Schottky defect and Frenkel defect are ....... .

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

Analysis shows that nickel oxide has the formula $Ni_{0.98}O_{1.00}$. The fractions of $Ni^{2+}$ and $Ni^{3+}$ ions in the crystal are ......

The color of metal ions in flame is due to which of the following?

$NaCl$ is heated in an atmosphere of sodium vapour. The resultant yellow colour is due to the formation of

Explain the following term with a suitable example:
$(iv)$ $F$-centres