Which of the following statement is not correct? (WB JEE 2009) (a) ...

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Which of the following statement is not correct?
(WB JEE 2009)
(a) Silicon is extensively used as a semiconductor
\( \mathrm{P} \)
(b) Carborundum is \( \mathrm{SiC} \)
(c) Silicon occurs in free state in nature
W
(d) Mica contains the element silicon
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