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Oxidation and Reduction

The standard ...

Question

The standard reduction potentials at $298 K$ for the following half reactions are given against each. Which will be the strongest reducing agent,among the following:
$Z n^{2 +} (a q) + 2 e^{-} ⇌ Z n (s) - 0.762 C r^{3 +} (a q) + 3 e ⇌ C r (s) - 0.740 2 H^{+} (a q) + 2 e^{-} ⇌ H_{2} (g) 0.00 F e^{3 -} (a q) + e^{-} ⇌ F e^{2 +} (a g) 0.770$

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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Solution

The correct option is A
$Z n (s)$
$Z n^{2 +} (a q)$ is having minimum reduction potential. So oxidation potential of $Z n (s)$ will be maximum and it will be strongest reducing agent.

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Similar questions

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^{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]

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_{(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

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