Which of the following does not participate in the Solvay process for the manufacture of $Na_2CO_3$?

Choose the compound of each of the following pairs that has the more solubility in water:
$(a) \, BeSO_4, BaSO_4$
$(b) \, NaCl, MgCl_2$
$(c) \, AgCl, AgI$

Beryllium is placed above magnesium in the second group. Beryllium dust,therefore,when added to $MgCl_2$ solution will:

Describe two important uses of each of the following: $(i)$ caustic soda,$(ii)$ sodium carbonate,$(iii)$ quicklime.

Thermal decomposition of lithium nitrate gives:

Which element from the following is used in photoelectric cells?