The decomposition temperature is maximum for

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(B) The thermal stability of metal carbonates increases as the electropositive character of the metal increases. $BeCO_3$ is highly unstable and decom

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$Na_2CO_3$

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(B) The thermal stability of metal carbonates increases as the electropositive character of the metal increases. $BeCO_3$ is highly unstable and decomposes at room temperature. $Li_2CO_3$ is also relatively unstable compared to other alkali metal carbonates. Among the given options,$Na_2CO_3$ is a carbonate of an alkali metal (Group $1$),which is more electropositive than the alkaline earth metals ($Be$ and $Ca$). Therefore,$Na_2CO_3$ has the highest thermal stability and the maximum decomposition temperature.

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