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Standard Electrode Potentials

Molten mixtur...

Question

Molten mixture contains $M g^{2 +}$ , $N a^{+}$ and $C a^{2 +}$ but at cathode only $M g^{2 +}$ is discharged because

Standard reduction potential of

M g^{2 +}

is least among the three

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Standard oxidation potential of

M g

is the least among the three

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Discharge potential of

M g^{2 +}

is highest

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None of the above

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Solution

The correct option is B Standard oxidation potential of $M g$ is the least among the three
Higher is the standard oxidation potential of an ion, higher will be the voltage required for its discharge.
Thus ion having lowest standard oxidation potential will discharge preferentially.
The standard oxidation potential of Mg is the least among the three.

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Similar questions

Q. The standard reduction potential for

M g^{2 +} / M g

- 2.37 V

and for

C u^{2 +} / C u

0.337

. The

E_{c e l l}^{o}

for the following reaction is

M g + C u^{2 +} \to M g^{2 +} + C u

The standard reduction potentials at $25^{0}$ C of $L i^{+}$ /Li , $B a^{2 +}$ /Ba , $N a^{+}$ /Na and $M g^{2 +}$ /Mg are -3.05 , -2.73 , -2.71 and -2.37 volt respectively. Which one of the following is the strongest oxidizing agent?

Q. The standard reduction potential of

L i^{+}

| Li,

B a^{2 +}

| Ba,

N a^{+}

| Na and

M g^{2 +}

| Mg are

- 3.05

- 2.73

- 2.71

, and

- 2.37

volts, respectively. Which one of the following is the strongest oxidizing agent?

Q. Arrange the following ions in increasing

N a^{+}, M g^{2 +}, A l^{3 +}

standard reduction potential

(E_{r e d n}^{o}),

M^{n +} (a q) + n e^{-} \to M (s)

Q. How would you determine the standard electrode potential of the

M g^{2 +}

| M g

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Molten mixture contains Mg2+, Na+ and Ca2+ but at cathode only Mg2+ is discharged because

Molten mixture contains $M g^{2 +}$ , $N a^{+}$ and $C a^{2 +}$ but at cathode only $M g^{2 +}$ is discharged because