Question

During the electrolysis of molten sodium chloride using platinum electrodes:

Answer 1

Platinum is not used for electrolysis of both molten and aqueous sodium chloride. While inert and all those features that make it a perfect electrode, it is way too expensive to use platinum as an electrode for commercial purposes. Rather, steel, graphite and titanium electrodes are used instead.

Molten sodium chloride yields sodium and chlorine gas by using a Downs cell. In a Downs cell, the cathode is iron/steel while the anode is graphite. 

On the other hand, electrolysis of aqueous sodium chloride yields chlorine, hydrogen and sodium hydroxide. Here, the anode used is titanium and the cathode used is steel.

You could use platinium but the costs generally prevent its use.