As the cation size increases down the group, the metal carbonates become more ionic in nature. Hence, the thermal stability increases as: BeCO₃

Question

As the cation size increases down the group, the metal carbonates become more ionic in nature. Hence, the thermal stability increases as: BeCO₃ < MgCO₃ < CaCO₃.

Accepted Answer

CaCO₃. As the cation size increases down the group, the lattice energy decreases, but the polarizing power of the cation also decreases, making the carbonate ion less distorted. This increases the thermal stability of the carbonates, with CaCO₃ being the most stable.

As the cation size increases down the group, the metal carbonates become more ionic in nature. Hence, the thermal stability increases as: BeCO₃ < MgCO₃ < CaCO₃.

Solution

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