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Which among the following is a paramagnetic complex? [NEET Kar. 2013]
  • a)
    Mo(CO)6
  • b)
    [Co(NH3)6]3+
  • c)
    [Pt(en)Cl2]
  • d)
    [CoBr4]2– (At. No. of Mo = 42, Pt = 78)
Correct answer is option 'D'. Can you explain this answer?
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Which among the following is a paramagnetic complex? [NEET Kar. 2013]a...
is weak ligand.
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Which among the following is a paramagnetic complex? [NEET Kar. 2013]a...
The correct answer is d) [CoBr4]2.

Paramagnetic complexes have unpaired electrons, which can be determined by the presence of odd number of electrons in the metal's d-orbitals.

a) Mo(CO)6: Molybdenum (Mo) is in the 6th group and has 6 valence electrons, but the complex is neutral and has 18 electrons, so there are no unpaired electrons. It is diamagnetic.
b) [Co(NH3)6]3: Cobalt (Co) is in the 9th group and has 9 valence electrons, but the complex is charged and has 23 electrons, so there are no unpaired electrons. It is diamagnetic.
c) [Pt(en)Cl2]: Platinum (Pt) is in the 10th group and has 10 valence electrons, but the complex is neutral and has 16 electrons, so there are no unpaired electrons. It is diamagnetic.
d) [CoBr4]2: Cobalt (Co) is in the 9th group and has 9 valence electrons, and the complex is charged and has 35 electrons, so there is one unpaired electron. It is paramagnetic.
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Which among the following is a paramagnetic complex? [NEET Kar. 2013]a)Mo(CO)6b)[Co(NH3)6]3+c)[Pt(en)Cl2]d)[CoBr4]2– (At. No. of Mo = 42, Pt = 78)Correct answer is option 'D'. Can you explain this answer? for Class 12 2025 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about Which among the following is a paramagnetic complex? [NEET Kar. 2013]a)Mo(CO)6b)[Co(NH3)6]3+c)[Pt(en)Cl2]d)[CoBr4]2– (At. No. of Mo = 42, Pt = 78)Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for Class 12 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which among the following is a paramagnetic complex? [NEET Kar. 2013]a)Mo(CO)6b)[Co(NH3)6]3+c)[Pt(en)Cl2]d)[CoBr4]2– (At. No. of Mo = 42, Pt = 78)Correct answer is option 'D'. Can you explain this answer?.
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