Multiple choice

Which among the following transition metal ions are colourless?

  1. Sc3+
  2. Mn2+
    3. Hg2+ 4. Fe3+ 5. Cu+

  1. 1, 2 and 3

  2. 1, 3 and 5

  3. 2, 3 and 4

  4. 2, 4 and 5

  5. 3, 4 and 5
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Transition metal ions exhibit colour due to the presence of unpaired electrons in (n−1) d-orbitals which undergo d-d transition. 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. Sc3+ (3d0), Cu+ (3d10), and Hg2+ (5d10): All are colourless

Keep practicing — related questions