Question

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

• A. $\ce{BaCO_3 > SrCO_3 > CaCO_3 > MgCO_3}$
• B. $\ce{MgCO_3 > CaCO_3 > SrCO_3 > BaCO_3}$
• C. $\ce{CaCO_3 > BaCO_3 > SrCO_3 > MgCO_3}$
• D. $\ce{BaCO_3 > CaCO_3 > SrCO_3 > MgCO_3}$

Answer 1

Answer: (B)

$\ce{MgCO_3 > CaCO_3 > SrCO_3 > BaCO_3}$

Answer 2

Solubility of carbonates decreases on moving down the group as hydration energy decreases.