Multiple choice

Which of the following metal ions are colourless?

  1. Cu2+
  2. Ag+
  3. V5+
  4. Cd2+
  5. Ti3+

  1. 1 and 2

  2. 1 and 3

  3. 2, 3 and 4

  4. 3, 4 and 5

  5. 4 and 5
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Correct answer. The metal ions not having unpaired electrons (n−1)d0 or having completely filled d orbital (n−1)d10 do not absorb radiations in visible region, since d-d transitions are not possible. Hence, they are colourless ions. Among the given ions, Ag+ (4d10), V5+ (3d0), Cd2+ (4d10) are colourless.

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