Match the following:
Column I Column II
A. Castncr Kell-
(p) $\mathrm{MgCl}_{2}, 5 \mathrm{MgO} \cdot \mathrm{x} 1 \mathrm{1}_{2} \mathrm{O}$
ner cell
B. $\mathrm{J}_{\text {carl ash }}$
(q) $\mathrm{K}_{2} \mathrm{CO}_{3}$
C. Solvay's proccss
(r) Manufacrure of $\mathrm{NaH} \mathrm{CO}_{3}$
D. Sorel's cement
(s) Marlufacture of $\mathrm{NaOH}$