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Question

On heating which of the following CO2 releases most easily?

A
MgCO3
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B
CaCO3
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C
K2CO3
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D
Na2CO3
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Solution

The correct option is B MgCO3
On heating, MgCO3, CO2 releases most easily. This is due to the small size of the resulting oxide ion.
The radii of the oxide ion and Mg2+ 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.
Hence the correct option is A.

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