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AP EAMCET201923 Apr 2019Morning ShiftChemistryp Block Elements (Group 13 & 14)Actual

Which of the following statements are not correct? (A) Diode is a combination of (n )-type and p-type semiconductors. (B) Silicon or germanium is electron rich impurity. (C) Phosphorus and arsenic are electron deficient impurities. (D) Schottky defect decreases the density of the crystal.

Options

  1. AB, C
  2. BA, D
  3. CC, D
  4. DA, C

Correct answer

A. B, C

Step-by-step solution

Among the given statements, (B) and (C) are incorrect. Their correct explanations are as follows: (B) Silicon or germanium belong to group 14, so they can be used as semiconductors. (C) Phosphorus and arsenic belong to group 15, so they have 5 valence electrons. Out of 5 electrons, 4 are used in covalent bonding with Si. The 5th electron is extra and hence become delocalised. Thus, they are electron rich impurities.

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