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The coordination numbers of Co and Al in [Co(Cl)(en) 2 ]Cl and K 3 [Al(C 2 O 4 ) 3 ], respectively, are : (en = ethane-1, 2-diamine)

1. 3 and 3
2. 6 and 6
3. 5 and 3
4. 5 and 6

Correct answer: 5 and 6

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