Question

What of the following alkaline earth carbonates is thermally stable? (A) MgCO₃ (B) CaCO₃ (C) SrCO₃ (D) BaCO₃

Answer 1

MgCO3 is the most stable alkaline metal among all of them as it is present in the first period of the modern periodic table.

Its nuclear charge is less than the others present in the list.

This decreases the bond length and makes it more stable.

Answer 2

option A is the correct answer
MgCo3