EASY
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A: Hybridization of carbon is sp2 in all its crystalline allotropes.

R: There are alternate double-single bonds in each allotrope of carbon.

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Important Questions on The p-Block Elements

EASY
Chemistry>Inorganic Chemistry>The p-Block Elements>Allotropes of Carbon
Assertion: Among the carbon allotropes, diamond is an insulator, whereas, graphite is a good conductor of electricity.

Reason: Hybridization of carbon in diamond and graphite are sp3 and sp2 respectively.
EASY
Chemistry>Inorganic Chemistry>The p-Block Elements>Allotropes of Carbon
The number of six membered and five membered rings in Buckminster Fullerence respectively is
MEDIUM
Chemistry>Inorganic Chemistry>The p-Block Elements>Allotropes of Carbon
Choose the correct statement:
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Chemistry>Inorganic Chemistry>The p-Block Elements>Allotropes of Carbon
The correct order of catenation is:
EASY
Chemistry>Inorganic Chemistry>The p-Block Elements>Allotropes of Carbon
In diamond, the hybridization of each carbon atom is
EASY
Chemistry>Inorganic Chemistry>The p-Block Elements>Allotropes of Carbon

Match list-I with List-II :

List - I List - II
A. Coke I. Carbon atoms are sp3 hybridised
B. Diamond II. Used as dry lubricants
C. Fullerene III. Used as a reducing agent
D. Graphite IV. Cage like molecules

Choose the correct answer from the options given below:

MEDIUM
Chemistry>Inorganic Chemistry>The p-Block Elements>Allotropes of Carbon
Diamond is extremely hard whereas graphite is soft. This is because
EASY
Chemistry>Inorganic Chemistry>The p-Block Elements>Allotropes of Carbon
The element that shows greater ability to form pπ-pπ multiple bonds is:
EASY
Chemistry>Inorganic Chemistry>The p-Block Elements>Allotropes of Carbon
What is the hybridization of carbon atoms in fullerene?
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Chemistry>Inorganic Chemistry>The p-Block Elements>Allotropes of Carbon

Identify the correct statements regarding fullerene.

i. It has 60 vertices.
ii. All the carbon atoms are in the sp3 hybridisation.
iii.The number of rings having six carbons each is 20 and the number of rings having five carbons each is 12.
iv.  All the C-C bond lengths in it are equal.

MEDIUM
Chemistry>Inorganic Chemistry>The p-Block Elements>Allotropes of Carbon
An allotrope of carbon which exhibits only two types of C-C bond distance of 143.5 pm and 138.3 pm, is
EASY
Chemistry>Inorganic Chemistry>The p-Block Elements>Allotropes of Carbon
The C-C bond length is maximum in:
MEDIUM
Chemistry>Inorganic Chemistry>The p-Block Elements>Allotropes of Carbon
Which of the following statements are correct?
a) The isotope of carbon containing 7 neutrons has natural abundance of 1.1%
b) Among the IV A group elements, Sn has the lowest melting point
c) Silicon is the 2nd (by mass) most abundant element in the earth's crust
d) Elemental carbon shows the highest electrical resistivity among the 14 group elements
EASY
Chemistry>Inorganic Chemistry>The p-Block Elements>Allotropes of Carbon
How many five-membered and six-membered rings are present in a buckmisterfullerene C60?
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Chemistry>Inorganic Chemistry>The p-Block Elements>Allotropes of Carbon
The correct order of bond enthalpy (kJ mol–1) is:
MEDIUM
Chemistry>Inorganic Chemistry>The p-Block Elements>Allotropes of Carbon
The INCORRECT statement regarding the structure of C60 is :
MEDIUM
Chemistry>Inorganic Chemistry>The p-Block Elements>Allotropes of Carbon
The number of pentagons in C60 and trigons (triangles) in white phosphorus, are;
EASY
Chemistry>Inorganic Chemistry>The p-Block Elements>Allotropes of Carbon
C60, an allotrope of carbon contains
HARD
Chemistry>Inorganic Chemistry>The p-Block Elements>Allotropes of Carbon
Which of the following is the correct order of stability of allotropes of carbon ?
EASY
Chemistry>Inorganic Chemistry>The p-Block Elements>Allotropes of Carbon
Thermodynamically, in which form, carbon is the most stable?