Question

In presence of moisture $H_{2}S$ can:

• A. act as oxidant
• B. lose electron
• C. gain electron
• D. none of these

Answer 1

The correct option is B lose electron

$H_{2}S+H_{2}O\leftrightharpoons S^{2-}+H_3{O}^{+}$
Here, $H_{2}S$ loses electrons.
The solution is initially clear, but clouds up due to slow reaction of hydrogen sulphide with oxygen in water. So, elemental sulphur is precipitated in the solution.