Question

Mercury sulphate on treating with NaOH gives ..................... colored precipitate of $H{g}^{2+}$.

• A. orange/yellow
• B. black
• C. dense white
• D. lilac

Answer 1

The correct option is A orange/yellow

A solution of a mercury salt (Mercury(II) sulphate) was mixed with an equal amount of another solution, in which a physical change is noted, usually a colour change due to a precipitation of the mercury insoluble compound or formation of a complex since mercury is a transitional metal. It forms a light yellow ppt with the sodium hydroxide and do not dissolve in excess.