Tag: versatile nature of carbon

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

Diamond and graphite are the covalent compounds of carbon element (C).

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
The giant molecular structure of carbon is lattices made up of carbon which are covalently bonded. These bonds are very strong due to which they are hard and have high melting points. 

Diamond is an allotrope of carbon in which the carbon atoms are arranged in cubic lattice or diamond lattice. In diamond, each carbon atom has four neighbors joined to it with covalent bonds. 

In graphite, the carbon atoms are arranged hexagonally in a planar condensed ring system. The layers are stacked parallel to each other.  The atoms within the rings are bonded covalently, whilst the layers are loosely bonded together by van der Waals forces. 

Therefore, Diamond and graphite are the covalent compounds of carbon element (C).
Multiple choice chemistry the world of carbon organic compounds allotropes of carbon versatile nature of carbon

$C _{graphite}+O _{2(g)}\rightarrow CO _{2(g)}; \Delta H=-393.5kJ, \Delta H$ of the reaction cannot be:

  1. Heat of formation of $CO _{2}$
  2. Heat of combustion of $CO _{2}$

  3. Heat of reaction

  4. Heat of transition
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

$C(graphite)+O _2(g)\longrightarrow CO _2(g)$


Now, here $\Delta H$ of the reaction cannot be the heat of transition, because there is no transition between phase take place at constant temperature and pressure.

For example: transition of $C _{diamond}\to C _{graphite}$

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

Which of the following statements are incorrect?


I.  Diamond is the hardest natural substance known and has very high melting and boiling point. 

II. Iodine is a metal like lithium, sodium, and potassium are so hard that they cannot be cut with a knife. They have high densities and high melting point. 

III. Graphite is a metal.


IV. Most of the non- metals produce acidic oxides while most of the metals produce basic oxides.

V. Graphite is a conductor of electricity.

  1. I, IV and V only

  2. I, III, IV and V only

  3. II and III only

  4. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Statement II is incorrect because iodine is a non-metal and alkali metals (Li, Na, K) are soft enough to be cut with a knife. Statement III is incorrect because graphite is a non-metal (allotrope of carbon).

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

The property of catenation is strongest in carbon because?

  1. Its ionisation potential is low

  2. Its electronegativity is low

  3. The C-C bond energy is high

  4. Its atomic radius is small
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Carbon shows the property of catenation as it is small in size and has the ability to form stable covalent bonds with other carbon atoms to form a chain-like structure. The bond energy between the C-C bond is very high which enables them to form a long chain of C-C stable bonds.

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

What are the two properties of carbon which led to the huge number of carbon compounds we see around us?

  1. (i) Catenation (ii) Tetravalency

  2. (i) Catenation (ii) Tri valency

  3. (i) Catenation (ii) Penta valency

  4. (i) Co valency (ii) Di valency
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Carbon can form huge number of carbon compounds due to following properties: 

Catenation is  a self linkage property, present in carbon. Because of catenation, carbon can form long chains, branched chains and closed chains.

Tetravalence: It is the state of an atom with four electrons available for covalent chemical bonding in its valence 

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

Buckminsterfullerene is an allotropic form of:

  1. phosphorus

  2. sulphur

  3. carbon

  4. tin
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Carbon is capable of forming many allotropes due to its valency.  
Sixty carbon atoms form the shape of a ball like a football with a carbon atom at each corner of the 20 hexagons and 12 pentagons. The buckminsterfullerenes, is also called fullerenes, Fullerenes are molecules of varying sizes composed entirely of carbon, which take the form of a hollow sphere, ellipsoid, or tube.
Option "C" is correct.

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

In diamond, the bonding between carbon atoms is :

  1. co-ordinate

  2. ionic

  3. electrostatic

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

In diamond, each carbon atom is covalently bonded to four other carbon atoms. A lot of energy is needed to separate the atoms in diamond. 


This is because covalent bonds are strong and diamond contains many covalent bonds. 

Hence, the correct option is $D$

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

Diamond is not a good conductor of electricity because :

  1. it is very hard

  2. it is structure is very compact

  3. it is not water soluble

  4. it has no free electrons to conduct electric current
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In diamond, each carbon atom is covalently bonded to four other carbon atoms, leaving no free electrons available to conduct electricity.

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

Which is/are the characteristic(s) of Diamond?

  1. Opaque

  2. Hardness
  3. Both $A$ and $B$

  4. Conductor of electricity
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Diamond is transparent, hard and poor conductor of electricity. In-fact, diamond is hardest known substance on earth. The hardness is due to the presence of strong covalent bonds between C atoms. Hence, the option (B) is the correct answer.