Questions
Which of the carbonates given below is unstable in air and is kept in CO2, atmosphere to avoid decomposition?
a
BeCO3
b
MgCO3
c
CaCO3
d
BaCO3
detailed solution
Correct option is A
(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.Talk to our academic expert!
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