Answered

When MgCO3(s) is strongly heated, it produces solid MgO as gaseous CO2 is driven off.
Does the oxidation number of carbon change upon the formation of CO2?



Answer :

pyromorphite
[tex]MgCO_3--^T-->MgO + CO_2\uparrow[/tex]

the oxidation number of carbon in MgCO3 = +IV
the oxidation number of carbon in CO2 = +IV

so, there is no change

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