Page 218 - ICSE Chemistry 8

In case of carbon monoxide poisoning:
• Take the person into an open area immediately.

• Give ar fi cial respira on with carbogen (95% oxygen + 5% carbon dioxide).

How is Carbon Monoxide Added to the Atmosphere?

• Incomplete burning of fuels: The burning of fuels such as coal, coke and charcoal in a limited
supply of air or oxygen leads to the forma on of carbon monoxide. Air or oxygen reacts with
carbon and forms carbon dioxide. The carbon dioxide formed on passing through red-hot coal or
coke converts to carbon monoxide.
C + O CO 2 + Heat
2
Carbon Oxygen Carbon dioxide

CO 2 + C 2CO
Carbon dioxide Carbon Carbon monoxide
• Exhaust fumes: The complete combus on of fuels consis ng of hydrocarbons leads to the forma on
of water and carbon dioxide. Carbon monoxide is formed when hydrocarbon fuels are burnt in a
limited supply of air. This takes place generally in the engines of automobiles and therefore the
automobile exhaust gases contain carbon monoxide.

Wood is only 50–55% fuel. Burning of wood is an incomplete combus on and it emits harmful smoke.
Thus, the Government of India is constantly making eff orts to spread the use of Liquefi ed Petroleum
Gas (LPG) as a cooking fuel by coming up with the schemes like Pradhan Mantri Ujjwala Yojana (PMUY).
PMUY aims at providing clean cooking fuel to the households below poverty line.

Take a Break!

Answer in one word.

1. A colourless gas that cons tutes about 0.04% of air by volume _________________

2. The scien st who discovered carbon dioxide gas _________________
3. A mixture of 5% carbon and 95% oxygen _________________
4. An oxide of carbon which is a highly poisonous gas _________________

5. A compound formed when carbon monoxide combines with
haemoglobin present in the blood _________________

Terms to Know

Organic compounds: The compounds of carbon of biological origin

Allotropes: The various physical forms in which an element can exist
Allotropy: The phenomenon of existence of an element in more than one form in the same
physical state

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