Question

Mercuric chloride reacts with aqueous ammonia to form a white precipitate of
A. `Hg (NH_(3))_(2)CI_(2)`
B. `Hg (NH_(2))_(2)CI_(2)`
C. `Hg (NH_(3))_(2)CI`
D. `HG (NH_(2))CI`

Answer 1

Correct Answer - D
When aqueous ammonia is added to the solution of mercuric chloride, a white precipitate) is formed:
`HgCI_(2) + 2NH_(3) (aq) rarr Hg(NH_(2))CI + NH_(4)CI`
The infusible white precipitate decomposes without melting on heating. On the other hand, gaseous ammonia or ammonium chloride produces a fusible white precipitate of diammine mercury (II) chloride.
`HgCI_(2) + 2NH_(3) rarr Hg(NH_(3))_(2) CI_(2)`