Standard electrode potential for Sn4+/Sn2+ couple is +0.15 V and that for the Cr3+/Cr couple is –0.74V. These two couples in their standard state are connected to make a cell. The cell potential will be: [AIPMT 2011]

o o o cell cathode anode E E E 0.15 0.74 0.89V 10. If the cell E for a given reaction has a negative value, which of the following gives correct relationship for the values of ∆Gº and Keq? [NEET Phase II 2017] [CBSE AIPMT 2011] (a) ∆Gº > 0; Keq < 1 (b) ∆Gº > 0; Keq > 1 (c) ∆Gº < 0; Keq > 1 (d) ∆Gº < 0; Keq < 1 Given, cell E = –ve Now, the relation between ∆Gº and cell Eis given as, cell G nFE …(i) as cell E is negative, so ∆Gº comes out to be positive. Again, relation between ∆Gº and Keq is given as eq G 2.303nRTlogK …(ii) From Eq. (i) we get that ∆Gº is positive