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Question

The carbonate that is least stable thermally is:

A
BeCO3
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B
MgCO3
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C
BaCO3
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D
CaCO3
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Solution

The correct option is A BeCO3
As we move down the group, the size of the cations increases. Thus, the thermal stability also increases down the group. Since the size of Be is the smallest and it has a high charge density , BeCO3 is the least stable thermally.

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