Impurity Defect

Q. When $NaCl$ is doped with ${10}^{-5}$ moles % of $SrC{l}_2$, what is the number of cationic vacancies per mole?

1. ${10}^{-5}\times N_A$
2. ${10}^{-7}\times N_A$
3. $2\times {10}^{-7}{N}_A$
4. None of these

Q.

When $NaCl$ is doped with $1.0\times {10}^{-3}$ mole of $SrC{l}_2$, the number of cation vacancy is ?

1. $6.023\times {10}^{18}$

2. $6.023\times {10}^{20}$

3. $2\times 6.023\times {10}^{20}$

4. $3.011\times {10}^{20}$

Q. Which of the following statements is incorrect regarding the defects in solids?

1. Doping in crystal introduces dislocation defect
2. $AgBr$ crystal shows both Schottky and Frenkel defect
3. Metal excess defect can occur with extra cation present in the interstitial voids
4. Solids containing F-centers are paramagnetic
   

Q. If NaCl is doped with ${10}^{-3}mol$% $SrC{l}_2$, then the concentration of cation vacancies will be

1. $1\times {10}^{-3}mol$%
2. $2\times {10}^{-3}mol$%
3. $3\times {10}^{-3}mol$%
4. $4\times {10}^{-3}mol$%

Q.

Which of the following diagrams is of impurity defect?

1. 

2. 

3. 

4.