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