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ICSE Class 10 Chemistry 2013 Paper

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Give a chemical test to distinguish between the following pairs of compounds :
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Question : 23 of 84
Marks: +1, -0
Carbon dioxide gas and sulphur dioxide gas.
Solution:  
Add acidified potassium dichromate solution SO2\mathrm{SO}_2 turns green whereas CO2\mathrm{CO}_2 does not change the colour.
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