Question

Match the following.

Column A	Column B
1. preservation	A. source of nitrogen
2. fire extinguisher	B. argon gas
3. nitrates	C. carbon monoxide
4. electric bulb	D. neon gas
5. incomplete combustion of fossil fuels	E. CNG
	F. nitrogen
	G. carbon dioxide

Answer 1

1. Preservation - F. Nitrogen

• Nitrogen is a non-reactive gas.
• Therefore, it is filled in food packets to prevent food items from getting spoiled.

2. Fire extinguisher - G. Carbon dioxide

• Carbon dioxide gas is a non-supporter of combustion.
• Therefore, it is used in extinguishing fires by forming a blanket and cutting off the supply of oxygen.

3. Nitrates - A. Source of nitrogen

• Nitrogen is essential for the growth of an organism because proteins are made up of nitrogen.
• Atmospheric nitrogen cannot be used directly so it is converted into nitrates for easy absorption.

4. Electric bulb - B. Argon gas

• Argon is an inert gas that does not react at all.
• Argon is filled in electric bulbs to prevent oxidation of the filament in the bulb.

5. Incomplete combustion of fossil fuels - C. Carbon monoxide

• Incomplete combustion of fossil fuels takes place when the supply of oxygen is limited.
• This incomplete combustion of fuels releases carbon monoxide.
• During the complete combustion of fuels carbon dioxide is released.

The explanation for non-matching options -

D. Neon gas - It is an inert gas that is used in neon lights that produce a reddish-orange glow when electricity is passed through it.

E. CNG - It stands for compressed natural gas. It is a mixture of 80-90% methane and the rest is other hydrocarbons.

Column A	Column B
1. Preservation	F. Nitrogen
2. Fire extinguisher	G. Carbon dioxide
3. Nitrates	A. Source of nitrogen
4. Electric bulb	B. Argon gas
5. Incomplete combustion of fossil fuels	C. Carbon monoxide