Experts,in this question the answer should be option 3 instead of option 2 as (ii) and (iv) equation have largest potential(2.1-(-1.5))=3.6 V
Kindly check it .

Dear student, In the above mentioned problem, the equation (i) is E°ox=1.5V. (ii) is E°red = 2.1V. (iii) is E°red = 0.5V. (iv) is E°ox = -1.5V. As we all know, E°cell = E°ox + E°red. So, the combination of (i) and (ii) gives the largest potential which is equal to (1.5 + 2.1)V = 3.6V. In option (3), the sum of oxidation and reduction potential is equal to (2.1 - 1.5)V = 0.6V. Hence, the correct option is (2) and not (3). Regards.

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Yes bro u are right and is option 3
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