Which reaction is not possible for calcinatio | vedclass

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(C) Calcination is a process of heating an ore in a limited supply of air or in the absence of air to remove volatile impurities or water of hydration

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$PbS 	o PbSO_4$

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(C) Calcination is a process of heating an ore in a limited supply of air or in the absence of air to remove volatile impurities or water of hydration,or to decompose carbonates into oxides.$PbCO_3 	o PbO + CO_2$ is a calcination reaction.$Fe_2O_3 \cdot 3H_2O 	o Fe_2O_3 + 3H_2O$ is a calcination reaction (removal of water).$PbS 	o PbSO_4$ is an oxidation reaction (roasting),not calcination,as it involves the addition of oxygen to a sulfide ore.$PbSO_4$ is already an oxidized form and does not undergo calcination under standard conditions.Therefore,the reaction $PbS 	o PbSO_4$ is a roasting process,not calcination.

Which reaction is not possible for calcination?

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