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Exceptions in Physical Properties

Non metals ar...

Question

Non metals are usually poor conductors of heat and electricity. They are non-lustrous, non-sonorous, non-malleable and are coloured.

Which of the following is/are lustrous non-metals?

A

Iodine

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B

Graphite

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C

Selenium

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D

Sulphur

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Solution

The correct options are
A Iodine
B Graphite
Iodine, graphite, diamond, etc. are lustrous but are non-metallic elements.
Options A and B are correct.

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Q. Question 30
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.

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