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State reasons for the following observations: (i) The shining surface of some metals becomes dull when exposed to air for a long time. (ii) Zinc

State reasons for the following observations:
(i) The shining surface of some metals becomes dull when exposed to air for a long time.
(ii) Zinc fails to evolve hydrogen gas on reacting with dilute nitric acid.
(iii) Metal sulphides occur mainly in rocks but metal halides occur mostly in sea and lake waters.

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