Which of the following paste is used in dry cell as an electrolyte?

Options

APaste of ammonium chloride ( $\text{NH}_4\text{Cl}$ ) and zinc chloride ( $\text{ZnCl}_2$ )
BPaste of manganese dioxide ( $\text{MnO}_2$ ) and carbon black
CPaste of potassium hydroxide (KOH) and zinc oxide (ZnO)
DPaste of sodium hydroxide ( NaOH ) and zinc chloride ( $\text{ZnCl}_2$ )

Correct answer

A. Paste of ammonium chloride ( $\text{NH}_4\text{Cl}$ ) and zinc chloride ( $\text{ZnCl}_2$ )

Step-by-step solution

A dry cell (Leclanché cell) consists of a zinc container which acts as the anode and a carbon (graphite) rod surrounded by powdered manganese dioxide (

\text{MnO}_2

) and carbon which acts as the cathode.

The space between the electrodes is filled with a moist paste of ammonium chloride (

\text{NH}_4\text{Cl}

) and zinc chloride (

\text{ZnCl}_2

), which acts as the electrolyte.

Answer: Paste of ammonium chloride (

\text{NH}_4\text{Cl}

) and zinc chloride (

\text{ZnCl}_2

)

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