Which alkaline earth metal carbonate decompos | vedclass

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Question

(A) The thermal stability of alkaline earth metal carbonates increases down the group as the electropositive character of the metal increases.$Mg^{2+}

Vedclass · Accepted Answer

$MgCO_3$

Vedclass · Answer

(A) The thermal stability of alkaline earth metal carbonates increases down the group as the electropositive character of the metal increases.$Mg^{2+}$ has the smallest ionic radius among the given options, which leads to high polarising power.This high polarising power distorts the electron cloud of the carbonate ion $(CO_3^{2-})$ more effectively, weakening the $C-O$ bond.Therefore, $MgCO_3$ requires the least amount of energy to decompose compared to $CaCO_3$, $SrCO_3$, and $BaCO_3$.

Which alkaline earth metal carbonate decomposes most easily?

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