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The flame colours of metal ions are du...

The flame colours of metal ions are due to

A

Frenkel defect

B

Schottky defect

C

Metal deficiency defect

D

Metal excess defect

Text Solution

Verified by Experts

Flame colours are due to metal excess defect. What happens that in some ionic crystals, there becomes an excess of metal atom, which by loosing `e^(-)` , change into ions. These electrons can absorb energy and go into excited states from ground state. Thus, the absorption of certain wavelength of light takes place and crystal becomes coloured according to complementary colour. The spaces occupied by extra are called F-centres.
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The colour of transition metal ions is due to ............... in d-subshell and .............. transition.

Name : two coloured metal ions.

Colour of transition metal ions are due to absorption of some wavelength. This results in

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:

The colour of the transition metal ions is//are due to:

The colour of the transition metal ions is due to

The colour of transition metal ion is attributed to:

The colour of transition metal ion is attributed to:

VMC MODULES ENGLISH-THE SOLID STATE-LEVEL-1
  1. If a cation leaves a site in solid lattice, and is located at an inter...

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  2. Schottky defect occurs mainly in electrovalent compounds where

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  3. Which of the following statements is correct?

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  4. In a face centred cubic arrangement of A and B atoms whose A atoms are...

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  5. Which of the following defects, if present, lowers the density of the ...

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  6. Schottky defect is generally observed in :

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  7. The flame colours of metal ions are due to

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  8. Doping of silicon (Si) with boron (B) leads to the formation of

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  9. Density of a crystal remains unchanged as a result of :

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  10. Which of the following statement is true?

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  11. If we mix a pentavalent impurity in a crystal lattice of germanium, wh...

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  12. Which of the following has the highest value of energy gap ?

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  13. The elements commonly used for making transistors are :

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  14. How many 'nearest' and 'next nearest' neighbours respectively does sod...

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  15. The cation/anion radius ratio for a triangular arrangement of anions i...

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  16. if a metal has a bcc crystal structure, the coordination number is 8,b...

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  17. In a ccp structure, the :

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  18. The numbers of tetrahedral and octahedral holes in a ccp array of 100 ...

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  19. The size of Cl^(-) ion is 1.8Å . The size of a cation for which a chan...

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  20. Lithium forms body centred cubic structure. The length of the side of ...

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