The correct option is(A): MgCO3
Thermal stability order \({K_2CO_3 > Na_3CO_3 > Ca CO_3 >MgCO_3}\) Therefore \({MgCO_3}\) releases \({CO_2}\) most easily \({MgCO_3 ->[\Delta] MgO + CO_2}\)
Which of the following has the highest hydration energy?