What does a negative e.m.f. for a cell indicate?

Electrons flow through the external circuit in the reverse direction.

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The opposite half-cell reactions take place spontaneously.

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The reactions as written are not spontanceous

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All of the above.

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Solution

The correct option is D
All of the above.

EMF of the cell is always difference in higher reduction potential and lower reduction potential.

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In a galvanic cell, the reactions taking place in the anodic half cell and the cathodic half cell will be:

The EMF of the Daniell cell is 1.1V . The external EMF to be applied for the following reaction to take place in it is:

$C u (s) + Z n {(a q)}^{2 +} \to C u {(a q)}^{2 +} + Z n (s)$

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