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  • Metal carbonates decompose on heating to give metal oxide and carbon dioxide. Which of the metal carbonates is most stable thermally?

Metal carbonates decompose on heating to give metal oxide and carbon dioxide. Which of the metal carbonates is most stable thermally?(i) $\mathrm{MgCO}_3$
(ii) $\mathrm{CaCO}_3$
(iii) $\mathrm{SrCO}_3$
(iv) $\mathrm{BaCO}_3$

Answers (1)

The answer is the option $(i v) \mathrm{MCO}_3 \rightarrow \mathrm{MO}+\mathrm{CO}_2$

 

Thermal stability of $\mathrm{MCO}_3$ depends on the stability of MO. If MO is stable $\mathrm{MCO}_3$ is unstable and vice versa

BaO is the least stable making BaCO3 mthe ost stable. 

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infoexpert24

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