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Standard XII

Chemistry

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A solution co...

Question

A solution contains magnesium ions ( ${M g}^{2 +}$ ), iron (II) ions ( ${F e}^{2 +}$ ) and copper ions ( ${C u}^{2 +}$ ). On passing an electric current through this solution, which ions will be the first to be discharged at the cathode?

{C u}^{2 +}

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{M g}^{2 +}

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{F e}^{2 +}

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{F e}^{2 +}

and

{M g}^{2 +}

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Solution

The correct option is A ${C u}^{2 +}$
As $M g^{+ 2}$ have highest reduction potential so it will reduce first and reaction at cathode
$M g^{+ 2} + 2 e^{-} \to M g$

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Similar questions

Q. (a) Here is an electrode reaction:
Cu → Cu²⁺ + 2e.
At which electrode (anode or cathode) would such a reaction take place? Is this an example of oxidation?
(b) A solution contains magnesium ions (Mg²⁺), iron (II) ions (Fe²⁺) and copper ions (Cu²⁺). On passing an electric current through this solution which ions will be the first to be discharged at the cathode? Write the equation for the cathode reaction.
(c) Why is carbon tetrachloride, which is a liquid, a non-electrolyte?

(a) Here is an electrode reaction :

$C u \to C u^{2 +} + 2 e^{-}$ . At which electrode (anode or cathode) would such a reaction take place? Is this an example of oxidation or reduction ?

(b) A solution contains magnesium ions $(M g^{2 +})$ , iron (II) ions $F e^{2 +}$ and copper ions $C u^{2 +}$ . On passing an electric current through this solution, which ions will be the first to be discharged at the cathode? Write the equation for the cathode reaction.

(d) During the electrolysis of molten lead bromide, which of the following takes place ?

A. Bromine is released at the cathode,

B. Lead is deposited at the anode,

C. Bromine ions gain electrons,

D. Lead is deposited at the cathode.

Q. Given ions are :

F e^{2 +}, N i^{2 +}, C a^{2 +}, K^{+}, M g^{2 +}, N a^{+}, C u^{2 +}, Z n^{2 +}

.
If all the given ions can form complexes then enter 1, else enter 0.

Q. Among

M g^{2 +}

F e^{2 +}

Z n^{2 +}

and

C u^{2 +}

which will get reduced first.

Q. Both

M g

and

F e

metal can reduce copper from a solution having

C u^{2 +}

ion, according to equilibria.

M g_{(s)} + C u^{2 +} ⇋ M g^{2 +} + C u_{(s)}; K_{1} = 6 \times 10^{90}

F e_{(s)} + C u^{2 +} ⇋ F e^{2 +} + C u_{(s)}; K_{2} = 3 \times 10^{26}

Choose the correct option regarding above equilibrium.

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A solution contains magnesium ions ( Mg2+), iron (II) ions (Fe2+) and copper ions (Cu2+). On passing an electric current through this solution, which ions will be the first to be discharged at the cathode?

The correct option is A Cu2+As Mg+2 have highest reduction potential so it will reduce first and reaction at cathodeMg+2+2e−→Mg

A solution contains magnesium ions ( ${M g}^{2 +}$ ), iron (II) ions ( ${F e}^{2 +}$ ) and copper ions ( ${C u}^{2 +}$ ). On passing an electric current through this solution, which ions will be the first to be discharged at the cathode?

The correct option is A ${C u}^{2 +}$
As $M g^{+ 2}$ have highest reduction potential so it will reduce first and reaction at cathode
$M g^{+ 2} + 2 e^{-} \to M g$