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CHEMISTRY [2 Mark Question Answer]

Carbon and Its Compounds · ICSE STD 8 (ICSE - English Medium). 19 questions.

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[2 Mark Question Answer]

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19 questions · timed · auto-graded

Question 12 Marks
Write two remedies for carbon monoxide poisoning.
Answer
$1.$ The victim should immediately brought out into the open.
$2.$ The victim should be given artificial respiration with caibogen.
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Question 22 Marks
Explain the reducing action of carbon monoxide.
Answer
Reducing action of carbon $-$ monoxide: Carbon monoxide is a strong reducing agent. It reduces the oxides of the less active metals to their respective metals and itself gets oxidised to carbon dioxide.
$\underset{\text { (black cupric oxide) }}{\mathrm{CuO}}+\mathrm{CO} \xrightarrow{\text { heat }} \mathrm{CU}+\underset{\text { red/brown }}{\mathrm{CO}_2}$
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Question 32 Marks
Give two uses of carbon monoxide.
Answer
Uses of carbon monoxide:
$i.$ Carbon monoxide is a strong reducing agent.
$ii.$ Carbon monoxide is used in the extraction of pure metals from their ores.
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Question 42 Marks
How is carbon monoxide gas formed?
Answer
Mostly carbon monoxide is formed when a large amount of carbon or its compounds is burnt in a limited supply of air or oxygen.
$\underset{\text { (carbon) }}{2 \mathrm{C}}+\underset{\text { (oxygen) }}{\mathrm{O}_2} \xrightarrow{\text { heat }} \underset{\text { (carbon monoxide) }}{2 \mathrm{CO}}$
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Question 52 Marks
Give two uses of diamond.
Answer
Uses of Diamond:
$1.$ Diamond is used in jewellery as a gem
$2.$ It is used for cutting and drilling rocks, glass,
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Question 62 Marks
Give two uses of graphite.
Answer
Uses of graphite:
$1.$ For making the electrodes of electric furnaces.
$2.$ For making crucibles for melting metals due to its high melting points.
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Question 72 Marks
Answer the following question What are fullerenes? Name the most common fullerenes.
Answer
Fullerenes are the third crystalline form of carbonThough they were discovered only recently. They have.been found to exist in interstellar dust as well as in the geological formations of the earth.
Common fullerenes are $C – 32, C – 50, C – 70$ and $C – 76$
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Question 82 Marks
Answer the following question Why is diamond very hard?
Answer
A diamond is a giant molecule. The number of valence electrons in carbon atom is four. As such each carbon atom is linked with four neighboring carbon atoms. Thus forming a rigid tetrahedral structure. It is the strong bonding’that makes diamond the hardest substance.
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Question 92 Marks
Answer the following question Why is graphite a good conductor of electricity but not diamond?
Answer
In a graphite molecule, one valence electron of each carbon atom remains free, Thus making graphite a good conductor of electricity. Whereas in diamond, they have no free mobile electron. Thats why diamond are bad conductor electricity.
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Question 102 Marks
Define the Following Term : Crystal
Answer
A crystal is a homogeneous solid which particles $($atoms, molecules or ions$)$ are arranged in difinite pattern due to which they have definite geometrical shape with plane surfaces e.g. sugar and sodium chloride.
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Question 112 Marks
Give two uses for the following : lampblack state two use of lampblack or soot.
Answer
Uses of lamp black:
It is used in making black shoe polish.
It is used in the manufacture of tyres and gun powder.
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Question 122 Marks
Give two uses for the following : bone charcoal
Answer
Bone charcoal:
It is extensively used to decolourise cane-sugar in the process of manufacturing sugar.
It is also used in the manufacture of large number of phosphorous compounds.
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Question 132 Marks
Give two uses for the following : sugar charcoal
Answer
Sugar charcoal:
Sugar charcoal is mostly used as a reducing agent.
It is used to decolourise coloured solutions.
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Question 142 Marks
Give two uses for the following : wood charcoal
Answer
Uses of wood charcoal:
Wood charcoal is used as a fuel.
It is an important constituent of gun powder.
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Question 152 Marks
Give two uses for  the following : coke  Write two important uses of coke. state two uses of coke.
Answer
Uses of coke
$i.$ Coke is mainly used as a reducing agent in the extraction of metals $($like iron, zinc, etc$)$.
$ii.$ Coke is used as a smokeless fuel, in smelting furnaces.
$iii.$ It is used in the manufacturing of water and producer gas.
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Question 162 Marks
Give two uses for the following : coal  State two uses of coal. What are the uses of coal?
Answer
Uses of coal
$1.$ Coal is used as fuel in factories and homes.
$2.$ Coal is used to obtain coke, coal gas and coal tar.
$3.$ Coal is used in thermal power plants for the generation of electricity.
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Question 172 Marks
Descirbe the formation of coal
Answer
The formation of coal took millions of years. Coal was formed by the bacterial decomposition of ancient vegetable matter hurried under successive layers of the earth. Under in action of high temperature and pressure, and in the abcence of air, the decayed vegetable matter converted into coal.
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Question 182 Marks
Why is sulphuric acid not used for the preparation of carbon dioxide in the laboratory
Answer
Dilute sulphuric acid reacts with calcium carbonate. But it is not used because the calcium sulphate which is formed during the reaction is insoluble in water. It covers the marble chips and stops the reaction.
$\underset{\text { (calcium carbonate) }}{\mathrm{CaCO}_3}+\underset{\text { (sulphuric acid) }}{\mathrm{H}_2 \mathrm{SO}_4(\text { dil })} \longrightarrow \underset{\text { (calcium sulphate) }}{\mathrm{CaSO}_4}+\underset{\text { (water) }}{\mathrm{H}_2 \mathrm{O}}+\underset{\text { (carbon dioxide) }}{\mathrm{CO}_2}$
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Question 192 Marks
Draw a labelled diagram for the preparation of $\ce{CO_2}$ in the laboratory.
Answer
Laboratory preparation of carbon dioxide

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[2 Mark Question Answer] - CHEMISTRY STD 8 Questions - Vidyadip