Question

Which of the following when dissolved in water forms a solution, ie, non-conducting?

• A. Chile salt petre
• B. Potash alum
• C. Green vitriol
• D. Ethyl alcohol

Answer 1

Answer: (D)

(a) Chile salt petre, $NaN{O}_3$ being a electrovalent (ionic) compound gives ions in the aqueous solution, therefore it is a conductor of electricity.

(b) Potash alum, $K_{2}S{O}_4\cdot A{l}_2{\left(S{O}_4\right)}_3\cdot 24H_{2}O$

when dissolve in water, dissociates into its constituent particles. Due to which it is conducting in nature.

(c) Green vitriol, $FeS{O}_4\cdot 7H_{2}O$, also gives ions in the aqueous solution, so it is conducting in nature.

(d) Ethyl alcohol, $C_2{H}_{5}OH$ being covalent in nature, does not produce any ion in aqueous solution. Hence, it is non-conducting in nature.