Multiple choice

Which of the following pairs represent first row transition metal ions with equal number of unpaired electrons?

  1. Ti3+ and Cu2+
  2. Ti2+ and Zn2+
  3. V2+ and Co2+
  4. Cr3+ and Fe3+ Select the correct answer using codes given below:

  1. 1 and 2

  2. 1 and 3

  3. 1 and 4

  4. 2 and 3

  5. 2 and 4
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Ti3+: [Ar] 3d1; 1 unpaired electron Cu2+: [Ar] 3d9; 1 unpaired electron

V2+: [Ar] 3d3; 3 unpaired electrons Co2+: [Ar] 3d7; 3 unpaired electrons

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