Question

Which of the following compound is obtained when quicklime reacts with water?

• A. ${\text{Ca(NO}}_3{)}_2$
• B. ${\text{Ca(HCO}}_3{)}_2$
• C. ${\text{Ca(OH)}}_2$
• D. ${\text{CaCO}}_3$

Answer 1

The correct option is C ${\text{Ca(OH)}}_2$

Slaked lime $\left({\text{Ca(OH)}}_2\right)$ is formed when quicklime $\left(\text{CaO}\right)$ reacts with water. The equation of the reaction is given below:

$\text{CaO(s)}+{\text{H}}_2\text{O(l)}\to {\text{Ca(OH)}}_2\text{(aq)}+\text{Heat}$

This is an example of a combination reaction because there is only one product that is being formed from the reaction between the two reactants.