Multiple choice

Which of the following sets represents paramagnetic metal ions only?

  1. Sc3+, Ti4+, Cu2+, Zn2+

  2. Sc3+, Fe3+, Ni2+, Cu2+

  3. Mn3+, Fe3+, Ni2+, Cu2+

  4. Ti4+, Ni2+, Cu2+, Zn2+

  5. Mn3+, Fe3+, Ni2+, Zn2+
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Mn3+: 3d4, 4 unpaired electrons; paramagnetic Fe3+: 3d5, Five unpaired electrons; paramagnetic Ni2+: 3d8, 2 unpaired electrons; paramagnetic Cu2+: 3d9, One unpaired electrons; paramagnetic

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