Which one among the following is the strongest reducing agent- Fe 2-2 e - Fe -0-44 V Ni 2-2 e - Ni -0-25 V Sn 2-2 e - Sn -0-14 V Fe 3- e - F e 2-0-77 V A- Fe 2-B- F eC- NiD- Sn

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Oxidation and Reduction

Which one amo...

Question

Which one among the following is the strongest reducing agent?
$F e^{2 +} + 2 e^{-} \to F e (- 0.44 V)$
$N i^{2 +} + 2 e^{-} \to N i (- 0.25 V)$
$S n^{2 +} + 2 e^{-} \to S n (- 0.14 V)$
$F e^{3 +} + e^{-} \to F e^{2 +} (+ 0.77 V)$

F e

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F e^{2 +}

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N i

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S n

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Solution

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F e^{2 +} + 2 e^{-} \to F e (- 0.44 V)

N i^{2 +} + 2 e^{-} \to N i (- 0.25 V)

S n^{2 +} + 2 e^{-} \to S n (- 0.14 V)

F e^{3 +} + e^{-} \to F e^{2 +} (+ 0.77 V)

Z n^{2 +} (a q .) + 2 e ⇌ Z n (s); - 0.762

C r^{3 +} (a q) + 3 e ⇌ C r (s); - 0.740

2 H^{+} (a q) + 2 e ⇌ H_{2} (g); 0.00

F e^{3 +} (a q) + e ⇌ F e^{2 +} (a q); 0.770

F e^{2 +} + 2 e^{-} \to F e

E^{\circ} = - 0.44 V

C u^{2 +} + 2 e^{-} \to C u

E^{\circ} = + 0.34 V

E^{\circ}

F e + C u^{2 +} ⇋ F e^{2} + C u

Z n^{2 +} (a q) + 2 e ⇌ Z n (s) - 0.762

C r^{3 +} (a q) + 2 e ⇌ C r (s) - 0.740

2 H^{+} (a q) + 2 e ⇌ H_{2} (g) 0.000

F e^{3 +} (a q) + 2 e ⇌ F e^{2 +} (a q) 0.770

E^{⊝}

Z n \to Z n^{2 +} + 2 e^{-}; E^{⊝} = + 0.76 V

F e \to F e^{2 +} + 2 e^{-}; E^{⊝} = 0.41 V

F e^{2 +} Z n \to Z n^{2 +} + F e

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