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Atomic number of Cr and Fe are respectively 25 and 26, which of the following is paramagnetic?

1. [Cr(CO)6]
2. [Fe(CN)6]4-
3. [Cr(NH3)6]3+
4. [Fe(CN)6]3-

Correct answer: [Cr(NH3)6]3+

Solution

Paramagnetism arises from unpaired electrons. [Cr(NH3)6]3+ has Cr in the +3 oxidation state (d3 configuration), which has unpaired electrons, making it paramagnetic.

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