Electrochemistry Part 2

‌ECu2+∕Cu∘=0.34V,EZn2+∕Zn∘=−0.76V
‌EAg2+∕Ag∘=0.80V,EMg2+∕Mg∘=−2.37V
Most negative ∆G∘ value among the given cells in options is of (1)
‌E∘=0.8+0.76=1.56
‌∴∆G∘=−2×F×1.56
‌∆G∘=−3.12FV
In case of option (2) and (3), E∘=−ve
∴‌‌∆G∘=+‌ ve value ‌,
And ∆G∘ for option (4) will come out to be -0.92 FV , which is less negative than in option (1).