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28/10/2020 5:25 pm
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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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28/10/2020 5:26 pm
(d) Heating copper wire in presence of air at high temperature