Carbon exists in the atmosphere in the form of-
Carbon exists in the atmosphere in the form of-
The correct option is C Carbon dioxide only
The explanation for the correct option:
Carbon can exist in various forms. It can present in a combined state with other elements such as oxygen, hydrogen etc..,
It is present in the earth's crust, and atmosphere in the combined state.
(C) Carbon dioxide: Carbon exists in the atmosphere only in the form of carbon dioxide i.e., .It is present in the atmosphere in .
The explanation for the incorrect option:
(a) Carbon mono-oxide: It is a poisonous gas that forms when incomplete combustion of organic matters takes place.
When it enters the human respiratory system it has more affinity(200 times) towards haemoglobin and it combines with it and forms a stable compound which leads to suffocation and ultimate death of an organism.
(b) Carbon mono oxide in traces and carbon dioxide: It has been mentioned that carbon mono-oxide(CO) is a poisonous gas so even the traces of it is very harmful to living organisms.
(d) Coal: It is a mixture of carbon and other minerals. It is formed when living organisms(planta and animals) got buried under a rock or volcano where oxygen is not reaching and their oxidation is not possible, due to high pressure and non-availability of oxygen coal is formed.
The formation of coal is a very slow process it takes around 1000-1500 years and coal is a very good fuel.
Therefore, option(C) is correct. i.e., Carbon exists in the atmosphere in the form of carbon dioxide only.
Carbon dioxide only
The explanation for the correct option:
Carbon can exist in various forms. It can present in a combined state with other elements such as oxygen, hydrogen etc..,
It is present in the earth's crust, and atmosphere in the combined state.
(C) Carbon dioxide: Carbon exists in the atmosphere only in the form of carbon dioxide i.e., .It is present in the atmosphere in .
The explanation for the incorrect option:
(a) Carbon mono-oxide: It is a poisonous gas that forms when incomplete combustion of organic matters takes place.
When it enters the human respiratory system it has more affinity(200 times) towards haemoglobin and it combines with it and forms a stable compound which leads to suffocation and ultimate death of an organism.
(b) Carbon mono oxide in traces and carbon dioxide: It has been mentioned that carbon mono-oxide(CO) is a poisonous gas so even the traces of it is very harmful to living organisms.
(d) Coal: It is a mixture of carbon and other minerals. It is formed when living organisms(planta and animals) got buried under a rock or volcano where oxygen is not reaching and their oxidation is not possible, due to high pressure and non-availability of oxygen coal is formed.
The formation of coal is a very slow process it takes around 1000-1500 years and coal is a very good fuel.
Therefore, option(C) is correct. i.e., Carbon exists in the atmosphere in the form of carbon dioxide only.
