Chemistrymedium · Past Paper
Which of the following reactions is used to test for Carbon Dioxide gas?
A$CO_2 + H_2O \rightarrow H_2CO_3$
B$Ca(OH)_2 + CO_2 \rightarrow CaCO_3 + H_2O$
C$C + O_2 \rightarrow CO_2$
D$CH_4 + 2O_2 \rightarrow CO_2 + 2H_2O$
✓ Correct Answer: B — $Ca(OH)_2 + CO_2 \rightarrow CaCO_3 + H_2O$
Carbon dioxide turns limewater (calcium hydroxide) milky due to the formation of insoluble calcium carbonate.
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