[AFMC 1987; BHU 1999; CBSE PMT 2000]
A) $ SO_2 $
B) $ SO_3 $
C) $ H_2S $
D) $ O_2 $
Correct Answer: A
$ Cu+2H_2SO_4\to CuSO_4+2H_2O+SO_2 $
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