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A sample of air contaminated with carbon monoxide and sulphur dioxide was passed through the apparatus shown in the diagram below.

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A sample of air contaminated with carbon monoxide and sulphur dioxide was passed through the apparatus shown in the diagram below.
sample of air contaminated with carbon monoxide and sulphur dioxide
Which contaminant was removed by passing the contaminated air through the apparatus?
Explain.

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Sulphur(IV)Oxide
Carbon(II)Oxide gas does not react with lime water  nor Conc. H2SO4 but SO2 being acidic is absorbed by the lime water.

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