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Which of the following statements is not...

Which of the following statements is not correct?

A

Silicon is extensively used as a semiconductor

B

Carborundum is SiC

C

Silcon occurs in free state in nature

D

Mica constains the elements silicon

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WB JEE PREVIOUS YEAR PAPER-QUESTION PAPER 2009-Multiple Choice Questions (Chemistry)
  1. Of the following acids the one which has the capability to form comple...

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  2. Atoms in a P(4) molecule of white phosphorus are arranged regularly in...

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  3. Which of the following statements is not correct?

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  4. In aluminium extraction by the Bayer process, alumina is extracted fro...

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  5. The addition of HBr to 2-pentene gives

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  6. Elthelene can be separated from acetylene by passing the mixture throu...

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  7. Reaction of R OH with R'MgX produces

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  8. In the compound HC -= C- overset(overset(CH(3))(|))(C )=CH(2) the hybr...

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  9. The two structures written below represent

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  10. Which of the following carbocations will be most stable?

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  11. Which statement is incorrect?

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  12. In which of the following reactions new carbon-carbon bond is not form...

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  13. A compound is formed by substitution of two chlorine for two hydrogens...

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  14. Which one of the following is called a carbylamine/

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  15. For making distinction between 2-pentanone and 3-pentanone the reagent...

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  16. Which one of the following formulae does not represent an organic comp...

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  17. The catalyst used for olefin polymerization is

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  18. The oxidant which is used as an antiseptic is

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  19. Which of the following contributes to the double helical structure of ...

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  20. The monomer used to produce orlon is

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