Alkali metals readily react with oxyacids forming corresponding salts (like M_(2)CO_(3), MHCO_(3), MNO_(3), M_(2)SO_(4) etc) with evolution of hydrogen. They also dissolve in liquid NH3 but without the evolution of hydrogen. The colour of its dilute solution is blue when it is heated and concentrated, then its colour becomes bronze Among the carbonates of alkali metals which one has highest stability

Alkali metals readily react with oxyacids forming corresponding salts

1.	Alkali metals readily react with oxyacids forming corresponding salts (like M_(2)CO_(3), MHCO_(3), MNO_(3), M_(2)SO_(4) etc) with evolution of hydrogen. They also dissolve in liquid NH3 but without the evolution of hydrogen. The colour of its dilute solution is blue when it is heated and concentrated, then its colour becomes bronze Among the carbonates of alkali metals which one has highest stability
Answer» `Cs_(2)CO_(3)` `Rb_(2)CO_(3)` `K_(2)CO_(3)` `Na_(2)CO_(3)` Solution :In alkali metl carbonaties from top to bottom stability increases due to decreasing of crystal LATTICE ENERGY of their corresponding OXIDES