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Diamond is a extremely hard, transparent crystal, with the carbon atoms linked together in a hexagonal lattice. 

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Important Questions on Carbon and its Compounds

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Science>Chemistry>Carbon and its Compounds>Allotropy in carbon
_____ is the hardest substance known.
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Science>Chemistry>Carbon and its Compounds>Allotropy in carbon
Because of its softness _____ is used in pencil lead.
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Science>Chemistry>Carbon and its Compounds>Allotropy in carbon
The purest form of amorphous carbon is _____.
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Science>Chemistry>Carbon and its Compounds>Allotropy in carbon
When a diamond is heated at about 1600 0C in the absence of oxygen, it is _____.
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Science>Chemistry>Carbon and its Compounds>Allotropy in carbon
_____ is the hardest substance that occurs naturally.
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Science>Chemistry>Carbon and its Compounds>Allotropy in carbon
In diamond, each carbon atom is bonded to _____ other carbon atoms. (four/three/two)
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Science>Chemistry>Carbon and its Compounds>Allotropy in carbon
Graphite, coal and fullerene are _____ of carbon.
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Science>Chemistry>Carbon and its Compounds>Allotropy in carbon
The soft crystalline form of carbon is_____.
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Science>Chemistry>Carbon and its Compounds>Allotropy in carbon
The tendency of an element to exist in two or more forms but in the same physical state is called _____.
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Science>Chemistry>Carbon and its Compounds>Allotropy in carbon
Graphite is a _____ form of carbon. (Crystalline/Amorphous)
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Science>Chemistry>Carbon and its Compounds>Allotropy in carbon
Graphite is used as a moderator in _____.
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Science>Chemistry>Carbon and its Compounds>Allotropy in carbon
Black diamonds contain _____ in them.
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Science>Chemistry>Carbon and its Compounds>Allotropy in carbon
The lead of pencil is made by mixing clay with powdered _____. (charcoal/graphite/lead)
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Science>Chemistry>Carbon and its Compounds>Allotropy in carbon
The atoms in a diamond are arranged in a _____ manner.
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Science>Chemistry>Carbon and its Compounds>Allotropy in carbon
The form of carbon which is used as a lubricant at high temperature is _____.(graphite/diamond/fullerene)
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Science>Chemistry>Carbon and its Compounds>Allotropy in carbon
_____ is the hardest allotropic form of carbon.
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Science>Chemistry>Carbon and its Compounds>Allotropy in carbon
The different forms of the same element are known as_____.
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Science>Chemistry>Carbon and its Compounds>Allotropy in carbon
The allotrope of carbon used for cutting glass is_____.
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Science>Chemistry>Carbon and its Compounds>Allotropy in carbon

Diamond has a very _____ melting point. (high/low)

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Science>Chemistry>Carbon and its Compounds>Allotropy in carbon
Diamonds shine because of high _____.