Questions
Match the types of defect given in Column I with the statement given in Column II.
| Column I | Column II | ||
| A. | Impurity defect | 1. | NaCl with anionic sites called F-centers |
| B. | Metal excess defect | 2. | FeO with Fe3+ |
| C. | Metal deficiency defect | 3. | NaCl with Sr2+ and some cationic sites vacant |
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Correct option is D
A. → (3) B. →(1) C. →(2)A. Impurity defect arises due to replacement of one common ion resent in any crystal by another uncommon ion.B .Metal excess defect is due to missing of cation from ideal ionic solid which lead to create a F-center generally occupied by unpaired electrons, e.g. NaCl with anionic site.C. In Feo and Fe3+ exists along with Fe2+ which lead to decrease in metal ion(s) so this is a type of metal deficiency defect.
Similar Questions
Consider the following statements.
I. Impurity defects arise when foreign atoms are present at the lattice site in place of host atoms or at the vacant interstitial sites.
Il. Addition of impurities alters the properties of the crystal.
III. Doping is the process of adding impurities to a crystalline substance so as to change its properties.
Which of the above statement(s) is/are correct?
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