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प्रश्न
Explain the following:
On electrolysis of dilute copper (II) sulphate solution, copper is deposited at the cathode but no hydrogen gas evolves there. Explain why?
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उत्तर
Copper ions (Cu2+) and hydrogen ions (H+) both shift to the cathode, but copper is deposited at the cathode more readily than hydrogen due to its lower position in the electrochemical series. Copper is discharged at the cathode in preference to hydrogen.
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संबंधित प्रश्न
Select the ion in the following case, that would get selectively discharged from the aqueous mixture of the ions listed below:
\[\ce{SO^2-_4, NO^-_3 {and} OH-}\]
Select the ion in the following case, that would get selectively discharged from the aqueous mixture of the ions listed below:
Pb2+, Ag+ and Cu2+
Name two substances in the following case:
Contain only ions.
Explain the following:
When a dilute aqueous solution of sodium chloride is electrolysed between platinum electrodes, hydrogen gas is evolved at the cathode but metallic sodium is not deposited. Why?
Arrange the following according to the instruction given in bracket:
Cu2+, Na+, Zn2+, Ag+ (The order of Preferential discharge at the cathode)
