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  4. The correct order of increasing thermal stability of K2CO3, MgCO3, CaCO3 and BeCO3 is

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Q. The correct order of increasing thermal stability of $K_2CO_3, MgCO_3, CaCO_3 $ and $ BeCO_3$ is

AIPMTAIPMT 2007The s-Block Elements

Solution:

Thermal stability of carbonates increases in a group as we move from top to bottom and decreases in a period as we move from left to right, so the correct order of thermal stability of given carbonates is $BeCO_3 < MgCO_3 < CaCO_3 < K_2CO_3$
$Be, Mg$ and $Ca$ are present in second group and $K$ is present in first group