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Which of the following statements is cor...

Which of the following statements is correct?

A

Silicon doped with boron is an i-type semiconductor

B

Silicon doped with arsenic is a p-type semicondutor

C

Metals are good conductors of electricity

D

Electrical conductivity of semiconductors decreases with increase temperature

Text Solution

Verified by Experts

The correct Answer is:
( c)
Due to the presence of free electrons, metals possess good electrical conductivity.
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SIA PUBLICATION-CHEMICAL BONDING AND STRUCTURE OF MOLECULES-MCQ
  1. Which one of the following is a correct set?

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  2. The compound in which the number of dit - px bonds are equal to those ...

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  3. Which of the following statements is correct?

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  4. Which of the following is not a tetrahedral molecule?

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  5. Which of the following is a linear molecule ?

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  6. Which of the following is correct?

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  7. Which of the following is not correct regarding the properties of ioni...

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  8. The oxidation state of Xe in XeO(3) and the bond angle in it respectiv...

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  9. If the bond length and dipole moment of a diatomic molecule are 1.25 A...

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  10. Which one of the following molecules contains both ionic and covalent ...

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  11. What is the hybridisation state of the central atom in NH(4)^(+) ion?

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  12. The number of lone pairs of electrons present on Xe in XeF(4) is

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  13. Which of the following statements is true ?

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  14. Which of the following has lowest bond angle?

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  15. Which of the following is the correct pair?

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  16. The molecule having zero dipole moment is

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  17. Which of the following covalent molecules is an exception of octet rul...

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  18. Which one of the following statements is true for ammonium ion ?

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  19. The state of hybridisation of boron in BCl(3) is

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  20. The effect of repulsion between the two lone pair of electrons present...

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