Question

Which one of the following is correct with respect to molar ionic conductance of ions in aqueous solution?

• A. $L{i}^{+}<N{a}^{+}<K^{+}<R{b}^{+}$
• B. $R{b}^{+}<K^{+}<N{a}^{+}<L{i}^{+}$
• C. $S{r}^{2+}<C{a}^{2+}<M{g}^{2+}<B{e}^{2+}$
• D. $N{a}^{+}<K^{+}<L{i}^{+}<R{b}^{+}$

Answer 1

The correct option is A $L{i}^{+}<N{a}^{+}<K^{+}<R{b}^{+}$

Larger is the size of the ion, smaller is the degree of hydration and larger is the molar ionic conductance. Hence, the correct order of the molar ionic conductance is $L{i}^{+}<N{a}^{+}<K^{+}<R{b}^{+}$.