + 2HCl

PCl5 + 4H2O H3PO4 + 5HCl

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