Chemistry
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.
Related Questions
Select the correct answer — The aqueous solution of the compound which contains both ions and molecules is:
- Sulphuric acid
- Hydrochloric acid
- Nitric acid
- 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.
During the electrolysis of molten lead bromide, which of the following takes place ?
- Bromine is released at the cathode
- Lead is deposited at the anode
- Bromine ions gain electrons
- Lead is deposited at the cathode
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 ?