The standard reduction potential at 298 K for the following half cell reaction Zn aq 2-2 e - Zn s E -0-762 VCr aq 3-3 e - Cr s E -0-740 V2 H aq -2 e - H 2 g E -0-0 VF 2 g -2 e - 2 F aq - E -2-87 VWhich of the following is the strongest reducing agent-A- Zn s B- Cr s C- H 2 g D- F 2 g

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Faraday's Second Law

The standard ...

Question

The standard reduction potential at 298 K for the following half cell reaction
$Z n_{(a q)}^{2 +} + 2 e \to Z n_{(s)} E^{\circ} = - 0.762 V$
$C r_{(a q)}^{3 +} + 3 e \to C r_{(s)} E^{\circ} = 0.740 V$
$2 H_{(a q)}^{+} + 2 e \to H_{2 (g)} E^{\circ} = 0.0 V$
$F_{2 (g)} + 2 e \to 2 F_{(a q)}^{-} E^{\circ} = 2.87 V$
Which of the following is the strongest reducing agent?

Z n_{(s)}

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C r_{(s)}

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H_{2 (g)}

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F_{2 (g)}

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

E^{\circ}

- 0.762 V

C r_{(a q)}^{3 +} + 3 e^{-} ⇌ C r_{(s)}

E^{\circ}

- 0.740 V

2 H_{(a q)}^{+} + 2 e^{-} ⇌ H_{2 (g)}

E^{\circ}

0.000 V

F e_{(a q)}^{3 +} + e^{-} ⇌ F e_{(s)}^{2 +}

E^{\circ}

0.770 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

The standard reduction potentials at 298 K for the following half reactions are given against each

[IIT 1981; MP PET/PMT 1988; MP PMT 1989;MH CET 2001]

298

Z n_{(a q)}^{2 +} + 2 e \to Z n_{(s)} E^{o} = - 0.762

C r_{(a q)}^{3 +} + 3 e \to C r_{(s)} E^{o} = 0.740

2 H_{(a q)}^{+} + 2 e \to H_{2 (g)} E^{o} = 0.0

F_{2 (q)} + 2 e \to 2 F_{(a q)}^{-} E^{o} = 2.87

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

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