Question

Carbon exists in the atmosphere in the form of
(a) carbon monoxide only
(b) carbon monoxide in traces and carbon dioxide
(c) carbon dioxide only
(d) coal

NCERT Class X
Science - Exemplar Problems

Chapter_Carbon and its Compounds

Answer 1

‘Carbon’ exists in the ‘atmosphere’ in the form of ‘carbon dioxide’.

Explanation:

• Usually, the carbon is existed in this atmosphere in the form of ‘carbon dioxide’. The percentage it has in air is 0.03% only.  

• It can also be seen in the form of ‘minerals’ such as fossil fuels, carbonates, and other organic compounds.  

• The carbon monoxide could be produced by ‘incomplete combustion’ due to the controlled supply of oxygen.

• When the hydrocarbons like diesel and petrol are burnt, it is emitted as pollutants.

Learn more about carbon dioxide

Carbon dioxide which is a gas under normal conditions of temperature and pressure can be liquefied by compressing it to 70 atm at ordinary temperature. What happens when pressure is suddenly released?

https://brainly.in/question/435578

Why carbon dioxide is transported in the dissolve form in our blood as compared to oxygen?

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Answer 2

Explanation:

ANSWER

The layer of the Earth's atmosphere which contains a high concentration of ions and free electrons and is able to reflect radio waves. It lies above the mesosphere and extends from about 80 to 1,000 km above the Earth's surface is called ionosphere. In ionosphere, the main compounds are carbon dioxide and carbon monoxide. These are compounds containing carbon. Hence, option B is the correct answer