NOTE : For spontaneous reaction ∆G should be negative. Equilibrium constant should be more than one (∆G=−2.303RT‌log‌Kc. If Kc=1 then ∆G=0; If Kc<1 then ∆G=+ve). Again ∆G=−nFE‌cell ‌∘ E‌cell ‌∘ must be +ve to have ∆G−ve.
