State reasons for the following observations
a) The shining surface of some metals becomes doll when exposed to ait for a long time
() Zinc fails to evolve hydrogen gas on reacting with dilute nitric acid.
(c) Metal sulphides occur mainly in rocks but metal halides our mostly in sea and lake waters.
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answer 1 because they react with air form layer which cause shining dull.
because it evolve h2 gas.
metal sulphide are of least reactive while metal halides by the halogens
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