Multiple choice

Which of the following is a pair of paramagnetic complexes?

  1. [W(CO)6] and [Cr(NH3)6]3+

  2. [Co(NH3)6]3+ and [W(CO)6]

  3. [Fe(CN)6]3- and [Co(NH3)6]3+

  4. [Co(NH3)6]3+ and [Cr(NH3)6]3+

  5. [Cr(NH3)6]3+ and [Fe(CN)6]3-
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

[Cr(NH3)6]3+: t2g3 eg0; 3 unpaired electrons; paramagnetic [Fe(CN)6]3-: t2g5 eg0; one unpaired electron; paramagnetic

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