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What is the role of ZnCl(2) in dry cell ...

What is the role of `ZnCl_(2)` in dry cell ?

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`ZnCl_2` combines with `NH_(3)` produced to form the complex `[Zn (NH_(3))_(2) Cl_(2)]` , otherwise the pressure developed due to `NH_(3)` would crack the seal of the cell.
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