First slide

Alkaline earth metals

Question

Correct order of stability of group IIA metal carbonate is:

Moderate

A

${MgCO}_{3} > {CaCO}_{3} > {SrCO}_{3} > {BaCO}_{3}$
B

${BaCO}_{3} > {SrCO}_{3} > {CaCO}_{3} > {MgCO}_{3}$
C

${SrCO}_{3} > {BaCO}_{3} > {CaCO}_{3} > {MgCO}_{3}$
D

${CaCO}_{3} > {MgCO}_{3} > {BaCO}_{3} > {SrCO}_{3}$

Solution

The thermal stability of IIA carbonates increases on moving down the group due to the increase of electropositive character of the metal or basicity of the metal hydroxide. Thus, BeCO₃ is least thermally stable while BaCO₃ is most thermally stable.

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