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JEE Main levelSingle correct optionDifficulty 2 of 3df027

Assertion (A): Addition of molybdenum increases the catalytic efficiency of iron in the Haber process. Reason (R): A promoter is itself the main catalyst for the reaction and works independently of the primary catalyst.

  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

Mo is a promoter: it improves the activity of Fe, so A is true. A promoter has little or no catalytic action of its own and only enhances the primary catalyst, so R is false.
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