Name the following :

(a) The hardest naturally occurring substance.

(b) A greyish black non-metal that is a good conductor of electricity.

(c) The third crystalline form of carbon.

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Solution

(a) The hardest naturally occurring substance. – Diamond.
(b) A greyish black non- metal that is a good conductor of electricity. – Graphite.
(c) The third crystalline form of carbon. – Fullerenes.

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(a) Name a lustrous non-metal.
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Name the following : (a) The hardest naturally occurring substance. (b) A greyish black non-metal that is a good conductor of electricity. (c) The third crystalline form of carbon.

(a) The hardest naturally occurring substance. – Diamond. (b) A greyish black non- metal that is a good conductor of electricity. – Graphite. (c) The third crystalline form of carbon. – Fullerenes.

Name the following :

(a) The hardest naturally occurring substance.

(b) A greyish black non-metal that is a good conductor of electricity.

(c) The third crystalline form of carbon.

(a) The hardest naturally occurring substance. – Diamond.
(b) A greyish black non- metal that is a good conductor of electricity. – Graphite.
(c) The third crystalline form of carbon. – Fullerenes.