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An electrochemical cell is constructed w...

An electrochemical cell is constructed with an open switch as shown below:

when the switch is closed, mass of tin-electrode increases. If `E^(@) (Sn^(2+)//Sn) = 0.14V` and for `E^(@) (X^(n+)//X) =- 0.78V` and initial emf of the cell is `0.65V`, determine n and indicate the direction of electron flow in the external circuit.

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The correct Answer is:
`n=3`, since mass of `Sn` increasing `Sn`- electrode is working as cathode and X-metal electrode anode and electrons are flowing from X-electrode to Sn-electrode in the external circuit.
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