Q.

Correct order of stability of group IIA metal carbonate is:

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a

MgCO3>CaCO3>SrCO3>BaCO3

b

BaCO3>SrCO3>CaCO3>MgCO3

c

SrCO3>BaCO3>CaCO3>MgCO3

d

CaCO3>MgCO3>BaCO3>SrCO3

answer is B.

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Detailed 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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