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Electrochemical Series

The standard ...

Question

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

Which is the strongest reducing agent?
$Z n^{2 +} (a q .) + 2 e ⇌ Z n (s); - 0.762$
$C r^{3 +} (a q) + 3 e ⇌ C r (s); - 0.740$
$2 H^{+} (a q) + 2 e ⇌ H_{2} (g); 0.00$
$F e^{3 +} (a q) + e ⇌ F e^{2 +} (a q); 0.770$

Z n (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 $Z n (s)$
More negative is the reduction potential, higher will be the reducing property, i.e. the power to give up electrons.

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Similar questions

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); 0.00

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

298 K

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

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); 0.000

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

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