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Which of the following complex compounds will exhibit highest paramagnetic behaviour?

1. [Ti(NH₃)₆]³⁺
2. [Cr(NH₃)₆]³⁺
3. [Co(NH₃)₆]³⁺
4. [Zn(NH₃)₆]²⁺

Correct answer: [Cr(NH₃)₆]³⁺

Solution

Paramagnetic behavior depends on the number of unpaired electrons. [Cr(NH₃)₆]³⁺ has a d³ configuration with three unpaired electrons, making it the most paramagnetic among the options.

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