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Question

Chemistry Question on GROUP 2 ELEMENTS

The correct sequence of thermal stability of the following carbonates is

A

BaCO3<CaCO3<SrCO3<MgCO3{BaCO3 < CaCO3 < SrCO3 < MgCO3}

B

MgCO3<CaCO3<SrCO3<BaCO3{MgCO3 < CaCO3 < SrCO3 < BaCO3}

C

BaCO3<SrCO3<CaCO3<MgCO3{BaCO3 < SrCO3 < CaCO3 < MgCO3}

D

MgCO3<SrCO3<CaCO3<BaCO3{MgCO3 < SrCO3 < CaCO3 < BaCO3}

Answer

MgCO3<CaCO3<SrCO3<BaCO3{MgCO3 < CaCO3 < SrCO3 < BaCO3}

Explanation

Solution

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{MgCO3 < CaCO3 < SrCO3 < BaCO3}