Chemistry - Metallurgy Question with Solution | TestHub
ChemistryMetallurgyExtraction of MetalsMedium2 minQB
ChemistryMediumsingle choice
NaCN is sometimes added in the froth flotation process as a depressant when ZnS and PbS minerals are expected because :
Options:
Answer:
B
Solution:
NaCN acts as a depressant to selectively separate a mixture of zinc sulfide (ZnS) and lead sulfide (PbS) minerals. It reacts with ZnS to form a water-soluble complex, Na₂[Zn(CN)₄], which prevents ZnS from coming into the froth. Meanwhile, PbS does not react with NaCN and is allowed to freely rise to the surface with the froth. This chemical differentiation successfully separates galena (PbS) from zinc blende (ZnS) during the flotation process.
Stream:JEESubject:ChemistryTopic:MetallurgySubtopic:Extraction of Metals
⏱ 2mℹ️ Source: QB
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