Schottky defect defines imperfection in the lattice structure of a

Which of the following defects is observed in steel?

Which relationship is correct regarding the coordination number and the size of cations and anions in ionic compounds exhibiting Schottky defect?

Why does table salt,$NaCl$,sometimes appear yellow in colour?

If $AgCl$ is doped with $1 \times 10^{-4}$ mole percent of $CdCl_2$,the number of cation vacancies (in $mol^{-1}$) is

Which of the following is not a function of an impurity present in a crystal?