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What is the second hardest material known?(a) Coke(b) Carborundum(c) Graphite(d) DiamondThe question was posed to me in an international level competition.This question is from p-Block Elements in chapter p-Block Elements of Chemistry – Class 11

Answer»

Right choice is (b) Carborundum

The explanation is: Carborundum is the second HARDEST material known and has a FORMULA of silicon carbide that is SiC. It is used as a semiconductor at high-temperature and ALSO in transistor diode RECTIFIERS. Diamond is the first hardest material known.



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