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The complex that dissolves in water is

1. (NH 4 ) 3 [As(Mo 3 O 10 ) 4 ]
2. Fe 4 [Fe(CN) 6 ] 3
3. K 3 [Co(NO 2 ) 6 ]
4. [Fe 3 (OH) 2 (OAc) 6 ] Cl

Correct answer: [Fe 3 (OH) 2 (OAc) 6 ] Cl

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