Chemistry
Ionisation energies of 4 elements A, B, C and D are 496, 403, 520 and 419 KJ/mol, respectively. If these elements belong to the same group in the Periodic Table, which element will occupy the top position in the group? Justify your answer.
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During the extraction of aluminium bauxite, its principal ore is reduced by the electrolytic method. Why?
Why is pure acetic acid also called glacial acetic acid?
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.