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JEE Advanced levelSingle correct optionDifficulty 3 of 3mt106

Assertion (A): For an ore containing silica as gangue, calcium oxide is used as the flux in smelting. Reason (R): is an acidic oxide and therefore combines with silica to give a fusible slag. Choose:

  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: C

Silica is an acidic gangue, so a basic flux is needed, and gives a fusible slag; A is true. is a basic oxide, not an acidic one, so R is false.
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