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Which among the following is a paramagnetic complex?

1. [Mo(CO)6]
2. [Co(NH3)6]^3+
3. [Pt(en)Cl2]
4. [CoBr4]^2–

Correct answer: [CoBr4]^2–

Solution

Paramagnetism arises due to unpaired electrons. [CoBr4]^2– has Co in the +2 oxidation state (d7 configuration), leading to unpaired electrons, making it paramagnetic.

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