Discuss the trend of the following:Thermal stability of carbonates of

1.	Discuss the trend of the following:Thermal stability of carbonates of Group 2 elements.
Answer» All the alkaline earth metals form carbonates (MCO₃). All these carbonates decompose on heating to give CO₂ and metal oxide. The thermal stability; of these carbonates increases down the group, i.e., from Be to Ba, BeCO₃ < MgCO₃ < CaCO₃ < SrCO₃ < BaCO₃ BeCO₃ is unstable to the extent that it is stable only in atmosphere of CO₂. It however shows reversible decomposition in closed container BeCO₃ ⇌ BeO + CO₂ Hence, more is the stability of oxide formed, less will be stability of carbonates. Stability of oxides decreases down the group. Since beryllium oxide is high stable, it makes BeCO₃unstable.

Discuss the trend of the following:Thermal stability of carbonates of Group 2 elements.

Answer»

All the alkaline earth metals form carbonates (MCO₃). All these carbonates decompose on heating to give CO₂ and metal oxide. The thermal stability; of these carbonates increases down the group, i.e., from Be to Ba,
BeCO₃ < MgCO₃ < CaCO₃ < SrCO₃ < BaCO₃
BeCO₃ is unstable to the extent that it is stable only in atmosphere of CO₂. It however shows reversible decomposition in closed container

BeCO₃ ⇌ BeO + CO₂

Hence, more is the stability of oxide formed, less will be stability of carbonates. Stability of oxides decreases down the group. Since beryllium oxide is high stable, it makes BeCO₃unstable.

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