Electrolysis of which of the following aqueous solutions is not associated with the liberation of hydrogen gas at cathode?

N a C l

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C u {C l}_{2}

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Z n {S O}_{4}

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Both

(A)

and

(B)

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Solution

The correct option is D $C u {C l}_{2}$
Solutions in water contain hydrogen and hydroxide ions as well as the ions of the solute. These $H^{+}$ and $O H^{-}$ ions compete at the electrodes with the solute ions.The ions that are successfully released at the electrodes depend on three factors:
The position of the ion in the electrochemical series.
The concentration of the ion in the solution.
The nature of the electrode.
Copper equilibrium has an electrode potential of +0.34 V. This is more positive than hydrogens electrode potential of 0.00 V. This means that copper ions are more easily reduced (i.e. have more tendency to go to the right hand side) than hydrogen ions (as we go down the series the redox equilibria species on the left hand side have better oxidising properties, i.e they can remove electrons from other things more easily - including electrodes). Consequently in a competition between the two ions the copper ions will preferentially pick up the electrons.

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Similar questions

Which of the following statements are correct?

a) The electrolysis of aqueous NaCl produces hydrogen gas at the cathode and chlorine gas at the anode .

b) The electrolysis of a $C u S O_{4}$ solution using Pt electrodes causes the liberation of $O_{2}$ at the anode and the deposition of copper at the cathode .

c) Oxygen and hydrogen are produced at the anode and cathode during the electrolysis of dilute aqueous solution of $H_{2} S O_{4}$ .

d) All electrolytic reactions are redox reactions .

Q. In the electrolysis of an aqueous solution of

N a O H, 2.8 l i t r e

of oxygen gas at NTP was liberated at anode. How much of hydrogen gas was liberated at cathode?

Q. Give reasons:
On the basis of

E^{o}

values,

O_{2}

gas should be liberated at anode but it is

C l_{2}

gas which is liberated in the electrolysis of aqueous NaCl.

Which of the following substance gets liberated at the anode during the electrolysis of aqueous NaCl?

Q. Electrolysis of dilute aqueous solution of NaCl was carried out by passing 10 milliampere current. The time required to liberate 0.01 mole

H_{2}

gas at cathode is:

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