Tag: carbon and its forms

Questions Related to carbon and its forms

The reaction between carbon and oxygen can be represented as 
$C _{(s)}+O _{2(x)}\rightarrow CO _{2(g)}+heat$
In which of the following type(s), the above reaction can be classified?
I. Combustion reaction
II. Displacement reaction
III. Endothermic reaction
IV. Combination reaction

chemistry occurrence of carbon compounds in nature importance of carbon covalent bonding in carbon compounds carbon and its forms

  1. (I) and (III)

  2. (I), (II) and (IV)

  3. (I) and (IV)

  4. (I) only

Show answer
Correct Option: C
Explanation:

$C _{(s)}+O _{2(g)}\rightarrow CO _{2(g)}+heat$
It is combination and combustion reaction.

In the Earth's crust, Carbon is found in the form of_________.

chemistry occurrence of carbon compounds in nature importance of carbon covalent bonding in carbon compounds carbon and its forms

  1. carbonates

  2. hydrogen carbonates

  3. petroleum

  4. All of the above

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Correct Option: D
Explanation:
Carbon is found in the atmosphere mostly as carbon dioxide. Animal and plant respiration place carbon into the atmosphere.

Carbon exists in the atmosphere in the form of Carbon monoxide in traces and carbon dioxide.

In the earth crust carbon is found in water, rocks, petroleum and as  carbonates. 

Carbon is also present in the form of hydrocarbons which  often use as sources of energy, such as coal, petrol and natural gas.

Which of the following is not an allotrope of carbon?

chemistry occurrence of carbon compounds in nature importance of carbon covalent bonding in carbon compounds carbon and its forms

  1. Graphite

  2. Granite

  3. Diamond

  4. Fullerene

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Correct Option: B
Explanation:

Carbon is capable of forming many allotropes due to its valency. Well-known forms of carbon include diamand, graphite and fullerenes.


Granite is not allotrope of carbon.

Hence option B is correct.

Who has synthesised the organic compound 'urea' for the first time?

chemistry occurrence of carbon compounds in nature importance of carbon covalent bonding in carbon compounds carbon and its forms

  1. Friedrich Wohler

  2. Berzelelius

  3. Kolbe

  4. None of the above

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Correct Option: A
Explanation:

In 1828, the German chemist Friedrich Wöhler obtained urea artificially by treating silver cyanate with ammonium chloride. 


This was the first time an organic compound was artificially synthesized from inorganic starting materials, without the involvement of living organisms.

An element which is an essential constituent of all organic compounds belongs to the_____group. 

chemistry occurrence of carbon compounds in nature importance of carbon covalent bonding in carbon compounds carbon and its forms

  1. 5th

  2. 8th

  3. 14th

  4. 12th

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Correct Option: C
Explanation:

Carbon is an essential element for all organic compound. It belongs to ${ 14 }^{ th }$ group. Its atomic number is $6$. Methane which is one the very famous organic compound consists of Carbon and hydrogen.

Thus all organic compounds contain carbon and hydrogen of which carbon belongs to the group $14$.

Carbon is a versatile element.
chemistry occurrence of carbon compounds in nature importance of carbon covalent bonding in carbon compounds carbon and its forms

  1. True

  2. False

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Correct Option: A
Explanation:

Carbon is a versatile element. Statement is True.
Carbon is a versatile element and is found in many different chemical compounds, including those found in space. Carbon is versatile because it can form single, double, and triple bonds. It can also form chains, branched chains, and rings when connected to other carbon atoms.

Using the given hints, identify the option with correct coal product and its use.
(1)$\;\;$Almost pure form of carbon.

chemistry occurrence of carbon compounds in nature importance of carbon covalent bonding in carbon compounds carbon and its forms

  1. Coke, manufacture of steel

  2. Coal tar, manufacture of paints

  3. Coke, manufacture of plastics

  4. Coal tar, extraction of metals

Show answer
Correct Option: A
Explanation:

Coke has few impurities and high carbon content. Coke is used as a fuel and as reducing agent in smelting iron ore in blast furnace for production of steel. The bulk specific gravity of coke is around 0.77 and is highly porous.