Chemistry

Carbon dioxide and sulphur dioxide gas can be distinguished by using :

(a) moist blue litmus paper

(b) lime water

(c) acidified potassium dichromate paper

(d) none of the above

Practical Chemistry

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Answer

acidified 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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