[3 Mark Question Answer]

Question 13 Marks

State the poisonous nature of carbon monoxide?

Answer

Carbon monoxide is highly poisonous gas. If air containing $0.5\%$ carbon monoxide by volume is inhaled, death can result This is because carbon monoxide combines with the haemogloblin present in the blood cells of our body to form a stable compound called carboxyl-haemoglobin. This does not allow to absorb oxygen. Thus depriving our body cells of oxygen. This cause obsruction in respiration and causes death.

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Question 23 Marks

Answer the following question Explain the softness of graphite with reference to its structure.

Answer

In a graphite molecule of each carbon atoms is linked with three neighboring carbon atoms. Thus forming a hexagonal arrangement of atoms. These hexagonal grouping of carbon atoms are arranged as layers or sheets piled one the top of other. The layers are held together by weak forces such that they can slide over one another. That is why graphite is soft.

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Question 33 Marks

Define the Following Term : Catenation

Answer

The large number of organic compounds is due to the ability of carbon atom to form long chains with other carbon atoms through the sharing of electrons. This unique property of carbon is known as catenation.

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Question 43 Marks

State three ways by which carbon dioxide gas is added into the atmosphere.

Answer

$1.$ By planting more trees.
$2.$ By combustion of fuels
$3.$ By decay of dead animals, plants and plants products.

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Question 53 Marks

What steps should be taken to balance carbon dioxide in the atmosphere ?

Answer

As global warming will cause an unbalanced ecological system, serious efforts should be made to balance the percentage of carbon dioxide in the atmosphere. Some of these steps are:
Growing more trees and plants.
Using smokeless sources of energy like solar energy, biogas, etc.
Using filters in the chimneys of factories and power houses.

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Question 63 Marks

Explain the term ‘green house effect’. How can it be both beneficial and harmful for life on earth ?

Answer

Green house effect $—$ The trapping of the earth’s radiated energy by carbon dioxide present in air, so as to keep the earth warm, is called ‘green house effect’.
Green house is beneficial because this principle is applied to grow plants in colder regions.
Carbon dioxide increases the temperature of atmosphere. Due to rise in temperature; ice in the polar regions may melt, causing floods. So it is harmful for life on earth.

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Question 73 Marks

What is a fire extinguisher ? What is the substance used in the modern type of fire extinguishers ? How is it an improvement over the soda acid$-$type and the foam$-$type fire extinguishers ?

Answer

Fire Extinguisher $—$ Fire extinguishers are a device in which carbon dioxide is produced in different forms for use as the extinguishing agent. It is a modem type of fire extinguisher in which liquid carbon dioxide is stored in a steel cylinder under pressure. Soda$-$acid and foam types of extinguisher cannot be used for extinguishing fire as they prepared in water, which conducts electricity and there can be short circuiting, causing another fire.

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Question 83 Marks

Give a reason for the following : An excess of carbon dioxide increases the temperature of the earth.

Answer

Carbon dioxide is a non$-$poisonous gas, but an excess of this gas can cause suffocation. A person may die in an atmosphere of carbon dioxide due to a lack of oxygen.
Carbon dioxide acts as a greenhouse gas, keeping the world temperature stable. However, when the amount of carbon dioxide in the atmosphere increases, the temperature of the Earth rises, resulting in global warming. Therefore, An excess of carbon dioxide increases the temperature of the earth.

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CHEMISTRY [3 Mark Question Answer]

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