Pick out the wrong statement.

Question

Options:

A . Sand & coke is the main raw material for the manufacture of silicon carbide

B . Carbon refractories can not be used in the furnaces operating under reducing conditions

C . Mullite can be obtained by the heating of alusite, kyanite or silimanite

D . Silica occurs in nature in all cellular, amorphous or crystalline form

Answer: Option B

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