Question

Which is the correct sequence of solubility of carbonates of alkaline earth metals? 

(a) BaCO₃ > SrCO₃ > CaCO_{​​​​​​​3} > MgCO_{​​​​​​​3} 

(b) MgCO_{​​​​​​​3} > CaCO_{​​​​​​​3} > SrCO_{​​​​​​​3} > BaCO_{​​​​​​​3} 

(c) CaCO_{​​​​​​​3} > BaCO_{​​​​​​​3} > SrCO_{​​​​​​​3} > MgCO_{​​​​​​​3} 

(d) BaCO_{​​​​​​​3} > CaCO_{​​​​​​​3} > SrCO_{​​​​​​​3} > MgCO_{​​​​​​​3}

Answer 1

(b) MgCO₃ > CaCO_{​​​​​​​3} > SrCO_{​​​​​​​3} > BaCO_{​​​​​​​3} 

Solubility of carbonates decreases down the group.