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The red colour of ruby is due to:
- a)d-d transition of Cr3+ ion in Cr2O3 lattice
- b)d-d transition of Cr3+ ion in Al2O3 lattice
- c)Ligand to metal charge transfer transition
- d)Metal to metal charge transfer transition
Correct answer is option 'B'. Can you explain this answer?
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Most Upvoted Answer
The red colour of ruby is due to:a)d-d transition of Cr3+ ion in Cr2O3...
Explanation:
The red colour of ruby is due to the presence of Cr3+ ion in Al2O3 (aluminium oxide) lattice. The detailed explanation is as follows:
d-d transition of Cr3+ ion:
When the Cr3+ ion is present in the Al2O3 lattice, it gets surrounded by six oxygen atoms in an octahedral geometry. The Cr3+ ion has three d-electrons in its outermost shell, which can undergo d-d electronic transitions when they absorb light. The energy required for these transitions corresponds to the energy of visible light, which is in the range of 400-700 nm.
Absorption of light:
When white light falls on the ruby crystal, it gets absorbed by the Cr3+ ions present in the crystal. This absorption leads to the excitation of electrons from the ground state to higher energy levels. The energy gap between the ground state and the excited state corresponds to the wavelength of light absorbed, which results in the complementary colour being observed.
Colour of Ruby:
In the case of ruby, the red colour is observed because the Cr3+ ion undergoes d-d transition from the t2g energy levels to the eg energy levels, which corresponds to the absorption of green light (wavelength = 550 nm). This results in the complementary colour, which is red (wavelength = 700 nm), being observed by the human eye.
Conclusion:
Thus, it can be concluded that the red colour of ruby is due to the d-d transition of the Cr3+ ion in the Al2O3 lattice.
The red colour of ruby is due to the presence of Cr3+ ion in Al2O3 (aluminium oxide) lattice. The detailed explanation is as follows:
d-d transition of Cr3+ ion:
When the Cr3+ ion is present in the Al2O3 lattice, it gets surrounded by six oxygen atoms in an octahedral geometry. The Cr3+ ion has three d-electrons in its outermost shell, which can undergo d-d electronic transitions when they absorb light. The energy required for these transitions corresponds to the energy of visible light, which is in the range of 400-700 nm.
Absorption of light:
When white light falls on the ruby crystal, it gets absorbed by the Cr3+ ions present in the crystal. This absorption leads to the excitation of electrons from the ground state to higher energy levels. The energy gap between the ground state and the excited state corresponds to the wavelength of light absorbed, which results in the complementary colour being observed.
Colour of Ruby:
In the case of ruby, the red colour is observed because the Cr3+ ion undergoes d-d transition from the t2g energy levels to the eg energy levels, which corresponds to the absorption of green light (wavelength = 550 nm). This results in the complementary colour, which is red (wavelength = 700 nm), being observed by the human eye.
Conclusion:
Thus, it can be concluded that the red colour of ruby is due to the d-d transition of the Cr3+ ion in the Al2O3 lattice.
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The red colour of ruby is due to:a)d-d transition of Cr3+ ion in Cr2O3...
The mineral corundum is a crystalline form of alumina: Al2O3. A pure crystal of corundum is colorless. However, if just 1% of the Al3+ ions are replaced with Cr3+ ions, the mineral becomes deep red in color and is known as ruby (Al2O3:Cr3+)
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The red colour of ruby is due to:a)d-d transition of Cr3+ ion in Cr2O3 latticeb)d-d transition of Cr3+ ion in Al2O3 latticec)Ligand to metal charge transfer transitiond)Metal to metal charge transfer transitionCorrect answer is option 'B'. Can you explain this answer?
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