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Question

On heating which of the following $$CO_2$$ 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 $$MgCO_3$$
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. 
Hence the correct option is A.

Chemistry

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