Assertion :In any ionic solid [MX] with Schottky defects, the number of positive and negative ions are the same. Reason: Equal number of cation and anion vacancies are present.
Assertion :In any ionic solid [MX] with Schottky defects, the number of positive and negative ions are the same. Reason: Equal number of cation and anion vacancies are present.
The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Schottky defect is the defect which is produced when one cation and anion are missing from their respective positions leaving behind a pair of holes. The crystal as a whole remains neutral because the number of missing positive ions (cations) and negative ions (anions) is the same. Schottky defect appears generally in ionic compounds in which radius ratio is not far below unity. For this defect, the cations and anion should not differ much in size. For schottky defect, co-ordination numbers of the ions should be high.
Examples of ionic solids showing this defect are NaCl,CsCl,KCI,KBr etc.
Schottky defect is the defect which is produced when one cation and anion are missing from their respective positions leaving behind a pair of holes. The crystal as a whole remains neutral because the number of missing positive ions (cations) and negative ions (anions) is the same. Schottky defect appears generally in ionic compounds in which radius ratio is not far below unity. For this defect, the cations and anion should not differ much in size. For schottky defect, co-ordination numbers of the ions should be high.
Examples of ionic solids showing this defect are NaCl,CsCl,KCI,KBr etc.
