The standard reduction potential at 298 K for the following half all reactions are given below-Cr -3- aq -3 e - - rightarrow Cr s - E - 0-0-740 V 2 H - aq -2 e - - rightarrow H - 2 g - E - 0-0-0 V IFe -3- aq - e - rightarrow -Fe -2- aq - E - 0-0-77 V Which is the strongest reducing agent-A- Fe 2- aq B- Zn s C- Cr s D- H 2 g

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Electrolysis and Electrolytes

The standard ...

Question

The standard reduction potential at 298 K for the following half all reactions are given below:
$Z n^{2 +} (a q) + 2 e^{-} \to Z n (s), E^{0} = - 0.762 V C r^{3 +} (a q) + 3 e^{-} \to C r (s), E^{0} = - 0.740 V 2 H^{+} (a q) + 2 e^{-} \to H_{2} (g), E^{0} = 0.0 V F e^{3 +} (a q) + e^{-} \to F e^{2 +} (a q), E^{0} = 0.77 V$
Which 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 e^{2 +} (a q)

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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); 0.00

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

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

M^{2 +} / M and M^{3 +} / M^{2 +}

E^{0}

C r^{2 +} (a q) + 2 e^{-} \to C r (s); E^{0} = - 0.91 V C r^{3 +} (a q) + e^{-} \to C r^{2 +} (a q); E^{0} = - 0.41 V

M n^{2 +} (a q) + 2 e^{-} \to M n (s); E^{0} = - 1.2 V M n^{3 +} (a q) + e^{-} \to M n^{2 +} (a q); E^{0} = + 1.51 V

F e^{2 +} (a q) + 2 e^{-} \to F e (s); E^{0} = - 0.44 V F e^{3 +} (a q) + e^{-} \to F e^{2 +} (a q); E^{0} = + 0.77 V

298 K

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

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

2 H^{+} (a q) + 2 e ⇌ H_{2} (g); 0.00 V

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

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