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 $\mathrm{FeCl_3}$ salt undergoes hydrolysis and forms HCl.

$\mathrm{FeCl_3} \rightarrow \mathrm{Fe}^{3+} + 3 \mathrm{Cl}^{-}$

$\mathrm{H}^{+} + \mathrm{Cl}^{-}$ → 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.