Question

The two aqueous solutions; $A$ $\left(AgN{O}_3\right)$ and $B\left(LiCl\right)$ were electrolysed using $Pt$ electrodes. The pH of the resulting solutions will :

• A. increase in A and decrease in B
• B. decrease in both
• C. increase in both
• D. decrease in A and increase in B

Answer 1

The correct option is D decrease in A and increase in B

$AgN{O}_3+H_{2}O\to H^{+}+Ag+N{O}_3^{-}+1/2O_2$

As hydrogen ion conc. increases so the pH of the solution will decrease.

$LiCl+H_{2}O\to L{i}^{+}+O{H}^{-}+1/2C{l}_2+1/2H_2$

As hydroxide ion conc. increases so the pH of the solution will increase.

Option D is correct.