Chemistry
CO2 and SO2 gas can be distinguished using :
- moist blue litmus paper
- lime water
- acidified K2Cr2O7 paper
- none of the above.
Practical Chemistry
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Answer
acidified K2Cr2O7 (potassium dichromate) paper
Reason
There is no effect of CO2 gas on potassium dichromate whereas SO2 turns acidified potassium dichromate from orange to clear green.
K2Cr2O7 + H2SO4 + 3SO2 ⟶ K2SO4 + Cr2(SO4)3 + H2O
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