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In which one of the following metal carbonyls, CO forms a bridge between metal atoms?

1. [Mn 2 (CO) 10 ]
2. [Co 2 (CO) 8 ]
3. [Ru 3 (CO) 12 ]
4. [Os 3 (CO) 12 ]

Correct answer: [Co 2 (CO) 8 ]

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