To obtain pure carbon(ii)oxide from its mixture with carbon(iv)oxide; the mixture should be?

A. Passed over heated copper(ii)oxide
B. Bubbled through water
C. Bubbled through conc H₂SO₄
D. Bubbled through conc NaOH

Correct Answer:

Option D = Bubbled through conc NaOH

Explanation

Carbon(ii)oxide is prepared from carbon(iv)oxide by passing the latter through red-hot carbon and the unchanged CO₂ is removed when the mixture of the gases through conc NaOH.