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(B) Thermal stability of metal carbonates increases down the group as the ionic radius of the cation increases and its polarising power decreases.Grou

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$IV < II < III < I$

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(B) Thermal stability of metal carbonates increases down the group as the ionic radius of the cation increases and its polarising power decreases.Group $1$ carbonates are more thermally stable than Group $2$ carbonates because Group $1$ cations have a smaller charge $(+1)$ and a larger ionic radius compared to Group $2$ cations $(+2)$.Among Group $2$ carbonates,the thermal stability increases as: $BeCO_3 Since $K_2CO_3$ belongs to Group $1$,it is more stable than all the given Group $2$ carbonates.Therefore,the correct order of increasing thermal stability is: $BeCO_3(IV) < MgCO_3(II) < CaCO_3(III) < K_2CO_3(I)$.

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

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