A colourless inorganic salt `(A)` decomposes completely at about `250^@ C` to give only two products `(B)` and `( C)`, leaving no residue. The oxide `( C)` is a liquid at room temperature and neutral to litmus paper while the gas `(B)` is a neutral oxide. White phosphorous burns in excess of `(B)` to produce a strong white dehydrating agent. Write balanced equations for the reactions involved in this process.

Explanation

A colourless inorganic salt A decomposes completely at about `250^(@)C` to give only two products B and C having to residue .The oxide C is a liquid at room temperature and neatral to moist litmous paper is water .Gas B is a neatral oxide , it must be nitrous oxide so, A must be ammonium nitrate .white phosphorus burns in excess of nirrous oxide to produce a strong white debydrating agent phosphorous penoxide
`underset((A))(NH_(4)NO_(3)) overset(250^(@)C) rarr underset((B))(N_(2)Ouarr) + underset((C))(2H_(2)uarr)`
No residue left.
`P_(4) + 10 N_(2)O rarr P_(4)O_(10) +10N_(2)`