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Standard X

Chemistry

Electrolysis and Electrolytes

In the beginn...

Question

In the beginning of the electrolysis of aqueous copper sulphate solution, the substances evolved at cathode and anode are resepectively :

C u

and

O_{2}

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H_{2}

and

O_{2}

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C u

and

H_{2}

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H_{2}

and

C u

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Solution

The correct option is C $C u$ and $O_{2}$
The discharge potential of ${C u}^{2 +}$ ions is lower than $H^{+}$ ions. Hence ${C u}^{2 +}$ ions will be liberated at cathode in preference to $H^{+}$ ions.
The discharge potential of ${O H}^{-}$ ions is lower than ${S O}_{4}^{2 -}$ ions. Hence ${O H}^{-}$ ions will be liberated at anode (in the form of $O_{2}$ molecule) in preference to ${S O}_{4}^{2 -}$ ions.

Option A is correct.

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Similar questions

During another seven minutes of electrolysis of aqueous copper sulphate solution after complete reduction of Cu ion, the substances evolved at cathode and anode are respectively:

Aqueous $C u S O_{4}$ is electrolyzed using $A g$ as anode and $C u$ as cathode, then product of electrolysis at anode and cathode are, respectively

Q. Assertion: Starting from aq. copper [II] sulphate solution, equations for the reactions at the cathode and anode during electrolysis of aq.

C u S O_{4}

using active copper electrodes is;
at anode:

C u^{+ 2} + 2 e^{-} \to C u

at cathode:

C u \to C u^{+ 2} + 2 e^{-}

Reason: Oxidation always take place at anode and reduction at cathode.

Q. In a fuel cell,

H_{2}

and

O_{2}

react to produce electricity. In the process,

H_{2}

gas is oxidized at the anode and

O_{2}

gas is reduced at the cathode. If

67.2 litres

H_{2}

S T P

react in 15 minutes and the entire current is used for electrode deposition of

C u

from

C u (I I)

solution, how many grams of

C u

will be deposited and what is the average current produced?
Anode :

H_{2} + 2 O H^{-} \to 2 H_{2} O + 2 e^{-}

Cathode :

O_{2} + 2 H_{2} O + 4 e^{-} \to 4 O H^{-}

In a fuel cell, H2& O2 react to produce electricity. In the process, H2 gas is oxidized at the anode & O2 at the cathode . If 67.2 litre of H2 at STP react in 15 minutes, If the entire current is used for electrode deposition of Cu from Cu (II) solution, how many grams of Cu will be deposited?

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