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In which of the following ions , the colour is not due to d-d transition ?

Answer» <html><body><p> [CrO<sub>4</sub>]<sup>2’</sup></p><br/><br/><p>The colour of transition-metal compounds is normally associated with d-d <a href="https://interviewquestions.tuteehub.com/tag/transitions-1426107" style="font-weight:bold;" target="_blank" title="Click to know more about TRANSITIONS">TRANSITIONS</a>. However, some transition metal compounds <a href="https://interviewquestions.tuteehub.com/tag/show-642916" style="font-weight:bold;" target="_blank" title="Click to know more about SHOW">SHOW</a> intense colour in solution in spite of absence of d-electrons. For <a href="https://interviewquestions.tuteehub.com/tag/example-978283" style="font-weight:bold;" target="_blank" title="Click to know more about EXAMPLE">EXAMPLE</a>, the orange colour of TiBr<sub>4</sub>, yellow colour of CrO<sub>4</sub><sup>2-</sup>, orange colour of Cr<sub>2</sub>O<sub>2</sub><sup>7-</sup>, intense red colour of [Fe(SCN)<sub>4</sub>] and deep purple of MnO<sub>4</sub> are not due to d—d transitions. In the case of MnO<sub>4</sub> <a href="https://interviewquestions.tuteehub.com/tag/ion-1051153" style="font-weight:bold;" target="_blank" title="Click to know more about ION">ION</a>, the <a href="https://interviewquestions.tuteehub.com/tag/color-922196" style="font-weight:bold;" target="_blank" title="Click to know more about COLOR">COLOR</a> is due to charge transfer and not due to d-d transitions.</p></body></html>


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