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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. diamond

  2. suger charcoal

  3. graphite

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

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

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

  1. bad, bad

  2. good, bad

  3. bad, good

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

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 shows 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

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.

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

(i) It is used in making leads of pencils.
(ii) It is used as dry lubricant.
(iii) It is used in making black paint and printers ink.
(iv) It is used in nuclear reactors as moderator.


Which is this substance?

  1. Diamond

  2. Buckminister fullerene

  3. Lampblack

  4. Graphite
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The substance with the following applications is graphite. It is an allotrope of carbon.
(i) It is used in making leads of pencils.
(ii) It is used as a dry lubricant.
(iii) It is used in making black paint and printers ink.
(iv) It is used in nuclear reactors as a moderator.

Graphite is also used in making electrodes and carbon arcs and in the refractory crucible.

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

Which of the following can conduct electricity in the solid state ?

  1. Sucrose, $C _{12}H _{22}O _{11}$(s)

  2. Graphite, C(s)

  3. Sodium hydroxide, NaOH(s)
  4. Iron(III) chloride, $FeCl^3$(s)
  5. Iodine, $I _2$(s)
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Graphite, C(s) can conduct electricity in the solid state.
Ferric chloride and sodium hydroxide are ionic solids which do not conduct electricity in solid state.
They conduct electricity in molten state or in aqueous solution.
Iodine and sucrose are molecular solids which do not conduct electricity.
Graphite is a network solid and conducts electricity as it has delocalised molecular orbitals in which delocalised electrons are free to move.

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

In which of the given pairs the two compounds are allotropes of the same element?

  1. $Br _{2}$ and $Hg$
  2. $Cl _{2}$ and $F _{2}$
  3. $NH _{4}^{+}$ and $H _{3}O^{+}$
  4. $Fe$ and $CO$

  5. Diamond and graphite
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Diamond and graphite are allotropes of each other.
They are are allotropes of carbon. Allotropes are different forms of same element. Another allotrope of carbon is fullerene.