Why co2 and so2 cannot be distinguished by using lime water

Dear Student

When we pass lime water through CO2 and SO2, they both turn milky. That is why CO2 and SO2 cannot be distinguished using lime water test.
Instead, the following test is used to distinguish between them:
SO2 gas turns acidified potassium dichromate solution from orange to green but CO2 gas does not have any effect on it.

Regards

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