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# Formula for the carbide of silicon with its correct property is:(A) $S{i_2}C,$ very hard and used as abrasive(B) $SiC$ , very hard and used as abrasive(C) $S{i_2}C$ , very soft and used as lubricant(D) $SiC$ , very soft and used as lubricant

Last updated date: 15th Mar 2023
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Hint :Carbide is a term used for compounds made up of metals and metalloids by ionic bonds or covalent bonds. In which carbide exists as ${C_2}^{ - 2}$ which is a dianionic form. Hybridization of carbide ions is sp and it has linear shape. It has two carbon atoms with a lone pair on each atom.

Carbides are mainly of four types: Ionic, Covalent, Interstitial, Transition metals carbide. Silicon forms covalent carbide because carbon and silicon have low electronegativity differences. Silicon carbide is generally known as carborundum. Structure $SiC$ exists in many forms with hexagonal crystal structure as the most common.
Thus, option (B) $SiC$ , very hard and used as abrasive is the correct choice.
$SiC$ has a high thermal conductivity, temperature strength is very high along with properties like behaviour as semiconductors and low thermal expansion.