$14.$ Which cell type uses a cation exchange membrane to separate the anode and cathode compartments?

$-$ a$)$ Mercury cell

$-$ b$)$ Diaphragm cell

$-$ c$)$ Membrane cell

$-$ d$)$ None of the above

$15.$ In brine electrolysis, what is the primary product formed at the cathode?

$-$ a$)$ Chlorine gas

$-$ b$)$ Hydrogen gas

$-$ c$)$ Sodium hydroxide

$-$ d$)$ Sodium chloride