1(xiii)
Three different solutions X (sodium chloride solution), Y (acetic acid) and Z (sugar solution) were used for electrolysis by a student. When the circuit was completed, he noticed that the bulb glowed in the electrolytic cell containing:
- (a)X & Y
- (b)Y & Z
- (c)Z & X
- (d)X, Y & Z
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X & Y
Reason — X (NaCl solution) is an electrolyte, it contains free Na+ and Cl- ions, so it conducts electricity well.
Y (acetic acid) is a weak electrolyte, it partially ionises to give H+ and CH3COO- , so it can conduct where the bulb may glow dimmer than with a strong electrolyte. Whereas, Z (sugar solution) contains molecular sucrose which does not dissociate into ions.