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AP EAMCET202021 Sep 2020Morning ShiftChemistrySolid StateActual

When ( CaCl ₂ ) is added to ( AgCl ) crystal, the defect introduced is

Options

  1. AFrenkel defect only
  2. BSchottky defect only
  3. CNo change
  4. DBoth Frenkel and Schottky defects

Correct answer

B. Schottky defect only

Step-by-step solution

When mixing ( AgCl ) and ( CaCl ₂ ), each added ion of ( Ca ²⁺ ) replaces ( Ag ⁺ )as they have similar radii. Since, the charge of ( Ca ) and ( Ag ) is of +2 and +1 +1 respectively, it leads to the formation of positive vacancies (Schottky defect). It means that one mole of ( CaCl ₂ ) provides one mole of ( Ag ) vacancies in crystal structure. Hence, the correct option is (b).

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