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JCECE Engineering JCECE Engineering Solved Paper-2014

  • question_answer
    Consider the following statements. I. Colour of a transition metal complex is dependent on energy difference between two \[d-\]levels. II. Colour of the complex is dependent on the nature of the ligand and the type of complex formed. III. \[ZnS{{O}_{4}}\] and \[Ti{{O}_{2}}\] are white as in both,\[d-d\] spectra are impossible. Select the correct statements.

    A)  I, II and III                          

    B)  I and II

    C)   II and III                             

    D)   I and III

    Correct Answer: A

    Solution :

    Colour of transition metal complex is dependent on energy difference between\[{{t}_{2g}}\]and \[{{e}_{g}}\] sets of\[d-\]orbitals, nature of ligand and type of complex formed, \[d-d\] transition is possible in \[{{d}^{1}}\] and\[{{d}^{9}}\] ions. That is why such ion complexes are coloured. On the other hand,\[{{d}^{0}}\]  and \[{{d}^{0}}\] ions (such of\[Z{{n}^{2+}},\,\,T{{i}^{4+}})\] cannot show\[d-d\]transition, hence colourless.


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