Question

a metallic carbonate stable towards heat is: a- Cuco3 b-Znco3 c-na2co3 d-caco3

Answer 1

$Na_{2}CO_{3}$ : Sodium Carbonate is a metallic carbonate stable towards heat.

• Sodium carbonate is a metallic carbonate formed by group 1 element of the modern periodic table.

• It is thermally stable and doesn't undergo any decomposition in presence of heat.

• This is mainly due to small size of sodium ion along with electropositivity which results in a high lattice enthalpy.

• Hence , it is thermally stable.

However the other metallic carbonates given in the options undergo thermal decomposition to produce metallic oxides.

For example:

$\boxed{\sf{ZnCO_{3}\overset{\Delta}{\longrightarrow}ZnO + CO_{2}}}$

Hope It Helps.