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JEE Main levelSingle correct optionDifficulty 2 of 3df123

Assertion (A): Aqueous solutions of zinc(II) salts are colourless. Reason (R): has a completely filled configuration, so no d-d transition is possible.

  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: A

is , so there is no vacant d level to receive an excited electron, and no visible light is absorbed. R therefore explains A.
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