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Which of the following compounds is not colored yellow ?

1. (NH4)3[As(Mo3O10)4]
2. BaCrO4
3. Zn2[Fe(CN)6]
4. K3[Co(NO2)6]

Correct answer: Zn2[Fe(CN)6]

Solution

(NH4)3[As(Mo3O10)4] (ammonium arsenomolybdate), BaCrO4 and K3[Co(NO2)6] are all yellow. Zn2[Fe(CN)6] (zinc ferrocyanide) is a white precipitate, so it is the one not coloured yellow.

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