Question

Green vitriol is the common name of .

• A. $FeS{O}_4$
• B. $CuS{O}_4$
• C. $ZnS{O}_4$

Answer 1

The correct option is A $FeS{O}_4$

The colour of hydrated $F{e}^{2+}$ ion is green. Thus, when $FeS{O}_4$ is added to water, the $Fe$ ions get hydrated and the solution turns green. This is why, $FeS{O}_4$ is commonly known as green vitriol.

Similarly, $C{u}^{2+}\left(aq\right)$ is blue in colour, and thus $CuS{O}_4$ is known as blue vitriol.

$ZnS{O}_4$ solution is colourless as $Z{n}^{2_{+}}$ is colourless.