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Metallurgy — Chemistry STD 10 — Question

ICSE BoardEnglish MediumSTD 10ChemistryMetallurgy1 Mark
MCQ
What are insoluble impurities called which are left behind in dissolving bauxite?
  • A
    Red mud
  • B
    Black mud
  • C
    Alumina
  • D
    Both (a) and (b)
✓

Answer

A. Red mud
Explanation: Red mud consists of ferric oxide and sand. It is produced when bauxite dissolves in NaOH and produces useful compound sodium meta aluminate and impurities which are termed as red mud.

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