Which has highest thermal stability?

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${BeCO}_{3}$

${BaCO}_{3}$

${MgCO}_{3}$

${CaCO}_{3}$

answer is C.

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Detailed Solution

Barium carbonate ( ${BaCO}_{3}$ ) has highest thermal stability

The most thermally stable compound is barium carbonate. Alkaline earth metals get more electropositive as they move down the group. Their thermal stability also improves as a result. The carbonate ion will be affected more by positive ions with smaller sizes and larger charge densities.

Hence, option C is correct

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