Schottky Defect

Q.

Which of the following compounds is likely to show both Frenkel and Schottky defects in its crystalline form?

1. $\mathrm{ZnS}$

2. $\mathrm{CsCl}$

3. $\mathrm{KBr}$

4. $\mathrm{AgBr}$

Q. The type of defect $NaCl$ crystal can exhibit is:

Q.

What type of stoichiometric defect is shown by: $\mathrm{AgBr}$

Q. Which of the following compounds exhibits Schottky defect?

1. $Ca{F}_2$
2. $ZnS$
3. $AgI$
4. $CsCl$

Q. Which of the following compounds is likely to show both Frenkel and Schottky defects in its crystalline form ?

Q. Which of the following statement regarding crystal defects is /are not correct?

1. Schottky defects are dislocation defects
2. Three cationic vacancies are created per ion of $A{l}^{3+}$ inserted if NaCl crystals are doped with $A{l}^{3+}$ ion
3. Addition of $As$ to $Si$ results in formation of n-type semiconductors
4. Packing fraction remains unaffected in vacancy defect

Q.

Schottky defect generally appears in

[DCE 2004]

1. NaCl

2. KCl

3. CsCl

4. All of these

Q.

Ionic solids, with Schottky defects, contain in their structure

[CBSE PMT 1994]

1. Equal number of cation and anion vacancies
2. Anion vacancies and interstitial anions
3. Cation vacancies only
4. Cation vacancies and interstitial cations

Q.

When can anyone observe the Schottky defect?

Q. Which of the following statement regarding crystal defects is /are not correct?

1. Schottky defects are dislocation defects
2. Three cationic vacancies are created per ion of $A{l}^{3+}$ inserted if NaCl crystals are doped with $A{l}^{3+}$ ion
3. Addition of $As$ to $Si$ results in formation of n-type semiconductors
4. Packing fraction remains unaffected in vacancy defect

Q.

Read the following question and answer as per the direction given below:
Statement 1: In any ionic solid [MX] with Schottky defect, the number of positive and negative ions are same.
Statement 2: An equal number of cation and anion vacancies is present.

1. Statement 1 is true, Statement 2 is true; Statement 2 is a correct explanation of Statement 1.

2. Statement 1 is true; Statement 2 is true; Statement 2 is not a correct explanation of Statement 1.

3. Statement 1 is true; Statement 2 is false.

4. Statement 1 is false; Statement 2 is true.

Q. Which of the following compounds exhibits Schottky defect?

1. $Ca{F}_2$
2. $ZnS$
3. $AgI$
4. $CsCl$

Q.

Read the following question and answer as per the direction given below:
Statement 1: In any ionic solid [MX] with Schottky defect, the number of positive and negative ions are same.
Statement 2: An equal number of cation and anion vacancies is present.

1. Statement 1 is true, Statement 2 is true; Statement 2 is a correct explanation of Statement 1.

2. Statement 1 is true; Statement 2 is true; Statement 2 is not a correct explanation of Statement 1.

3. Statement 1 is true; Statement 2 is false.

4. Statement 1 is false; Statement 2 is true.

Q.

Which defect causes decrease in the density of crystal

[KCET 2000, 05]

1. Frenkel

2. Schottky

3. Interstitial

4. F - centre

Q.

Schottky defect in crystals is observed when

[CBSE PMT 1998; KCET 2002]

1. Density of crystal is increased
2. Unequal number of cations and anions are missing from the lattice
3. An ion leaves its normal site and occupies an interstitial site
4. Equal number of cations and anions are missing from the lattice