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  4. The change in oxidation state of Pb when galena is roasted for the lead extraction from it’s low grade ore. Give your answer as integer.

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Q. The change in oxidation state of $Pb$ when galena is roasted for the lead extraction from it’s low grade ore.
Give your answer as integer.

NTA AbhyasNTA Abhyas 2022

Solution:

$PbS \rightarrow PbO$ (on roasting). There is no difference in Oxidation state of lead during roasting of galena.