Write True or False against the following statements:

(a) Carbon occurs as carbon dioxide in the atmosphere.

(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.

Give an appropriate term for the following:

(a) Substances whose atoms or molecules are arranged in a definite pattern.

(b) Different forms of an element found in the same physical state.

(c) The property by which atoms of an element link together to form long chain or ring compounds.

How many carbon atoms are there in Buckminster fullerenes?

Define the following terms:

(a) Allotropy

(b) Carat

(c) Crystal

(d) Catenation