MetallurgyMedium
Question
Consider the following statements :
S1 : Poling process is used for the refining of copper and lead.
S2 : The scavenger which is used in the manufacture of steel is manganese.
S3 : The chemical composition of matte is Cu2O + Cu2S.
S4 : In the extraction of aluminium from alumina Al2O3 cryolite undergoes dissociation. and arrange in the order of true/false.
S1 : Poling process is used for the refining of copper and lead.
S2 : The scavenger which is used in the manufacture of steel is manganese.
S3 : The chemical composition of matte is Cu2O + Cu2S.
S4 : In the extraction of aluminium from alumina Al2O3 cryolite undergoes dissociation. and arrange in the order of true/false.
Options
A.F T F F
B.T T F F
C.F F T T
D.T T F T
Solution
S1 : It is used for copper and tin which contain the impurities of their own oxides.
S2 : It remove the impurities of N2 and O2 dissolved in molten steel.
S3 : Matte contains mostly Cu2S and some FeS.
S4 : Cryolite undergoes dissociation : Na3AlF6 → 3NaF + AlF3 : AlF3 → Al3+ + 3F- ; NaF → Na+ + F-
S2 : It remove the impurities of N2 and O2 dissolved in molten steel.
S3 : Matte contains mostly Cu2S and some FeS.
S4 : Cryolite undergoes dissociation : Na3AlF6 → 3NaF + AlF3 : AlF3 → Al3+ + 3F- ; NaF → Na+ + F-
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