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  • Non-metals are usually poor conductors of heat and electricity. They are non-lustrous, non- sonorous, non-malleable and are coloured.(a) Name a lustrous non-metal. (b) Name a non-metal which exists as a liquid at room temperature.

Non-metals are usually poor conductors of heat and electricity. They are non-lustrous, non- sonorous, non-malleable and are coloured.
(a) Name a lustrous non-metal.
(b) Name a non-metal which exists as a liquid at room temperature.
(c) The allotropic form of a non-metal is a good conductor of electricity. Name the allotrope.
(d) Name a non-metal which is known to form the largest number of compounds.
(e) Name a non-metal other than carbon which shows allotropy.
(f) Name a non-metal which is required for combustion.

Answers (1)

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Solution:
(a) Iodine and diamond: They shine as they are lustrous
(b) Bromine: fuming red brown liquid at room temperature
(c) Graphite: Allotrope of carbon (non-metal) good electric conductor
(d) Carbon:  each carbon can combine with four different atoms
(e) Sulphur: Yellow rhombic sulphur and monoclinic sulphur are allotropic form
(f) Oxygen: it is required for combustion.

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