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.

On reaction with Cl_(2), phosphorus forms two types of halides 'A' and

1.	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.
Answer» Solution :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):}`