Here is an electrode reaction:

Cu ⟶ Cu²⁺ + 2e^-. [i.e. Cu – 2e^- ⟶ Cu²⁺]

At which electrode (anode or cathode) would such a reaction take place ? Is this an example of oxidation or reduction ?

A soln. contains Mg²⁺ ions, Fe²⁺ ions and Cu²⁺ ions. On passing an electric current through this soln. which ions will be the first to be discharged at the cathode? Write the equation for the cathode reaction.

Select the correct answer — The aqueous solution of the compound which contains both ions and molecules is:

1. Sulphuric acid
2. Hydrochloric acid
3. Nitric acid
4. Acetic acid

(A) Sulphur

(B) Silver chloride

(C) Hydrogen chloride

(D) Copper [II] sulphate

(E) Graphite

State which from A to E fits the description — 'A pink metal is deposited at the cathode during the electrolysis of the soln. of this salt.