Question

Which solution would have a $pH$ greater than $7.0$?

• A. $1.0M$ $HCl$
• B. $0.5M$ ${NH}_{4}Cl$
• C. $0.1M$ $KCN$
• D. $1.0M$ $H_2{SO}_4$
• E. $0.25M$ $HCN$

Answer 1

The correct option is C $0.1M$ $KCN$

As we know that only basic compounds or solution shows pH value greater than $7$ means the given solution should be basic in nature.

(a) $HCl+H_{2}O\to \underset{\text{Acidic solution}}{\underset{}{H_3{O}^{+}+C{l}^{-}}}$

(b) $N{H}_{4}Cl+H_{2}O\to \underset{\text{Acidic}}{\underset{}{N{H}_{4}OH+HCl}}$

(c) $KCN+H_{2}O\to \underset{\text{Beasic}}{\underset{}{KOH+HCN}}$

(d) $H_{2}S{O}_4+H_{2}O\to \underset{\text{Acidic}}{\underset{}{H_3{O}^{+}+HS{O}_4^{-}}}$

(e) $HCN+H_{2}O\to \underset{\text{Acidic}}{\underset{}{H_3{O}^{+}+C{N}^{-}}}$