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Question:

The correct sequence of thermal stability of the following carbonates is:

BaCO3<CaCO3<SrCO3<MgCO3

MgCO3<CaCO3<SrCO3<BaCO3

MgCO3<SrCO3<CaCO3<BaCO3

BaCO3<SrCO3<CaCO3<MgCO3

Solution:

The thermal stability of alkaline earth metals carbonates increases down the group because down the group polarizing power of cation decreases. So thermal stability increases.Hence, thermal stability order :MgCO3<CaCO3<SrCO3<BaCO3