The aqueous solution of sugar does not conduct electricity. However when sodium chloride is added to water, it conducts electricity. How will you explain this statement on the basis of ionisation and how is it affected by concentration of sodium chloride ?

Explanation

(i) Sugar is non-electrolyte and does not ionise in water but NaCl ionize completely in water and produces `Na^+` and `Cl^-` ions, which help in conduction of electricity.
(ii) Conductance increases with increase in concentration of NaCl due to release of more `Na^+` and `Cl^-` ions.