Salt`(A)` on heating gives a colourless neutral gas which supports combustion.
From the aforesaid, flow diagram, answer the following questions.
The basic radical of salt `(A)` and gas `B` both gives brown precipitate with Nessler's reagent.The composition of the brown precipitate is:

Options

A. `(NH_(4))_(2)[HgI_(4)]`
B. `Hg(NH_(2))NO_(3)`
C. `HgO.HG(NH_(2))I`
D. `(NH_(4))_(3)[Co(NO_(2))_(6)]`

Answer

C

Explanation

`NH_(4)^(+)+2[HgI_(4)]^(2-)+4OH^(-)toHgO.Hg(NH_(2))Idarr+7I^(-)+3H_(2)O`
Hence the cation is `NH_(4)^(+)`