Name two carbonates salts which do not produce carbon dioxide on heating.

• Carbonates: Carbonates are compounds which are having ${\mathrm{CO}}_3^{-}$ as one ion.
• Carbonates like Calcium carbonate (CaCO₃) upon heating result in the production of Carbon dioxide (CO₂)and Calcium oxide(CaO)
• ${\mathrm{CaCO}}_3\left(\mathrm{s}\right)\stackrel{\mathrm{heat}}{\to }\mathrm{CaO}\left(\mathrm{s}\right)+{\mathrm{CO}}_2\left(\mathrm{g}\right)$
• It is a type of decomposition reaction.
• Decomposition reaction: These are types of reactions in which a substance will get decompose into two or more two products.
• But some carbonate compounds do not get decompose on heating.
• And therefore, does not produce carbon dioxide.
• For example Sodium carbonate and potassium carbonates.

Therefore, Sodium carbonates(Na₂CO₃) and potassium carbonate(K₂NO₃) are two carbonate salts that do not produce carbon dioxide on heating.