Question

The standard reduction potential data at $${25}^{o}C$$ is given below:

(i) $${ E }^{ o }\left( { Fe }^{ 3+ },{ Fe }^{ 2+ } \right) =-0.77V$$
(ii) $${ E }^{ o }\left( { Fe }^{ 2+ },{ Fe }^{ } \right) =-0.44V$$
(iii) $${ E }^{ o }\left( { Cu }^{ 2+ },{ Cu }^{ } \right) =+0.34V\quad $$
(iv) $${ E }^{ o }\left( { Cu }^{ + },{ Cu }^{ } \right) =+0.52V$$
(v) $${ E }^{ o }({ O }_{ 2\ (g)}+{ H }^{ + }+4e\rightarrow 4O{ H }^{ - })=+1.23V$$
(vi) $${ E }^{ o }({ O }_{ 2\ (g)}+2{ H }_{ 2 }O+4e\rightarrow 4{ OH }^{ - })=+0.40V$$
(vii) $${ E }^{ o }\left( { Cr }^{ 3+ },{ Cr }^{ } \right) =-0.74V$$
(viii) $${ E }^{ o }\left( { Cr }^{ 2+ },{ Cr }^{ } \right) =+0.91V\quad $$

Match $${E}^{o}$$ of the redox pair in List-I with the values given in List-II and select the correct answer using the code given below the lists

List I	List II
(P) $${E}^{o}({ Fe }^{ 3+ },{ Fe })$$	(1) $$-0.18V$$
(Q) $${E}^{o}(4{ H }_{ 2 }O\rightleftharpoons 4{ H }^{ + }+4{ OH }^{ - })$$	(2) $$-0.4V$$
(R) $${E}^{o}({ Cu }^{ + },{ Cu }\rightarrow 2{Cu}^{+})$$	(3) $$-0.04V$$
(S) $${E}^{o}({Cr}^{3+},{Cr}^{2+})$$	(4) $$-0.83V$$

Answer 1

Correct option is D. $$P-3; Q- 4; R-1; S-2$$