The standard reduction potentials for the following reaction are Zn2-2e- Zn- -0-762V Cr3-3e- Cr- -0-74V 2H-2e- H2- 0-0V Fe3-e- Fe2- 0-77VThe reducing powers of these species are in the order-

The correct option is A Zn gt; Cr gt; H_2 gt; Fe^2+ The order of standard reduction potentials are: 0.77 V gt; 0.0 V gt; 0.74 V gt; ...

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Question

The standard reduction potentials for the following reaction are
$Z n^{2 +} + 2 e^{-} \to Z n; (- 0.762 V$ )
$C r^{3 +} + 3 e^{-} \to C r; (- 0.74 V$ )
$2 H^{+} + 2 e^{-} \to H_{2}; (0.0 V$ )
$F e^{3 +} + e^{-} \to F e^{2 +}; (0.77 V$ )
The reducing powers of these species are in the order:

Z n > C r > H_{2} > F e^{2 +}

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F e^{2 +} > H_{2} > C r > Z n

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H_{2} > Z n > C r > F e^{2 +}

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H_{2} > F e^{2 +} > C r > Z n

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Solution

The correct option is A $Z n > C r > H_{2} > F e^{2 +}$
The order of standard reduction potentials are: $0.77 V > 0.0 V > - 0.74 V > - 0.762 V$ . As the value of standard reduction potential becomes less positive and more negative, the value of reducing power increases.

Hence the reducing power decreases in the order: $Z n > C r > H_{2} > {F e}^{2 +}$ .
So, option A is correct.

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Similar questions

Q. The standard reduction potentials at 298 K for the following half-cell reactions are given:

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

Which one of the following is the strongest reducing agent?

Q. The standard reduction potentials at

298 K

for the following half reactions are given against each:

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

Which is the strongest reducing agent?

Given the standard reduction potentials:

Zn²⁺/Zn = - 0.74 V, Cl₂/Cl^- = 1.36 V, H⁺/1/2H₂ = 0 V and Fe³⁺/Fe²⁺ = 0.77 V.
The order of increasing strength as reducing agent is

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

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

Q. The standard reduction potentials at

25^{\circ} C

for the following half reactions are given against each;

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^{+} + 2 e^{-} ⇌ H_{2} (g); 0.00

F e^{3 +} + e^{-} ⇌ F e^{2 +}; 0.77

Which is the strongest reducing agent?

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The standard reduction potentials for the following reaction are Zn2++2e−→Zn;(−0.762V)Cr3++3e−→Cr;(−0.74V)2H++2e−→H2;(0.0V)Fe3++e−→Fe2+;(0.77V)The reducing powers of these species are in the order:

The standard reduction potentials for the following reaction are
$Z n^{2 +} + 2 e^{-} \to Z n; (- 0.762 V$ )
$C r^{3 +} + 3 e^{-} \to C r; (- 0.74 V$ )
$2 H^{+} + 2 e^{-} \to H_{2}; (0.0 V$ )
$F e^{3 +} + e^{-} \to F e^{2 +}; (0.77 V$ )
The reducing powers of these species are in the order: