Question

Predict which of the formulae are not correct for the given compounds: Correct the wrong ones.
Silver sulphide : $\mathrm{AgS}$

Answer 1

Silver sulphide:

1. Silver sulphide is the sole sulphide of silver and it is a thick black solid.
2. In photography, it can be used as a photosensitizer.

Chemical formula:

1. The chemical formula that is given as $\mathrm{AgS}$ for Silver sulphide is wrong.
2. There is no compound with a chemical formula $\mathrm{AgS}$.
3. Silver sulphide has a chemical formula ${\mathrm{Ag}}_2\mathrm{S}$. As the valency of sulpahte(-2) moves to silver and valency of silver (1) moves to sulphite.