On reaction with `Cl_2`, phosphorus forms two types of halides 'A' and 'B' Halide A is yellowish-white powder but halide 'B' is colourless oily liquid. Identify A and B and write the formulas of their hydrolysis products.

Explanation

`A: PCl_(5)`
`B: PCl_(3)`
`PCl_(3)` Hydrolyse to give `H_(3)PO_(3)` and `PCl_(5)` hydrolysis to give `H_(3)PO_(4)`
`P_(4) + 10Cl_(2) to 4PCl_(5)`
`PCl_(5) + 4H_(2)O to H_(3)PO_(4) + 5HCl`
`P_(4) + 6Cl_(2) to 4PCl_(3)`
`PCl_(3) + 3H_(2)O to H_(3)PO_(3) + 3HCl`