[CPMT 1973]
A) Dissolving in hot conc. $ H_2SO_4 $
B) The action of dil. $ H_2SO_4 $ and air
C) Heating with sodium sulphate
D) Heating with sulphur
Correct Answer: B
$ 2Cu+2H_2SO_4+O_2\to 2CuSO_4+2H_2O $
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