JEE Main Chemistry question

Chemistry General Principles and Processes of Isolation of Elements (Metallurgy)JEE Main

Not in JEE Main or NEET syllabus

When copper pyrites is roasted in excess of air, a mixture of is formed. is present as impurities. This can be removed as slag during reduction of . The flux added to form slag is [DCE 2009]

(A) which is an acid fluxCorrect
(B)Lime stone, which is a basic flux
(C), which is basic flux
(D), which is basic flux

Answer: (A)

Solution

FeO is a basic oxide impurity, so an acidic flux is needed to combine with it and form a fusible slag: . Here is correctly identified as an acidic flux.

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Question ID VK-145256