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Which one of the following processes involve chemical reactions?(a) Storing of oxygen gas under pressure in a gas cylinder(b) Liquefaction of air(c) Keeping petrol in a china dish in the open(d) Heating copper wire in presence of air at high temperature |
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Answer» The correct option is (d) Heating copper wire in presence of air at high temperature When copper is heated in presence of air very slowly at high temperature, a layer of brown black copper oxide is formed which protect the copper from extensive corrosion. |
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