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With the diagram explain dry cell (lecla...

With the diagram explain dry cell (leclanche cell).

Text Solution

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Dry cell is a primary battery.

Anode: Zinc container of the cell.
Cathode. Carbon rod surrounded by `MnO_(2)` powder.
The space between the anode is filled by paste of `NH_(4)Cl and ZnCl_(2)` mixture.
Reactions:
`{:(,"Anode",Zn(s) to Zn^(2+)+2e^(-)),(,"Cathode",MnO_(2)+NH_(4)^(+)+e^(-)to MnO(OH)+NH_(3)):}`
`"Overall reaction" (Zn(s)+2MnO_(2)+2NH_(4)^(+)to 2MnO(OH)+2NH_(3)+Zn^(2+)`
Cell potential -1.5V.
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Knowledge Check

  • The cathode reaction in the dry cell will be

    A
    `Zn(s)rarr Zn^(+2)+2e^-`
    B
    `MnO_2`+NH_4^+ +e^- rarr MnO(OH)+NH_3`
    C
    `Zn(Hg)+2OH^- rarr ZnO(s)+H_2O+2e^-`
    D
    `MnO(OH)+NH_3 rarr MnO_2 +NH_4^+ +2e^-`.

  • In the Leclanche dry cell, anode is :

    A
    Graphite rod
    B
    Carbon
    C
    Zinc container
    D
    `MnO_(2)+C`

  • The cathode reaction in the dry cell will be :

    A
    `Zn(s) rarr Zn^(2+)+2e^(-)`
    B
    `MnO_(2)+NH_(4)^(+)-e^(-) rarr MnO(OH)+NH_(3)`
    C
    `Zn(Hg)+2OH^(-) rarr ZnO(s)+H_(2)O+2e^(-)`
    D
    `MnO(OH)+NH_(3) rarr MnO_(2)+NH_(4)^(+)+2e^(-)`.

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