What is the principle of electrochemical cell ?

What is the principle of electrochemical cell ?
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Ans .:- The cell works on the principle of redox reactions . One of the reactant undergoes oxidation while another undergoes reduction
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Two half-reactions of an electrochemical cell are given below : MnO–4 (aq) + 8H+ (aq) + 5e– → Mn2+ (aq) + 4H2O (I), E° = 1.51 V Sn2+ (aq) → Sn4+ (aq) + 2e–, E° = + 0.15 V. Construct the redox equation from the standard potential of the cell and predict if the reaction is reactant favoured or product favoured. -Chemistry

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