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Q.

Most soluble in water among the following is

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a

BaCO3

b

MgCO3

c

CaCO3

d

SrCO3

answer is B.

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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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