The correct order of increasing thermal stability of K2CO3 , MgCO3 , CaCO3 and BeCO3 is

1. A. BeCO3 < MgCO3 < CaCO3 < K2CO3
2. B. MgCO3 < BeCO3 < CaCO3 < K2CO3
3. C. K2CO3 < MgCO3 < CaCO3 < BeCO3
4. D. BeCO3 < MgCO3 < K2CO3 < CaCO3

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