Which among the following is insoluble in water

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${BaCO}_{3}$

${MgCO}_{3}$

All of these

${CaCO}_{3}$

answer is D.

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Detailed Solution

Thermal stability(Thermal decomposition temperature)….BaCO₃>SrCO₃>CaCO₃>MgCO₃>BeCO₃ ;

In fact BeCO₃ does not exist in nature. It is stored in an atmosphere of CO₂ ;

Down the group for Second group carbonates….Lattice Enthalpy almost remains constant and Hydration Enthalpy decreases.

Thus solubility down the group decreases ;

Solubility…BeCO₃>MgCO₃>CaCO₃>SrCO₃>BaCO₃ ;

In fact all carbonates are insoluble in water :

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