ChemistryAirJAMB
Which gas turns lime water milky but has NO effect on acidified potassium heptaoxodichromate(VI)?
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Answer: C. carbon(IV) oxide
Both CO₂ and SO₂ turn lime water milky, but only SO₂ turns the orange dichromate green.
An AdmitMe practice question, written for the JAMB syllabus. Not an official past question.