318841
Schottky defect in a crystal is observed when
1 unequal number of cations and anions are missing from the lattice
2 equal number of cations and anions are missing from the lattice
3 an ion leaves its normal site and occupies an interstitial site
4 no ion is missing from its lattice site
Explanation:
Conceptual Questions
KCET - 2016
CHXII01:THE SOLID STATE
318842
In \(\mathrm{AgBr}\) crystal, the ion size lies in the order \(\mathrm{Ag}^{+}<<\mathrm{Br}^{-}\). The \(\mathrm{AgBr}\) crystal should have the following characteristics
1 Defectless (perfect) crystal
2 Schottky defect only
3 Frenkel defect only
4 Both Schottky and Frenkel defects
Explanation:
AgBr exhibits Frenkel defect due to large difference in the size of \(\mathrm{Ag}^{+}\)and \(\mathrm{Br}\) ions.
CHXII01:THE SOLID STATE
318843
Which type of defect present in \(\mathrm{NaCl}\) ?
1 Frenkel defect
2 Schottky defect
3 F-centre defect
4 None of these
Explanation:
Schottky defect is a vacancy defect in ionic solids. It is shown by those ionic substances in which the cations and anions are of almost similar sizes.Schottky defect is present in sodium chloride \((\mathrm{NaCl})\). This defect arises when equal number of cations and anions are missing from their lattice sites such that electrical neutrality is maintained. \(e.g.\) \(\mathrm{CsCl}, \mathrm{NaCl}, \mathrm{KCl}, \mathrm{AgBr}\), etc.
CHXII01:THE SOLID STATE
318844
Assertion : (A) In any ionic solid (MX) with Schottky defect, the number of positive and negative ions are same. Reason : (R) Unequal numbers of cation and anion vacancies are present.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
In any ionic solid \({\text{(MX)}}\) with Schottky defect, equal number of positive and negative ions are missing from their normal lattice sites and, thus equal number of cations and anion vacancies are present. Hence assertion is correct but reason is incorrect.
318841
Schottky defect in a crystal is observed when
1 unequal number of cations and anions are missing from the lattice
2 equal number of cations and anions are missing from the lattice
3 an ion leaves its normal site and occupies an interstitial site
4 no ion is missing from its lattice site
Explanation:
Conceptual Questions
KCET - 2016
CHXII01:THE SOLID STATE
318842
In \(\mathrm{AgBr}\) crystal, the ion size lies in the order \(\mathrm{Ag}^{+}<<\mathrm{Br}^{-}\). The \(\mathrm{AgBr}\) crystal should have the following characteristics
1 Defectless (perfect) crystal
2 Schottky defect only
3 Frenkel defect only
4 Both Schottky and Frenkel defects
Explanation:
AgBr exhibits Frenkel defect due to large difference in the size of \(\mathrm{Ag}^{+}\)and \(\mathrm{Br}\) ions.
CHXII01:THE SOLID STATE
318843
Which type of defect present in \(\mathrm{NaCl}\) ?
1 Frenkel defect
2 Schottky defect
3 F-centre defect
4 None of these
Explanation:
Schottky defect is a vacancy defect in ionic solids. It is shown by those ionic substances in which the cations and anions are of almost similar sizes.Schottky defect is present in sodium chloride \((\mathrm{NaCl})\). This defect arises when equal number of cations and anions are missing from their lattice sites such that electrical neutrality is maintained. \(e.g.\) \(\mathrm{CsCl}, \mathrm{NaCl}, \mathrm{KCl}, \mathrm{AgBr}\), etc.
CHXII01:THE SOLID STATE
318844
Assertion : (A) In any ionic solid (MX) with Schottky defect, the number of positive and negative ions are same. Reason : (R) Unequal numbers of cation and anion vacancies are present.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
In any ionic solid \({\text{(MX)}}\) with Schottky defect, equal number of positive and negative ions are missing from their normal lattice sites and, thus equal number of cations and anion vacancies are present. Hence assertion is correct but reason is incorrect.
