On heating which of the following releases `CO_2` most easily ?

Options

A. `MgCO_(3)`
B. `CaCO_(3)`
C. `K_(2)CO_(3)`
D. `Na_(2)CO_(3)`

Answer

A

Explanation

Thermal stability `prop(1)/("Ionic potential "(phi))`
`phi=("Charge")/("Size")`
Thermal solubility
`K_(2)CO_(3) gt Na_(2)CO_(3) gt CaCO_(3) gt MgCO_(3)`
`Na_(2)CO_(3) overset(Delta)tox`
`K_(2)CO_(3) overset(Delta)to x`
`MgCO_(3) overset(Delta)toMgO+CO_(2)`
`CaCO_(3) overset(Delta)to CaO+CO_(2)`