Question

The formulae of the components present in soda lime are-
A.$NaOH$ , $KOH$
B.$N{a_2}C{O_2}$ , $Ca{\left( {OH} \right)_2}$
C.$NaOH$ , $CaO$
D.$NaOH$, $Ca{\left( {OH} \right)_2}$

Answer 1

Soda lime is white coloured solid. It is a non-combustible, highly toxic substance which is corrosive for metals and tissues of our body as it is formed from two corrosive materials.

Step-by-Step Solution
The molecular formula of Soda lime is $CaHNa{O_2}$. It is a mixture of calcium hydroxide and sodium hydroxide. Calcium hydroxide is also called slaked lime and its chemical formula is $Ca{\left( {OH} \right)_2}$. When it reacts with sodium hydroxide then soda lime is formed. The reaction is given as-
$Ca{\left( {OH} \right)_2} + NaOH \to CaHNa{O_2} + {H_2}O$
Its properties are as follows-
1.It has the ability to absorb moisture and carbon dioxide from air.
2.It is corrosive and toxic.
3.It is poisonous for human beings as it damages gastrointestinal tract.
4.It deteriorates rapidly in contact with air.
Answer- The correct answer is D.

Additional Information: Calcium hydroxide is prepared by action of water on quicklime. Calcium oxide $\left( {CaO} \right)$ is known as quicklime. Quicklime is a white amorphous solid which reacts with water and gives calcium hydroxide. The uses of sodium hydroxide are-
1.It is used in petroleum refining.
2.It is used in purification of bauxite to extract aluminium.
3.It is used as a cleansing agent and in washing powder.

Note: The uses of soda lime are-
1.It is used in the manufacture of gas masks.
2.It is used in anesthesia breathing systems to absorb expired $C{O_2}$.
3.It is used as a drying agent in labs.
4.It is used in basal metabolism tests to absorb carbon.
5.It is used as an absorbent for toxic gases.