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In the extraction of aluminium:
i. Name the process of concentration of bauxite.
ii. Write the cathode reaction in electrolytic reduction of alumina.
iii. Write the function and formula of cryolite in the extraction of aluminium.
iv. Draw the diagram for the extraction of aluminium.
A man went door to door posing as a goldsmith. He promised to bring back the glitter of old and dull gold ornaments. An unsuspecting lady gave a set of gold bangles to him which he dipped in a particular solution. The bangles sparkled like new but their weight was reduced drastically. The lady was upset but after a futile argument the man beat a hasty retreat. Can you play the detective to find out the nature of the solution he had used?