Q.

The metal carbonate that is thermally least stable is 
 

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a

MgCO3 
 

b

BeCO3 
 

c

CaCO3 
 

d

BaCO3 
 

answer is D.

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Detailed Solution

Thermal stability of the carbonates increases down the group .
BeCO3​ <MgCO3 <CaCO3 <SrCO3 <BaCO3

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The metal carbonate that is thermally least stable is