Question

if emf of cell is positive, the reaction is ....
a. Spontaneous
b. Non-spontaneous
c. Endothermic
d. Exothermic​

Answer 1

Explanation:

Spontaneous

hope it will help you

Answer 2

Answer:

Spontaneous

Explanation:

If EMF of cell is positive, then the Δ G of the overall reaction is less than zero.

ΔG=−nFEcell​

∴ If Ecell​ is positive, then reaction is spontaneous

It is customary to give a cell's emf a positive number when it is expressed in shorthand notation to indicate spontaneous cell reactions.

To put it another way, if the electrode on the left pushes electrons into the external circuit and the electrode on the right pulls them out, the dial on the voltmeter will indicate the cell's emf.

On the other hand, if the half-cell to the right of the abbreviated cell notation is discharging electrons, turning the right-hand terminal of the voltmeter negative, the cell emf is lower than the reading of the metre.

If stated in a traditional manner, this is equivalent to a nonspontaneous cell response.

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