Which of the following changes is not observe | vedclass

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(C) Calcination is the process of heating an ore strongly in the absence of air to remove volatile impurities or moisture and to convert carbonates or

Vedclass · Accepted Answer

$PbS \rightarrow PbSO_4$

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(C) Calcination is the process of heating an ore strongly in the absence of air to remove volatile impurities or moisture and to convert carbonates or hydroxides into oxides.$PbCO_3 \rightarrow PbO + CO_2$ (Calcination)$Fe_2O_3 \cdot 3H_2O \rightarrow Fe_2O_3 + 3H_2O$ (Calcination)$PbS + 1.5O_2 \rightarrow PbO + SO_2$ (Roasting)$PbS + 2O_2 \rightarrow PbSO_4$ (Roasting)$PbSO_4$ is typically formed during the roasting of sulfide ores,not calcination.Therefore,the change $PbS \rightarrow PbSO_4$ is not observed during calcination.

Which of the following changes is not observed when an ore is heated for calcination?

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