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 ?

Options

A. `NH_(4)Cl`
B. `NH_(4)NO_(3)`
C. `NH_(4)NO_(2)`
D. `FeSO_(4)`

Answer

A

Explanation

`NH_(4)Cl overset(Delta)to underset(Y)(NH_(3))+underset(Z)(HCl)`
`underset(Y)(NH_(3))+underset("Nessler's reagent")(2K_(2)[HgI_(4)])+3KOH to underset("brown ppt. iodide of Millon's base")(H_(2)NHgO*HgI+7KI+H_(2)O`