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Question
Which of the carbonates given below is unstable in air and is kept in CO2 atmosphere to avoid decomposition.
Options
BeCO3
MgCO3
CaCO3
BaCO3
Solution
BeCO3
Explanation:
Due to least electropositive character or least basicity of Be, BeCO3 is less stable and hence decomposes to give BeO and CO2.
\[\ce{BeCO3 -> BeO + CO2}\]
Since the decomposition reaction is reversible, therefore, to increase the stability of BeCO3 or to reverse the above equilibrium, BeCO3 is kept in an atmosphere of CO2.
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