318841
Schottky defect in a crystal is observed when
1 unequal number of cations and anions are missing from the lattice
2 equal number of cations and anions are missing from the lattice
3 an ion leaves its normal site and occupies an interstitial site
4 no ion is missing from its lattice site
Explanation:
Conceptual Questions
KCET - 2016
CHXII01:THE SOLID STATE
318842
In \(\mathrm{AgBr}\) crystal, the ion size lies in the order \(\mathrm{Ag}^{+}<<\mathrm{Br}^{-}\). The \(\mathrm{AgBr}\) crystal should have the following characteristics
1 Defectless (perfect) crystal
2 Schottky defect only
3 Frenkel defect only
4 Both Schottky and Frenkel defects
Explanation:
AgBr exhibits Frenkel defect due to large difference in the size of \(\mathrm{Ag}^{+}\)and \(\mathrm{Br}\) ions.
CHXII01:THE SOLID STATE
318843
Which type of defect present in \(\mathrm{NaCl}\) ?
1 Frenkel defect
2 Schottky defect
3 F-centre defect
4 None of these
Explanation:
Schottky defect is a vacancy defect in ionic solids. It is shown by those ionic substances in which the cations and anions are of almost similar sizes.Schottky defect is present in sodium chloride \((\mathrm{NaCl})\). This defect arises when equal number of cations and anions are missing from their lattice sites such that electrical neutrality is maintained. \(e.g.\) \(\mathrm{CsCl}, \mathrm{NaCl}, \mathrm{KCl}, \mathrm{AgBr}\), etc.
CHXII01:THE SOLID STATE
318844
Assertion : (A) In any ionic solid (MX) with Schottky defect, the number of positive and negative ions are same. Reason : (R) Unequal numbers of cation and anion vacancies are present.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
In any ionic solid \({\text{(MX)}}\) with Schottky defect, equal number of positive and negative ions are missing from their normal lattice sites and, thus equal number of cations and anion vacancies are present. Hence assertion is correct but reason is incorrect.
318841
Schottky defect in a crystal is observed when
1 unequal number of cations and anions are missing from the lattice
2 equal number of cations and anions are missing from the lattice
3 an ion leaves its normal site and occupies an interstitial site
4 no ion is missing from its lattice site
Explanation:
Conceptual Questions
KCET - 2016
CHXII01:THE SOLID STATE
318842
In \(\mathrm{AgBr}\) crystal, the ion size lies in the order \(\mathrm{Ag}^{+}<<\mathrm{Br}^{-}\). The \(\mathrm{AgBr}\) crystal should have the following characteristics
1 Defectless (perfect) crystal
2 Schottky defect only
3 Frenkel defect only
4 Both Schottky and Frenkel defects
Explanation:
AgBr exhibits Frenkel defect due to large difference in the size of \(\mathrm{Ag}^{+}\)and \(\mathrm{Br}\) ions.
CHXII01:THE SOLID STATE
318843
Which type of defect present in \(\mathrm{NaCl}\) ?
1 Frenkel defect
2 Schottky defect
3 F-centre defect
4 None of these
Explanation:
Schottky defect is a vacancy defect in ionic solids. It is shown by those ionic substances in which the cations and anions are of almost similar sizes.Schottky defect is present in sodium chloride \((\mathrm{NaCl})\). This defect arises when equal number of cations and anions are missing from their lattice sites such that electrical neutrality is maintained. \(e.g.\) \(\mathrm{CsCl}, \mathrm{NaCl}, \mathrm{KCl}, \mathrm{AgBr}\), etc.
CHXII01:THE SOLID STATE
318844
Assertion : (A) In any ionic solid (MX) with Schottky defect, the number of positive and negative ions are same. Reason : (R) Unequal numbers of cation and anion vacancies are present.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
Explanation:
In any ionic solid \({\text{(MX)}}\) with Schottky defect, equal number of positive and negative ions are missing from their normal lattice sites and, thus equal number of cations and anion vacancies are present. Hence assertion is correct but reason is incorrect.
