The standard reduction potential at 298 K for the following half cell reaction- Zn2-aq-2e- ZnsEo-0-762V Cr3-aq-3e- CrsEo-0-740V 2H-aq-2e- H2gEo-0-0V F2q-2e- 2F-aqEo-2-87VWhich of the following is the strongest reducing agent-

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The standard ...

Question

The standard reduction potential at $298$ K for the following half cell reaction:

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

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

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

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

Which of the following is the strongest reducing agent?

H_{2 (g)}

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Z n_{(s)}

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F_{2 (g)}

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C r_{(s)}

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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); 0.000

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

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

25^{o}

Z n^{2 +} (a q) + 2 e^{-} ⇌ Z n (s), - 0.76

C r^{3 +} (a q) + 3 e^{-} ⇌ C r (s), - 0.74

2 H^{+} (a q) + 2 e^{-} ⇌ H_{2} (g), + 0.0

F e^{3 +} (a q) + e^{-} ⇌ F e^{2 +} (a q), 0.77

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 V

C r^{3 +} (a q) + 3 e^{-} ⇌ C r (s);

- 0.74 V

2 H^{+} (a q) + 2 e^{-} ⇌ H_{2} (g);

+ 0.00 V

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

+ 0.77 V

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