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Which one of the following reaction represents calcination?

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Which one of the following reaction represents calcination? 

(a) 2Zn + O2 → 2ZnO 

(b) 2ZnS + 3O2 → 2ZnO + 2SO2

(c) MgCO3 → MgO + CO2

(d) Both (a) and (c)

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(c) MgCO3 → MgO + CO2

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