Question

Which of the following electrolytes exhibits maximum conductivity?

• A. 1 M NaCl
• B. 1 M KCl
• C. 1 M Ca (NO${}_3$)${}_2$
• D. 1 M Al${}_2$ (SO${}_4$)${}_3$

Answer 1

The correct option is D 1 M Al${}_2$ (SO${}_4$)${}_3$

Greater the number of ions per mole of electrolyte , greater will be the electrical conductivity of its solution.

Thus, aluminium sulphate dissociates to give $2$ moles of $A{l}^{3+}$ and $3$ moles of $S{O}_4^{2-}$ with a total of $5$ moles of ions per mole of the electrolyte.

Thus, $A{l}_2(S{O}_4{)}_3$ exhibits maximum conductivity.

Option D is correct.