RRB Group-D Model Paper 20 with answers for online practice

Explanation:

• The solution of ferric chloride is acidic in nature.
• The aqueous solution of $\mathit{F}\mathit{e}\mathit{C}{\mathit{l}}_3$ salt undergoes hydrolysis and forms HCl.

$\mathit{F}\mathit{e}\mathit{C}{\mathit{l}}_3\to \mathit{F}{\mathit{e}}^{3+}+3\mathit{C}{\mathit{l}}^{-}$

${\mathit{H}}^{+}+\mathit{C}{\mathit{l}}^{-}$ → HCl

• This strong acid releases H+ ions in the solution.
• The resulting solution is acidic and turns blue litmus turns red.

So, the pH of the solution is acidic and on pH scale, it will be less than 7.