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

Which of the following statement is true for graphite?


(a) In graphite, each carbon atom is bonded to four other carbon atoms.
(b) Graphite is very hard.
(c) It is a good conductor of electricity.
(d) It is bad conductor of electricity.

  1. a, b and d

  2. only c

  3. a and d

  4. a and c
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The  statement C is  true for graphite.
(a) In graphite, each carbon atom is bonded to three other carbon atoms.
(b) Graphite is soft.
(c) It is a good conductor of electricity as delocalised electrons are free to move in delocalised molecular orbitals.

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

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

  1. diamond

  2. sugar charcoal

  3. graphite

  4. wood charcoal
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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

The allotrope of carbon used in nuclear reactor is :

  1. graphite

  2. diamond

  3. coke

  4. sugar charcoal
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

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 :

  1. isomers

  2. allotropes

  3. compounds

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