For the cell reaction to be spontaneous the EMF of the cell should be:
negative
positive
zero
some times positive and some times negative
A
some times positive and some times negative
B
negative
C
zero
D
positive
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Solution
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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
Hence, option B is correct.
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