6.Whichoneofthefollowingprocessesinvolvechemicalreactions?
(a)Storingofoxygengasunderpressureinagascylinder
(b)Liquefactionofair
(c)Keepingpetrolinachinadishintheopen
(d)Heatingcopperwireinpresenceofairathightemperature
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Answer:
(a)Storingofoxygengasunderpressureinagascylinder
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