A colourless water soluble solid (X) on heating gives equimolar quantities of (Y) and (Z). Y gives dense white fumes with HCl and Z does so with `NH_(3)`. Y gives brown ppt. with `K_(2)Hgl_(4)` (Nesslers reagent) and Z gives white precipitate with nitrates of `Ag^(+), Pb^(2+) and Hg^(+)`. What is X ?

Explanation

Y is `NH_(3)` and Z is HCl
Hence X must be `NH_(4)Cl`
`underset((X))(NH_(4)Cl)overset("Heat")rarr underset((Y))(NH_(3))+underset((Z))(HCl)`