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Graphite is a soft solid lubricant extremely difficult to melt. The reason for this anomalous  behaviour is that graphite

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Important Questions on The p-Block Elements

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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
The P-P-P bond angle in white phosphorus is
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Chemistry>Inorganic Chemistry>The p-Block Elements>Allotropes of Carbon
White phosphorus, when heated with conc. NaOH solution in an inert atmosphere of CO2, forms phosphine and a sodium salt of oxoacid of phosphorus, 'X'. The oxidation state of phosphorus in 'X' is
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Chemistry>Inorganic Chemistry>The p-Block Elements>Allotropes of Carbon
C60, an allotrope of carbon contains
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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
Which among the group -15 elements does NOT exist as tetra atomic molecule?
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Chemistry>Inorganic Chemistry>The p-Block Elements>Allotropes of Carbon
White phosphorous P4 has the following characteristics
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Chemistry>Inorganic Chemistry>The p-Block Elements>Allotropes of Carbon
The number of six membered and five membered rings in Buckminster Fullerence respectively is
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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:

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Chemistry>Inorganic Chemistry>The p-Block Elements>Allotropes of Carbon
White phosphorus on reaction with concentrated NaOH solution in an inert atmosphere of CO2 gives phosphine and compound X.X on acidification with HCl gives compound Y. The basicity of compound Y is:
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Chemistry>Inorganic Chemistry>The p-Block Elements>Allotropes of Carbon
The C-C bond length is maximum in:
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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.
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Chemistry>Inorganic Chemistry>The p-Block Elements>Allotropes of Carbon
The number of pentagons in C60 and trigons (triangles) in white phosphorus, are;
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Chemistry>Inorganic Chemistry>The p-Block Elements>Allotropes of Carbon
The element that does NOT exhibits allotropy is-
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Chemistry>Inorganic Chemistry>The p-Block Elements>Allotropes of Carbon
The INCORRECT statement regarding the structure of C60 is :
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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 element that shows greater ability to form pπ-pπ multiple bonds is:
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Chemistry>Inorganic Chemistry>The p-Block Elements>Allotropes of Carbon
In diamond, the hybridization of each carbon atom is
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Chemistry>Inorganic Chemistry>The p-Block Elements>Allotropes of Carbon
Diamond is extremely hard whereas graphite is soft. This is because
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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.