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Standard IX
Chemistry
Graphite
Diamond has a...
Question

Diamond has a _______ structure while that of graphite is ________.


A
hexagonal layered, octahedron
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B
tetrahedral, hexagonal layered
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C
tetrahedral, square pyramidal
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D
pentagonal, hexagonal layered
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Solution

The correct option is B tetrahedral, hexagonal layered
Diamond is a crystalline allotrope of carbon in which each carbon atom is covalently bonded to four other carbon atoms. It forms a rigid 3D tetrahedral structure as shown below.

Graphite is another crystalline allotrope of carbon. In graphite, each carbon atom is covalently bonded to three other carbon atoms, thus forming a hexagonal layered structure. Each of these layers are joined together by weak van der Waals force.


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Q. A Graphite has a layer like structure.
B. The distance between two layers in graphite is 20 pm
C. Each layer is composed of planar hexagonal rings
Which of the above statement (s) is /are true?
Q. A Graphite has a layer like structure.
B. The distance between two layers in graphite is 20 pm
C. Each layer is composed of planar hexagonal rings
Which of the above statement (s) is /are true?
Q.

Write 'true' or 'false' against the following statements :

(a) Carbon constitutes 0.03% of the earth's crust.

(b) Graphite is the purest form of carbon.

(c) Coloured diamonds are costlier than colourless and transparent diamonds.

(d) Graphite has layers of hexagonal carbon bondings.

(e) Diamond is insoluble in all solvents.

Q. Graphite has a _______ layered structure.
Q. In hexagonal system of crystals, a frequently encountered arrangement of atoms is described as a hexagonal prism. Here, the top and bottom of the cell arc regular hexagons and three atoms are sandwiched between them. A space-filling model of this structure, called hexagonal close packed (hcp), is constituted of a sphere on a flat surface surrounded in the same plane by six identical spheres as closely as possible. Three spheres are then placed over the first layer so that they touch each other and represent the second layer. Each one of these three spheres touches three spheres of the bottom layer. Finally, the second layer is covered with a third layer that is identical to the bottom layer in relative position. Assume radius of every sphere to be 'r'.

The volume of this hcp unit cell is:


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