Chemistry
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.
Carbon
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Answer
(a) True
(b) False
Correct statement — Diamond is the purest form of carbon.
(c) False
Correct statement — Colourless and transparent diamonds are costlier than coloured diamonds.
(d) True
(e) True
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Related Questions
Diamond is used for
- making the electrodes of electric furnaces.
- making crucibles for melting metals.
- cutting and drilling rocks and glass.
- making carbon brushes for electric motors.
Carbon forms innumerable compounds because
- it has four electrons in its outermost shell.
- it behaves as a metal as well as a non-metal.
- carbon atoms can form long chains.
- it combines with other elements to form covalent compounds.
Define the following terms:
(a) Allotropy
(b) Carat
(c) Crystal
(d) Catenation
State the terms:
(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.