Identify the true statement from the followingAll metals have fixed melting points whereas non metals do not-All metals are malleable-The hardest substance known is a non-metal-Tungsten is a good conductor of heat and electricity-

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Standard VII

Chemistry

Allotropes

Identify the ...

Question

Identify the true statement from the following

All metals have fixed melting points whereas non metals do not

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All metals are malleable

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The hardest substance known is a non-metal

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Tungsten is a good conductor of heat and electricity.

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Solution

The correct option is C
The hardest substance known is a non-metal

Diamond, a form of carbon, is the hardest known mineral according to Mohs scale and is the hardest substance known.

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Similar questions

Q. Which one of the following is not true of metals:
(a) Metals are good conductors of electricity.
(b) Metals are malleable and ductile.
(c) Metals form non-polar covalent compounds.
(d) Metal will have 1 or 2 or 3 electrons in their valence shell.

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.

Question 43
A non-metal X exists in two different forms Y and Z. Y is the hardest natural substance, whereas Z is a good conductor of electricity. Identify X, Y and Z.

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.

Non-metals are usually poor conductors of heat and electricity. They are non-lustrous, non-sonorous, non-malleable and are colored. Name a non-metal which is known to form the largest number of compounds.

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Identify the true statement from the following

The correct option is C The hardest substance known is a non-metal Diamond, a form of carbon, is the hardest known mineral according to Mohs scale and is the hardest substance known.

The correct option is C
The hardest substance known is a non-metal

Diamond, a form of carbon, is the hardest known mineral according to Mohs scale and is the hardest substance known.