Tag: the world of carbon

Questions Related to the world of carbon

Which of the following substance consists of only one element?

chemistry the world of carbon organic compounds allotropes of carbon versatile nature of carbon

  1. Diamond

  2. Glass

  3. Marble

  4. Sand

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Correct Option: A
Explanation:

Diamond is the purest form of carbon while glass is composed of silica, sodium carbonate. Marble is calcium carbonate and sand is silicon dioxide.

The allotrope of carbon which is a good conductor of heat and electricity is:

chemistry the world of carbon organic compounds allotropes of carbon versatile nature of carbon

  1. diamond

  2. sugar charcoal

  3. graphite

  4. wood charcoal

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Correct Option: C
Explanation:

Graphite is an allotrope of carbon other than diamond. 


It has planar structure in which three electrons are covalently bonded while the fourth electron is free to migrate in the layered structure and makes graphite electrically conductive.

Hence, option $C$ is correct.

Rhombic and monoclinic sulphur are:

chemistry the world of carbon organic compounds allotropes of carbon versatile nature of carbon

  1. isomers of sulphur

  2. isotopes of sulphur

  3. allotropes of sulphur

  4. isobars of sulphur

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Correct Option: C

The allotrope of carbon used in nuclear reactor is :

chemistry the world of carbon organic compounds allotropes of carbon versatile nature of carbon

  1. graphite

  2. diamond

  3. coke

  4. sugar charcoal

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Correct Option: A
Explanation:

Graphite is the most stable form of carbon under standard conditions. Special grades of synthetic graphite also used as neutron moderator within nuclear reactor. Its low neutron cross-section also recommends its use in proposed fusion reactors.

Some elements show the property of existing in two or more distinct physical form which show different physical properties but same chemical properties. These distinct forms of an element are called :

chemistry the world of carbon organic compounds allotropes of carbon versatile nature of carbon

  1. isomers

  2. allotropes

  3. compounds

  4. isobars

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Correct Option: B
Explanation:

Allotropes of carbon have a different physical form but chemically they are similar, e.g., diamond and graphite are allotropes of carbon which are chemically carbon compounds but physically diamond is the hardest material known while graphite is soft material.


Hence, option $B$ is correct,

An allotropic form of carbon used for cutting and drilling is which of the following?

chemistry the world of carbon organic compounds allotropes of carbon versatile nature of carbon

  1. charcoal

  2. bone charcoal

  3. graphite

  4. diamond

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Correct Option: D
Explanation:

The dominant industrial use of diamond is in cutting, drilling (drill bits), grinding. It is used for these purposes due to its hardness.

The allotrope of carbon used in nuclear reactor is:

chemistry the world of carbon organic compounds allotropes of carbon versatile nature of carbon

  1. diamond

  2. suger charcoal

  3. graphite

  4. wood charcoal

Show answer
Correct Option: C
Explanation:

Graphite is the most stable allotrope of carbon.Contrary to popular belief, high-purity graphite does not readily burn, even at elevated temperatures. For this reason,it is used in nuclear reactor and for high-temperature crucibles for melting metals.


 Hence,graphite is used in nuclear reactor and it is a allotrope of carbon.

Graphite is a ______ conductor of electricity whereas diamond is a ______ conductor of electricity.

chemistry the world of carbon organic compounds allotropes of carbon versatile nature of carbon

  1. bad, bad

  2. good, bad

  3. bad, good

  4. good, good

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Correct Option: B
Explanation:

Carbon has a valency of 4. In graphite, each carbon atoms 3 electrons are strongly bonded to other carbon atoms forming a hexagonal structure while one of the electrons of graphite is loosely bound and can thus conduct electricity. 


In diamond, each carbon atom is attached to four other carbon atoms forming a tetrahedral structure and has no free or loosely bound electrons. Thus diamond cannot conduct electricity.

Hence, option B is correct.

Some elements show the property of existing in two or more distinct physical form which shows different physical properties but same chemical properties. These distinct forms of an element are called:

chemistry the world of carbon organic compounds allotropes of carbon versatile nature of carbon

  1. isomers

  2. allotropes

  3. compounds

  4. isobars

Show answer
Correct Option: B
Explanation:

The term allotrope refers to one or more forms of a chemical element that occur in the physical state. Graphite and diamond are both allotropes of carbon that occur in the solid state. Allotropism only refers to different forms of chemical elements.

Due to the weak Van der Waals' forces and less distance between the layers, graphite :

chemistry the world of carbon organic compounds allotropes of carbon versatile nature of carbon

  1. show lubricating property

  2. has lusture

  3. is hexagonal

  4. is a good conductor of electricity

Show answer
Correct Option: A
Explanation:

Because the layers are only weakly held together they can easily slip over one another, hence, show lubricating property.