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Thermodynamically the most stable form of carbon is

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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

Choose the correct statement:

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Chemistry>Inorganic Chemistry>The p-Block Elements>Allotropes of Carbon

The INCORRECT statement regarding the structure of

C_{60}

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

HARD

Chemistry>Inorganic Chemistry>The p-Block Elements>Allotropes of Carbon

White phosphorus on reaction with concentrated

N a O H

solution in an inert atmosphere of

C O_{2}

gives phosphine and compound

(X) . (X)

on acidification with

H C l

gives compound

(Y) .

The basicity of compound

(Y)

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

Match list-I with List-II :

List - I	List - II
A. Coke	I. Carbon atoms are ${sp}^{3}$ 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

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

The element that does NOT exhibits allotropy is-

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Chemistry>Inorganic Chemistry>The p-Block Elements>Allotropes of Carbon

The number of pentagons in

C_{60}

and trigons (triangles) in white phosphorus, are;

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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

The

P - P - P

bond angle in white phosphorus is

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Chemistry>Inorganic Chemistry>The p-Block Elements>Allotropes of Carbon

C_{60},

an allotrope of carbon contains

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Chemistry>Inorganic Chemistry>The p-Block Elements>Allotropes of Carbon

White phosphorous

P_{4}

has the following characteristics

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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

(C_{60}) ?

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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

{CO}_{2}

, forms phosphine and a sodium salt of oxoacid of phosphorus,

' X'

. The oxidation state of phosphorus in

' X'

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Chemistry>Inorganic Chemistry>The p-Block Elements>Allotropes of Carbon

The element that does not show catenation is

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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

Identify the correct statements regarding fullerene.

$i .$ It has $60$ vertices.
$ii .$ All the carbon atoms are in the ${sp}^{3}$ 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.

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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

s p^{3}

and

s p^{2}

respectively.

Thermodynamically the most stable form of carbon is

Important Questions on The p-Block Elements

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