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If a transition-metla compound absorbs v...

If a transition-metla compound absorbs violet-indigo radiation in the visible region Its colour would be .

A

Green

B

Yellow

C

Orange

D

Blue

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The correct Answer is:
B
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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 is paramagnetic as well as coloured ion?

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 is a coloured ion?

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. Select the correct statement:

Assertion (A) : Non-stoichiometric compounds are called Bertholide compounds. NaCl and KCl crystal, when heated in an atmosphere of Na and K varpours, respectively, they impart violet and yellow colours to NaCl and KCl , respectively. Reason (R ) : Metal excess defect is due to the presence of extra cations atg the interstitial sites. The excess metal ions move to the interstitial sites and the electrons to the neighbouring sites. The colour results byt the excitation of these electrons by absorbing suitable energy from visible light. When the excited electroon comes back to the ground state, there is emission of radiation in the visible region and gives complimentary colour.

Many ionic compounds in transition metal ions are colored because of the electronic transitions (in the visible range) involving d electrons, whereas the ionic compounds of the representative elements are usually colorless. Which of the following compounds is green in color?

Transition metals normally have unfilled 'd' orbitals which are degenerate. The colour of transition metal ions is due to absorption of light in visible region. Which of the following transition is responsible for providing the colour?

CENGAGE CHEMISTRY-COORDINATION COMPOUNDS-Exercises Single Correct (Hybridisation , Magnetic And Optical Properties )
  1. The d- electron configurations of Mn^(2+),Fe^(2+),Co^(3+) and Ni^(2+) ...

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  2. Which of the folliwng is paramagnetic ? .

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  3. The pair in which both species have same magnetic moment (spin only va...

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  4. Select the correct order of magnetic moment (inBM) from the folliwng o...

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  5. Which of the pair of complex compounds are tettrahedral as well as dia...

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  6. Which of the following has a square planar geometry? .

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  7. Among [Ni(CO)(4)],[Ni(CN)(4)]^(2-) and [NiBr(4)]^(2-) species, the hyb...

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  8. Coordination compounds plays many important roles in animals and plant...

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  9. A substance which is not paramagnetic is .

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  10. Which of the following statements is correct ?

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  11. An aqueous solution of titanium bromide shows zero magnetic moment. As...

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  12. Geometry, hybridisation and magnetic moment of the ions [Ni(CN)(4)]^(2...

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  13. The correct order of magnetic moment (spin values in is . (Atomic num...

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  14. A square planar complex is formed by hybridisation of which atomic ori...

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  15. The colour of a complex compound is due to .

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  16. If a transition-metla compound absorbs violet-indigo radiation in the ...

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  17. Transition metal compounds are usually coloured This is due to the ele...

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  18. Which of the following compound is not coloured ?

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  19. The colour of Cu^(o+) compounds is .

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