SATHEE: Transition and InnerTransition Elements

Transition and InnerTransition Elements - Result Question 93

####20. Which of the following compounds is not yellow coloured?

(2015 Main)

(a) $Z n_{2} [F e (C N)_{6}]$

(b) $K_{3} [C o {(N O_{2})}_{6}]$

(d) $B a C r O_{4}$

Show Answer

Solution:

$Z n_{2} [F e (C N)_{6}], K_{3} [C o {(N O_{2})}_{6}]$ and ${(N H_{4})}_{3}$ As ${[M o_{3} O_{10}]}_{4}$ show colour due to $d$ - $d$ transition while $B a C r O_{4}$ is coloured due to charge transfer phenomenon.

Further according to spectrochemical series the strong ligand possessing complex has higher energy and hence lower wavelength. Therefore, complexes containing $N O_{2}, N H_{4}^{+}, O^{2 -}$ etc., ligands show yellow colour while $C N^{-}$ forces the complex to impart white colour.

Spectrochemical series

$I^{-} < B r^{-} < S^{2 -} < S C N^{-} < C l^{-} < N O_{3}^{-} < N_{3}^{-} < F^{-} < O H^{-}$

$< C_{2} O_{4}^{2 -} \approx H_{2} O < N C S^{-} < C H_{3} C N <$ py $< N H_{3} <$ en

$<$ bipy $<$ Phen $< N O_{2}^{-} < P P h_{3} < C N^{-} \approx C O$

Transition and InnerTransition Elements - Result Question 93

Solution:

Spectrochemical series

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Transition and InnerTransition Elements - Result Question 93

Solution:

Spectrochemical series

Engineering Preparation

Medical Preparation

NCERT Books & Solutions

Important Resources

Other Resources

Syllabus

Test Platform

Sample Mock Test

Mentorship

NCERT Exercise Video Solution

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