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JEE Main levelSingle correct optionDifficulty 2 of 3mt024

Assertion (A): Baeyer's process is unsuitable for bauxite that contains a large amount of silica. Reason (R): Red mud, which contains , is formed as a residue in Baeyer's process.

  1. ABoth A and R are true and R is the correct explanation of A
  2. BBoth A and R are true but R is not the correct explanation of A
  3. CA is true but R is false
  4. DA is false but R is true

Answer: B

A is true because silica dissolves in the hot alkali, wasting and contaminating the aluminate solution, so the Serpeck process is used for high-silica bauxite. R is also a true fact, but red mud formation has nothing to do with the silica problem, so it is not the explanation.
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