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Coordination Compounds question

2015 · Shift 0 · Q17
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Coordination Compounds question

2015 · Shift 0 · Q17

JEE MainChemistryCoordination CompoundsMCQ+4 / −1
Which of the following compounds is not colored yellow?
  1. A
    K3[Co(NO2)6]K_3[Co(NO_2)_6]K3​[Co(NO2​)6​]
  2. B
    (NH4)3[As(Mo3O10)4](NH_4)_3[As(Mo_3O_{10})_4](NH4​)3​[As(Mo3​O10​)4​]
  3. C
    BaCrO4BaCrO_4BaCrO4​
  4. D
    Zn2[Fe(CN)6]Zn_2[Fe(CN)_6]Zn2​[Fe(CN)6​]
View written solutionFree

Correct answer: D

  1. Identify the known colors of each compound

We check the characteristic colors of the given coordination/inorganic compounds:

  • A: K3[Co(NO2)6]K_3[Co(NO_2)_6]K3​[Co(NO2​)6​]

    This is potassium cobaltinitrite, which is a yellow compound/precipitate.

  • B: (NH4)3[As(Mo3O10)4](NH_4)_3[As(Mo_3O_{10})_4](NH4​)3​[As(Mo3​O10​)4​]

    This is ammonium arsenomolybdate, known to be yellow.

  • C: BaCrO4BaCrO_4BaCrO4​

    Barium chromate is a well-known yellow precipitate.

  • D: Zn2[Fe(CN)6]Zn_2[Fe(CN)_6]Zn2​[Fe(CN)6​]

    Zinc ferrocyanide is white (or nearly white), not yellow.

  1. Find the compound which is not yellow

From the above:

  • A: yellow
  • B: yellow
  • C: yellow
  • D: white

Therefore, the compound which is not colored yellow is:

Zn2[Fe(CN)6]\boxed{Zn_2[Fe(CN)_6]}Zn2​[Fe(CN)6​]​

  1. Compare with stored correct answer
  • Derived answer: D
  • Stored correct answer: D

They match.

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