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Which device ...

Question

Which device is used to measure exact value of cell-potential of an electrochemical cell?

A

Galvanometer

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B

Ammeter

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C

Potentiometer

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D

Voltmeter

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Solution

The correct option is A Potentiometer
The potentiometer is used to measure the exact value of the cell-potential of an electrochemical cell.
Poggendorff's compensation method is used.
$E_{x} = E_{s} \frac{l (A D^{'})}{l (A D)}$ .

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