KCET2017ChemistryCoordination Compounds
The correct statement regarding defect in solids is
Options
- AFrenkel defect is usually favoured by a very small difference in the sizes of cations and anions.
- BFrenkel defect is a dislocation defect.
- CTrapping of proton in the lattice leads to the formation of F-centers
- DSchottky defect has no effect on the physical properties of solids
Correct answer
B. Frenkel defect is a dislocation defect.
Step-by-step solution
Option (1): Frenkel defect occurs in compounds in which (i) coordination number is low (ii) anions are much larger in size than cations. Option (2): Frenkel defect arises when an ion is dislocated from its normal position causing a vacancy or a hole and occupied an interstitial site between the lattice points. Option (3): The electrons trapped in anion vacancies are referred as F-centers so trapping of electrons takes place and not protons. Option (4): Because of presence of large no. of vacancies in crystals in Sc