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(B) The thermal stability of carbonates increases as the polarizing power of the cation decreases.$1.$ $BeCO_3$ $(IV)$ is the least stable due to the

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$IV < II < III < I$

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(B) The thermal stability of carbonates increases as the polarizing power of the cation decreases.$1.$ $BeCO_3$ $(IV)$ is the least stable due to the high polarizing power of $Be^{2+}$.$2.$ Among alkaline earth metal carbonates ($II$ and $III$),stability increases down the group: $BeCO_3 $3.$ Alkali metal carbonates $(I)$ are much more stable than alkaline earth metal carbonates because alkali metals have lower charge $(+1)$ and lower polarizing power.Therefore,the correct order of increasing thermal stability is $IV < II < III < I$.

List-$I$	List-$II$
$(A)$ $P(E_2)$	$(i)$ $1/4$
$(B)$ $P(E_1 \cup E_2)$	$(ii)$ $5/8$
$(C)$ $P(\bar{E}_1 / \bar{E}_2)$	$(iii)$ $1/8$
$(D)$ $P(E_1 / \bar{E}_2)$	$(iv)$ $1/2$
	$(v)$ $3/8$
	$(vi)$ $3/4$

The following compounds have been arranged in order of their increasing thermal stabilities. Identify the correct order.
$I.$ $K_2CO_3$ $II.$ $MgCO_3$
$III.$ $CaCO_3$ $IV.$ $BeCO_3$

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The following compounds have been arranged in order of their increasing thermal stabilities. Identify the correct order.$I.$ $K_2CO_3$ $II.$ $MgCO_3$$III.$ $CaCO_3$ $IV.$ $BeCO_3$