Answer
See answer below.
Work Step by Step
a) $(NH_4)_2S(aq)+Hg(NO_3)_2(aq)\rightarrow HgS(s)+2\ NH_4NO_3(aq)$
b) From left to right:
Ammonium sulfide, mercury (||) nitrate, mercury (||) sulfide, ammonium nitrate
c) Precipitation reaction.
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