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(A) The thermal stability of carbonates of alkali and alkaline earth metals increases as the electropositive character of the metal increases down the

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$IV < II < III < I$

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(A) The thermal stability of carbonates of alkali and alkaline earth metals increases as the electropositive character of the metal increases down the group. $BeCO_3$ is the least stable due to the small size and high polarizing power of $Be^{2+}$ ion. $MgCO_3$ is more stable than $BeCO_3$. $CaCO_3$ is more stable than $MgCO_3$. $K_2CO_3$ (an alkali metal carbonate) is the most stable among the given compounds. Therefore,the increasing order of thermal stability is: $IV (BeCO_3) < II (MgCO_3) < III (CaCO_3) < I (K_2CO_3)$.

Arrange the following compounds in the increasing order of their thermal stability: $I. K_2CO_3, II. MgCO_3, III. CaCO_3, IV. BeCO_3$.

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