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1. A man painted his main gate made up of iron, to

(i). prevent it from rusting.
(ii). protect it from sun.
(iii). make it look beautiful.
(iv). make it dust free.

Which of the above statement(s) is/are correct?
2. Iron pillar near the Qutub Minar in Delhi is famous for the following facts. Which of these facts is responsible for its long stability?