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Exceptions in Physical Properties

Identify the ...

Question

Identify the true statement from the following

A

All metals have fixed melting points whereas non metals do not

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B

All metals are malleable

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C

The hardest substance known is a non metal

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D

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

The allotrope of carbon, diamond, is the hardest known mineral according to Mohs scale. This hardness is attributed to the strong covalent bonds between the carbon atoms in its tetrahedral lattice structure. Tungsten is a good conductor of electricity but a bad conductor of heat!

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