Question

In a permutit, the calcium and magnesium ions of hard water are exchanged by:

• A. $C{O}_3^{2-}$and $HC{O}_3{}^{-}$ ions of permutit
• B. $N{a}^{+}$ ions of permutit
• C. $A{l}^{3+}$ ions of permutit
• D. $S{i}^{4+}$ ions of permutiti

Answer 1

The correct option is B $N{a}^{+}$ ions of permutit

Permutit is an artificial zeolite. It is sodium aluminium orthosilicate $N{a}_{2}A{l}_{2}S{i}_2{O}_8.x{H}_{2}O$.

$\underset{\text{permutit}}{N{a}_{2}A{l}_{2}S{i}_2{O}_8.x{H}_{2}O}+C{a}^{2+}\left(orM{g}^{2+}\right)\to \underset{\text{exhausted permutit}}{CaA{l}_{2}S{i}_2{O}_8.x{H}_{2}O}+2N{a}^{+}$