The solid element A exhibits the property of catenation. It is also present in the form of a gas B in the air which is utilised by plants in photosynthesis. An allotrope C of this element is used in glass cutters.
(a) What is element A ?
(b) What is the gas B ?
(c) Name the allotrope C.
(d) State another use of allotrope C (other than in glass cutters).
(e) Name another allotrope of element A which exists as spherical molecules.
(f) Name a yet another allotrope of element A which conducts electricity.
Lakhmir Singh Chemistry Class 10
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Answer:
i) Carbon is the element A as it exhibits the property of catenation. Formation of longer chain by linking atoms of same elements is called catenation.
ii) Carbon when reacts with oxygen forms Carbon dioxide (Gas B) which is used by the green plants to perform photosynthesis.
iii) Diamond (Allotrope C) is an allotrope of the element Carbon used in glass cutters.
iv) Another use of diamond is found in jewellery making.
v) Another allotrope of Carbon which exists in spherical form is Buckminsterfullerene and has a formula of C60.
vi) Another allotrope of carbon which conducts electricity is Graphite.
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2
Answer:
a)carbon
b)carbon dioxide
c)Diamond
d)Jewellery
e)surgical tools
f)graphite
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