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Metals

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Question

Name the metal which is non-lustrous.

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Solution

An explanation for Correct answer:-
The lustrous property is due to the presence of free mobile electrons.
Pure Sodium( $Na$ ) is not found as it is a highly reactive metal that catches fire as soon as comes in contact with air.
A non-metal that is lustrous shines.
Therefore, Sodium( $Na$ ) is a metal that is non-lustrous as it does not have any free electrons.

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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.

name a non metal which is lustrous and a metal which is non-lustrous.

Name a non-metal which is lustrous.

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Q. Non-metals are usually poor conductors of heat and electricity. They are non-lustrous; non-sonorous and non-malleable.
(a) Name a lustrous non-metal.
(b) Name a non-metal which exists as a liquid at room temperature.
(c) Name a non-metal is a good conductor of electricity.
(d) Name a non-metal which is known for its hardness.

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