Tag: carbon and its forms

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Multiple choice chemistry occurrence of carbon compounds in nature importance of carbon covalent bonding in carbon compounds 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

  1. (I) and (III)

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

  3. (I) and (IV)

  4. (I) only
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

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

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

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

  1. carbonates

  2. hydrogen carbonates

  3. petroleum

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
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.
Multiple choice chemistry occurrence of carbon compounds in nature importance of carbon covalent bonding in carbon compounds carbon and its forms

Which of the following is not an allotrope of carbon?

  1. Graphite

  2. Granite

  3. Diamond

  4. Fullerene
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

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

  1. Friedrich Wohler

  2. Berzelelius

  3. Kolbe

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

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

  1. 5th

  2. 8th

  3. 14th

  4. 12th
Reveal answer Fill a bubble to check yourself
C Correct answer
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 $14$.

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

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

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

  1. Coke, manufacture of steel

  2. Coal tar, manufacture of paints

  3. Coke, manufacture of plastics

  4. Coal tar, extraction of metals
Reveal answer Fill a bubble to check yourself
A Correct answer
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.