(B) The process of heating carbonate ores in the absence of air or in a limited supply of air to convert them into their respective metal oxides is ca

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(B) The process of heating carbonate ores in the absence of air or in a limited supply of air to convert them into their respective metal oxides is called $Calcination$. For example, $ZnCO_3 \xrightarrow{\Delta} ZnO + CO_2$. In contrast, $Roasting$ involves heating sulfide ores in the presence of excess air.