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JEE Main2015Chemistryd and f Block ElementsActual

Which one of the following compounds is not a yellow colored compound ?

Options

  1. AB a C r O 4
  2. BZ n 2 F e C N 6
  3. CK 3 C o N O 2 6
  4. DN H 4 3 [ A s M o 3 O 10 4 ]

Correct answer

B. Z n 2 F e C N 6

Step-by-step solution

Colour of the compounds is due to transition of electrons. Cyanides are not yellow. BaCrO 4 - Yellow K 3 Co NO 2 6 - Yellow NH 4 3 As Mo 3 O 1 0 - Yellow Z n 2 F e C N 6 is bluish white.

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