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Application of Electrolysis

Which is the ...

Question

Which is the correct increasing order of reducing power of the given metals?
Standard electrode potentials:
$K^{+} + e^{-} \to K; E^{0} = - 2.93 V A g^{+} + e^{-} \to A g; E^{0} = 0.80 V H g_{2}^{2 +} + e^{-} \to 2 H g; E^{0} = 0.79 V M g^{2 +} + e^{-} \to M g; E^{0} = - 2.37 V C r^{3 +} + e^{-} \to C r; E^{0} = - 0.74 V$

A

K < M g < C r < H g < A g

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B

A g < H g < C r < M g < K

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C

H g < A g < C r < M g < K

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D

K < M g < C r < A g < H g

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Solution

The correct option is B $A g < H g < C r < M g < K$
Standard reduction potentials (SRP) of the half cell electrodes are calculated and arranged in a series of increasing order which is known as electrochemical series.
The standard electrode potential of $H^{+} / H_{2}$ couple is zero.

A positive $E^{0}$ signifies that it has high tendency to get reduced and the redox couple is a stronger oxidising agent than the $H^{+} / H_{2}$ couple.

Here, a negative $E^{0}$ signifies that it has high tendency to get oxidised and the redox couple is a stronger reducing agent than the $H^{+} / H_{2}$ couple.

Hence, the increasing order of reducing power of the metals are,
$A g < H g < C r < M g < K$

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Similar questions

Q. Given the standard electrode potentials,

K^{+} / K = - 2.93 V A g^{+} / A g = 0.80 V H g^{2 +} / H g = 0.79 V M g^{2 +} / M g = - 2.73 V C r^{3 +} / C r = - 0.74 V

The increasing order of reducing power is:

Q. Which of the following set of metal electrodes can be used in the given galvanic cell?
Given:

M g^{2 +} (a q) + 2 e^{-} \to M g (s); E^{0} = - 2.37 V

C u^{2 +} (a q) + 2 e^{-} \to C u (s); E^{0} = 0.34 V

A g^{+} (a q) + e^{-} \to A g (s); E^{0} = 0.80 V

Q. For a silver- magnesium voltaic cell,calculate the standard emf

(E_{c e l l}^{0})

M g^{2 +} + 2 e^{-} \to M g (s); E^{0} = - 2.37 V

A g^{+} (a q) + e^{-} \to A g (s); E^{0} = + 0.80 V

Q. Given the standard reduction potentials,

E_{K^{+} / K}^{\circ} = - 2.93 V, E_{A g^{+} / A g}^{\circ} = + 0.80 V, E_{H g^{2 +} / H g}^{\circ} = 0.79 V

E_{M g^{2 +} / M g}^{\circ} = - 2.37 V, E_{C r^{3 +} / C r}^{\circ} = - 0.74 V

.
The correct increasing order of reducing power is:

Q. For a silver- magnesium voltaic cell,
calculate the maximum useful work that can be obtained by operating the cell.

M g^{2 +} + 2 e^{-} \to M g (s); E^{0} = - 2.37 V

A g^{+} (a q) + e^{-} \to A g (s); E^{0} = + 0.80 V

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Application of Electrolysis

Standard X Chemistry

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