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(B) The thermal stability of carbonates of group $1$ and group $2$ elements increases as the size of the cation increases.For group $2$ carbonates $(B

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$IV < II < III < I$

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(B) The thermal stability of carbonates of group $1$ and group $2$ elements increases as the size of the cation increases.For group $2$ carbonates $(BeCO_3, MgCO_3, CaCO_3)$,the thermal stability increases down the group as the size of the cation increases: $Be^{2+} Thus,the order for group $2$ carbonates is $BeCO_3 Group $1$ carbonates (like $K_2CO_3$) are generally more thermally stable than group $2$ carbonates due to the lower charge density of the alkali metal cation.Therefore,the overall increasing order of thermal stability is $BeCO_3 < MgCO_3 < CaCO_3 < K_2CO_3$,which corresponds to $IV < II < III < I$.

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

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