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Exceptions in Physical Properties

Name two non-...

Question

Name two non-metals which are lustrous.

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Solution

Lustre :-
It is the chemical property of the substances which are shiny in the appearance and reflect light evenly.
Those substances which shine in the presence of light and show this lustre property are lustrous in nature.
Generally metals show lustre, and non metals do not.
But non-metals have exception that are Iodine and Carbon
Therefore, The two non-metals which are lustrous in nature are Iodine and Carbon (two allotropes:- Diamond and Graphite)

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Q. 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.
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(e) Name a non-metal other than carbon which shows allotropy.
(f) Name a non-metal which is required for combustion.

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