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Which of the following complexes will exhibit maximum attraction to an applied magnetic field?

1. [Ni(H 2 O) 6 ] 2+
2. [Co(en) 3 ] 3+
3. [Zn(H 2 O) 6 ] 2+
4. [Co(H 2 O) 6 ] 2+

Correct answer: [Co(H 2 O) 6 ] 2+

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