Question

Match the batteries given in Column-I with the electrolytes given in Column-II. \[ \begin{array}{llcl} (a) & \text{Lead storage battery} & (r) & 38\% \text{ solution of } H_2SO_4 \\[4pt] (b) & \text{Leclanché cell} & (s) & \text{Moist paste of } NH_4Cl \text{ and } ZnCl_2 \\[4pt] (c) & \text{Mercury cell} & (p) & \text{Moist KOH} \\[4pt] (d) & \text{Nickel-Cadmium cell} & (q) & \text{KOH and ZnO paste} \end{array} \]

• A. \((a)-(r),\ (b)-(s),\ (c)-(q),\ (d)-(p)\)
• B. \((a)-(s),\ (b)-(r),\ (c)-(q),\ (d)-(p)\)
• C. \((a)-(r),\ (b)-(s),\ (c)-(p),\ (d)-(q)\)
• D. \((a)-(q),\ (b)-(p),\ (c)-(s),\ (d)-(r)\)

Hint:

Remember the commonly used electrolytes:

• Lead storage battery \(\rightarrow\) \(\mathrm{H_2SO_4}\)

• Leclanché cell \(\rightarrow\) \(\mathrm{NH_4Cl + ZnCl_2}\)

• Mercury cell \(\rightarrow\) KOH

• Nickel-Cadmium cell \(\rightarrow\) KOH + ZnO

Answer 1

The Correct Option is C

Concept: Different electrochemical cells use different electrolytes depending on the nature of the electrodes and the reactions occurring inside the cell.

• Lead storage battery uses dilute sulphuric acid (\(\mathrm{H_2SO_4}\)).

• Leclanché cell contains a moist paste of \(\mathrm{NH_4Cl}\) and \(\mathrm{ZnCl_2}\).

• Mercury cell uses alkaline electrolyte such as KOH paste.

• Nickel-Cadmium cell uses KOH along with ZnO.

Step 1: Match Lead storage battery with its electrolyte. Lead storage battery contains dilute sulphuric acid as electrolyte. \[ (a) \rightarrow (r) \]

Step 2: Match Leclanché cell with its electrolyte. Leclanché cell contains a moist paste of ammonium chloride and zinc chloride. \[ (b) \rightarrow (s) \]

Step 3: Match Mercury cell with its electrolyte. Mercury cell uses moist KOH paste as electrolyte. \[ (c) \rightarrow (p) \]

Step 4: Match Nickel-Cadmium cell with its electrolyte. Nickel-Cadmium cell contains KOH and ZnO paste. \[ (d) \rightarrow (q) \] Thus, the correct matching is \[ (a-r), \; (b-s), \; (c-p), \; (d-q) \] \[ \boxed{(a-r), \; (b-s), \; (c-p), \; (d-q)} \] Hence, option \(\mathbf{(C)}\) is correct.