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In which of the following compounds (s),...

In which of the following compounds (s), the colour is due to the charge transfer spectra

A

`KMnO_(4)`

B

`CrO_(3)`

C

`CuCl_(2)`

D

`Cu_(2)O`

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The correct Answer is:
A, B, D
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The colours of the transition metal are due to d-d excitation. The energy required for d-d electron axcitation is available in the visible range. Transition metal ions have the tendency to absorb certain rediations from the visible region and exhibit the complementary colour. The transition metal ions which have completely filled d-orbitals are colourless as the excitation of electron or electrons is not possible within d-orbitals. The transition metal ions which have completely empthy d-orbitals are also colourless. In KMnO_4 and K_2Cr_2O_7 , there are no unpaired electrons at the central atom but they are dep in colour. The colour of these compounds is due to charge transfer spectrum. for example in MnO_4 electron is momentrily transferred from O to the metal and thuys oxygen changes from O^(2-) and O^(ɵ) maganese from Mn^(7+) to Mn^(6+) . Q. Which of the following compounds is (are) coloured due to charge transfer spectra and not due to d-d transition?

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NARAYNA-D BLOCK & TRANSITION ELEMENTS-Level-VI (H.W)
  1. The colour of the transition metal ions is due to

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  2. Select the correct statement(s) with respect to oxides and oxoanions o...

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  3. In which of the following compounds (s), the colour is due to the char...

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  4. Transition element act as good catalysts because

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  5. The true statement among the following are:

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  6. Which of the following oxides are amphoteric?

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  7. Which of the following are nonferrous alloys?

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  8. In the formation of intersitital compounds by transition metals, ident...

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  9. Which of the following is/are correct about Wilkinson's catalyst?

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  10. Which of the following statement(s) is /are correct for the alloys, br...

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  11. The E^(0) values are Zn^(2+)//Zn:-0.76V,Fe^(2+)//Fe:-0.44V, Ni^(2...

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  12. The E^(0) values are Zn^(2+)//Zn:-0.76V,Fe^(2+)//Fe:-0.44V, Ni^(2...

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  13. The E^(0) values are Zn^(2+)//Zn:-0.76V,Fe^(2+)//Fe:-0.44V, Ni^(2...

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  14. The transition metals and their compounds have paramagnetic properties...

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  15. The transition metals and their compounds have paramagnetic properties...

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  16. The transition metals and their compounds have paramagnetic properties...

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  17. The (n-1)d shell of electron in d-block elements is expanding and, the...

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  18. The (n-1)d shell of electron in d-block elements is expanding and, the...

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  19. Paramagnetism is a property due to the presence of unpaired electrons....

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  20. Paramagnetism is a property due to the presence of unpaired electrons....

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