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General Principles and processes of Isolation of Elements
hard
Correct match is
A
Bayer's method $-$ $Na_2CO_3$
B
Matte $-$ $98\%\,Cu_2S+2\%\,FeS$
C
van Arkel method $-$ $AgI$
D
Thomas slag $-$ Raw material for cement industry
Solution
Roasted mass obtained from roasting step is called matte. $98\%\,Cu_2S+2\%\,FeS$
Standard 12
Chemistry