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 phosphours to form two halids (A and B), therefore, thses halides must be `PCl_(3)andPCl_(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)to4PCl_(3)` (yellowish-white solid)
`P_(4)+6Cl_(2)tounderset((B))(4PCl_(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)Otounderset("Orthophosphoric acid")(H_(3)PO_(4))+5HCl`
`underset("Phosphorus trichloride")(PCl_(3))+3H_(2)Otounderset("Phosphorus acid")(H_(3)PO_(3))+3HCl`