Question : Air sample sujected to following tests. The anhydrous CuSO4 turned blue, the acidified KMnO4 was decolourised and white ppt was seen in limewater. Which of the following sets of gasas was present in the air sample? a) SO2, CO2 and H2O b) SO2, CO and H2O c) CO, H2 and H2O d) CO2, H2O and CO someone please tell me and explain why. thank you.