$33.$ What is the function of carbon dioxide in the Solvay process?

$-$ a$)$ To react with sodium chloride

$-$ b$)$ To form sodium bicarbonate

$-$ c$)$ To neutralize the solution

$-$ d$)$ To produce chlorine gas

$34.$ Which cell type is considered the most environmentally friendly for caustic soda production?

$-$ a$)$ Mercury cell

$-$ b$)$ Diaphragm cell

$-$ c$)$ Membrane cell

$-$ d$)$ Electrolytic cell