Which of the following statements about silicon carbide (carborundum) and related compounds are correct?

A $SiC$ is made by heating $SiO X_{2}$ with excess coke at about 2000 to 3000 K in an electric furnace.
B $SiC$ has a diamond-like three-dimensional covalent structure and is very hard.
CGlass is made by fusing $SiO X_{2}$ with $Na X_{2} CO X_{3}$ , with evolution of $CO X_{2}$ .
DIn $SiC$ , carbon is in the $+ 4$ oxidation state.

Answer: A, B, C

SiO X_{2} + 3 C SiC + 2 CO

occurs at very high temperature. Each atom in SiC is tetrahedrally bonded, as in diamond, so it is a hard abrasive. Fusing sand with soda ash gives sodium silicate:

SiO X_{2} + Na X_{2} CO X_{3} Na X_{2} SiO X_{3} + CO X_{2}

. Carbon is more electronegative than silicon, so carbon is

- 4

and silicon

+ 4

in SiC. Statements 1, 2 and 3 are correct.

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Which of the following statements about silicon carbide (carborundum) and related compounds are correct?

Answer: A, B, C

More questions on Silicon compounds: silicates, silicones, zeolites