Chemistry
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.
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
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.
Fill in the blanks:
(a) …………… is present in both living and non-living things.
(b) The property of an element to exist in two or more forms but in the same physical state is called …………… .
(c) …………… and …………… are the two major crystalline allotropes of carbon.
(d) …………… is the hardest substance that occurs naturally.
(e) The name 'carbon' is derived from the Latin word …………… .
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.
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.