Question

When X gas is passed through lime water, it turns milky. The milkiness is caused due to the formation of Y. Identify X and Y from the following.

• A. $Ca(OH{)}_2$
• B. $H_{2}O$
• C. $CaC{O}_3$
• D. $H_2$

Answer 1

The correct option is C

$CaC{O}_3$

When ${\text{CO}}_2$ is passed through lime water, it turns milky due to the formation of a white insoluble suspension of ${\text{CaCO}}_3$, which is also known as limestone.

$Ca\left(OH{)}_2\right(aq)+C{O}_2(g)\to CaC{O}_3(s)+H_{2}O(l)$