Carbon cannot be used to reduce the oxide of sodium, magnetsium, calcium, etc.to their respective metals. State the method used for obtaining these metals from their salts. For obtaining sodium from its compound.
a. Name the salt used, gas produced, and the electrode at which the metal deposits.
b. Show the chemical reaction taking place during the process.
c. Name any two other metals which can be obtained from its compounds by the above method.

Explanation

The method used is electrolytic reduction.
a. Nacl (molten) Chlorine gas, and cathode.
b. `NaCl overset("electric current")(to)Na+ + Cl-`
At catode `Na+ + e-toNa`
At anode `2Cl-toC12+2e-`
c. Potassium and Aluminium.