The number of network solids and ionic solids in the list given below is respectively. $$\mathrm{H}_2 \mathrm{O}$$ (ice), $$\mathrm{AlN}, \mathrm{Cu}, \mathrm{CaF}_2$$, diamond, MgO , $$\mathrm{CCl}_4, \mathrm{ZnS}, \mathrm{Ag}, \mathrm{NaCl}, \mathrm{SiO}_2$$

If molten NaCl contains $$\mathrm{SrCl}_2$$ as impurity, crystallisation can generate

Photographic plates are prepared by coating emulsion of which of the following in gelatin?

In the face centered unit cell, the lattice points are present at