Column-I		Column-II
(a)	Solvay's process used for	(p)	$\mathrm{Nacl}$
(b)	Evolve ${\mathrm{CO}}_2\uparrow$ on heating	(q)	${\mathrm{Na}}_2{\mathrm{O}}_2$
(c)	Aq. solution is neutral towards litmus	(r)	${\mathrm{NaHCO}}_3$
(d)	Oxone	(s)	${\mathrm{Na}}_2{\mathrm{CO}}_3$

 

Sodium carbonate (${\mathrm{Na}}_2{\mathrm{CO}}_3$) and sodium bicarbonate (${\mathrm{NaHCO}}_3$) are produced via the solvay method, often known as the ammonia soda process. To determine if a given substance is acidic, basic, or neutral in nature, use litmus paper as an indicator.

The sodium salt of carbonic acid is sodium carbonate, often known as washing soda or soda ash. It is made by passing carbon dioxide gas through a concentrated sodium hydroxide solution. As sodium bicarbonate is heated further, sodium carbonate, ${\mathrm{co}}_2$, and ${\mathrm{H}}_2\mathrm{O}$ are produced.

Oxone is the brand name for soda bleach, a mixture of ${\mathrm{Na}}_2{\mathrm{O}}_2$ and diluted $\mathrm{HCl}$.