$1.$ 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$)$