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 formulae of their hydrolysis products.

Explanation

Since `Cl_(2)` reacts with phosphorus to form two halides (A and B), therefore, these halides must be `PCl_(5) and PCl_(3)`. Since halide 'A' is a yellowish-white solid but halide 'B' is a colourless oily liquid, therefore, due to higher molecular mass and hence stronger forces of attraction, halide 'A' must be a solid, i.e., `PCl_(5)` and
`{:(P_(4)+10Cl_(2) rarr 4 underset((A))(PCl_(5))("yellowish-white solid")),(P_(4)+6Cl_(2) rarr underset((B))(4 PCl_(3))("Colourless oily liquid")):}`
halide 'B' must be a liquid, i.e., `PCl_(3)`.
Their hydrolysis products are shown below :
`{:(underset("Phosphorus pentachloride")(PCl_(5))+4H_(2)O rarr underset("Orthophosphoric acid")(H_(3)PO_(4))+5HCl),(underset("Phosphorus trichloride")(PCl_(3))" "+3H_(2)O rarr underset("Phosphorus acid")(H_(3)PO_(3))" "+3HCl):}`