Question

---- is the compound which can remove both oxygen and nitrogen from the air when they are passed over it at ${{1000}^{\circ }}C$
A. $Ca{{C}_{2}}$
B. $CaC{{l}_{2}}$
C. $CaC{{N}_{2}}$
D. $Ca{{(CN)}_{2}}$

Answer 1

Hint: It is found that the compound which can remove both oxygen and nitrogen from the air is basically a colourless crystalline solid that is having a rock like structure at room temperature. It is used mainly in carbide lamps, and is used as a ripening agent like that of ethylene.

Complete Solution :
- It is found that when calcium carbide $Ca{{C}_{2}}$ reacts with oxygen then there is formation of calcium oxide and carbon dioxide takes place. We can see the reaction that takes place as:
\[Ca{{C}_{2}}+\frac{5}{2}{{O}_{2}}\to CaO+2C{{O}_{2}}\]

- It is also found that the nitrogen gas that is found in air can react with $Ca{{C}_{2}}$and produce calcium cyanamide $CaC{{N}_{2}}$
\[Ca{{C}_{2}}+{{N}_{2}}\to CaC{{N}_{2}}+C\]
 -$Ca{{C}_{2}}$ can consume the nitrogen and oxygen gases from air at ${{1000}^{\circ }}C$.
- Hence we can conclude that the correct option is (a), that is $Ca{{C}_{2}}$ is the compound which can remove both oxygen and nitrogen from the air when they are passed over it at ${{1000}^{\circ }}C$
So, the correct answer is “Option A”.

Additional information- Calcium carbide is produced in industries from coke and lime that are used as mixtures in an electric arc furnace. And a temperature is required at about ${{2200}^{\circ }}C$ .

Note: - As we know that calcium carbide when reacted with water produces calcium hydroxide and acetylene. It is also known as calcium acetylide, glycerol phenyl ether diacetate.
- It is also found that calcium carbide is used to produce calcium cyanamide, and is used in the process of desulphurization that is in the removal of sulphur from any material.