The standard reduction potentials at 298 K for the following half reactions are given-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 -0-000 VF e aq 3- e - F e s 2- E -0-770 VWhich is the strongest reducing agent- A- Zn s B- H 2 g C- F e aq 2-D- Cr s

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Standard XII

Chemistry

Electrochemical Series

The standard ...

Question

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

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

$C r_{(a q)}^{3 +} + 3 e^{-} ⇌ C r_{(s)}$ $E^{\circ}$ = $- 0.740 V$

$2 H_{(a q)}^{+} + 2 e^{-} ⇌ H_{2 (g)}$ $E^{\circ}$ = $0.000 V$

$F e_{(a q)}^{3 +} + e^{-} ⇌ F e_{(s)}^{2 +}$ $E^{\circ}$ = $0.770 V$

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_{(a q)}^{2 +}

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Solution

The correct option is A $Z n_{(s)}$
$E_{O P}^{\circ}$ for $Z n = + 0.762 V$ (maximum amongst the given values)

More the value of $E_{O P}^{\circ}$ , more is the tendency for the species to get oxidised, and hence the strongest reducing agent.

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Similar questions

Q. 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?

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

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