Observe the following experiment.

The correct statement about set up (I) and {II) are :

In set up (I), the precipitate is formed with excess ${\mathrm{AgNO}}_3$ which is soluble in ammonia solution.

In set up (II), initially white precipitate is formed as well as on boiling gives greyish black ppt.

In set up (I), initially no precipitate is formed but on addition of excess of reagent and followed by boiling gives greyish black ppt.

In set up (II), the precipitate is soluble is dilute nitric acid, and gives gas with suffocating smell of burning Sulphur which turns lime water milky ..