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  4. On heating which of the following releases CO2 most easily ?

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Q. On heating which of the following releases $CO_2$ most easily ?

AIPMTAIPMT 2015The s-Block Elements

Solution:

On heating, $MgCO _3, CO _2$ releases most easily. This is due to the small size of the resulting oxide ion.
The radii of the oxide ion and $Mg ^{2+}$ ion are nearly same and hence they pack together tightly with the result its formation (i.e decomposition of its carbonate) is easy and requires less energy.