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Q.

On heating which of the following releases CO2 most easily?

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a

Na2CO3

b

MgCO3

c

CaCO3

d

K2CO3

answer is B.

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Detailed Solution

Stability of carbonates increases down the group with increase in the size of metal  Alkali metal carbonates are most stable and do not decompose on heating Hence, MgCO3 is least stable and it releases CO2 most easily. MgCO3⟶ΔMgO+CO2
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