$1.$ In the Solvay process, $\_($a$)\_$ reacts with carbon dioxide and water to form $\_($b$)\_,$ which then reacts with sodium chloride to produce $\_($c$)\_.$

$-($a: Ammonia, Limestone, Carbon dioxide$)$

$-($b: Ammonium bicarbonate, Sodium bicarbonate, Calcium carbonate$)$

$-($c: Sodium bicarbonate, Calcium carbonate, Ammonium chloride$)$

$2.$ In the electrolysis of brine using a diaphragm cell, $\_($a$)\_$ is produced at the anode, $\_($b$)\_$ is produced at the cathode, and $\_($c$)\_$ remains in solution.

$-($a: Chlorine gas, Hydrogen gas, Sodium hydroxide$)$

$-($b: Hydrogen gas, Sodium chloride, Oxygen gas$)$

$-($c: Sodium hydroxide, Water, Sodium chloride$)$