Hydrogen chloride fumes in the air. Justify.

During the extraction of aluminium bauxite, its principal ore is reduced by the electrolytic method. Why?

A fuse wire is an alloy made of tin and lead. It is a safety device that prevents the damage of electronic gadgets due to excessive flow of current. Can copper replace tin when making alloys? Justify your answer.

Ethyl alcohol is a colourless liquid. It is used as a major constituent in alcoholic beverages and also in the manufacture of many chemicals. When a Chemical Manufacturing Unit ordered ethyl alcohol, they were supplied with a purple-coloured alcohol instead of a colourless one.
State the reason and the purpose of this colour change.