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Which of the following compounds is not colored yellow ?

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

Correct answer: Zn 2 [Fe(CN) 6 ]

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