Q.

Which of the carbonates given below is unstable in air and is kept in CO2, atmosphere to avoid decomposition?

Moderate

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By Expert Faculty of Sri Chaitanya

BeCO3

MgCO3

CaCO3

BaCO3

answer is A.

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Detailed Solution

(1) BeCO3 is unstable to the extent that it is stable only in an atmosphere of CO2. BeCO3 shows a reversible reaction because the stability of oxide formed is more than carbonates.BeCO3⇌BeO+CO2BeCO3 is unstable due to the strong polarising effect of small Be2+ ions on the large polarisable carbonation. Moreover, extra stability of the oxide achieved through lattice energy by packing small cation with a small oxide ion.

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