A) Metals have fixed melting points whereas non-metals do not.
B) All metals are malleable.
C) The hardest substance known is a non-metal.
D) Tungsten is a bad conductor of heat and electricity.
Correct Answer: C
Solution :
The hardest substance known is diamond. Diamond is an allotrope of carbon i.e., a non-metal.You need to login to perform this action.
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