The EMF of a chemical cell is positive when free energy change of reaction

< 0

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> 0

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no relationship of free enrgy change and e.m.f.

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Solution

The correct option is A
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Q

△ G

E_{c e l l}

(Δ G)

Z n {/ Z n}^{2 +} ∥ {N i}^{2 +} / N

E^{o}

{Z n}^{2 +} / Z n = - 0.76 V

E^{o}

{N i}^{2 +} / N i = - 0.25 V

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

1.1 V

- 216.7 k J {m o l}^{- 1}

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