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The standard reduction potential data at 25ºC is given below. Eº (Fe 3+ , Fe 2+ ) = + 0.77 V; Eº (Fe 2+ , Fe) = – 0.44 V; Eº (Cu 2+ , Cu) = + 0.34 V; Eº (Cu + , Cu) = + 0.52 V; Eº (O 2 (g) + 4H + + 4e – → 2H 2 O) = + 1.23 V; Eº (O 2 (g) + 2H 2 O + 4e – → 4OH – ) = + 0.40 V; Eº (Cr 3+ , Cr) = – 0.74 V; Eº (Cr 2+ , Cr) = – 0.91 V Match Eº 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. Eº(Fe 3+ , Fe) 1. – 0.18 V Q. Eº(4H 2 O 4H + + 4OH – ) 2. – 0.4 V R. Eº(Cu 2+ + Cu → 2Cu + ) 3. – 0.04 V S. Eº(Cr 3+ , Cr 2+ ) 4. – 0.83 V Codes : P Q R S

1. 4 1 2 3
2. 2 3 4 1
3. 1 2 3 4
4. 3 4 1 2

Correct answer: 3 4 1 2

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