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The colour of potassium dichromate is due to:
- a)d–d transition
- b)Transition in K+ ion.
- c)Ligand to metal charge transfer
- d)Metal-to-ligand charge transfer
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
The colour of potassium dichromate is due to:a)d–d transitionb)T...
Explanation:
The colour of potassium dichromate is due to Ligand to metal charge transfer.
- Potassium dichromate (K2Cr2O7) is an inorganic compound that contains the dichromate ion (Cr2O7 2-) as a ligand and potassium ions (K+) as the metal.
- When light interacts with a compound, it can be absorbed by the electrons present in the compound's atoms or ions.
- In the case of potassium dichromate, the dichromate ion (Cr2O7 2-) acts as a ligand and donates a pair of electrons to the central chromium ion (Cr).
- The dichromate ion has a deep orange color due to the presence of multiple double bonds between the oxygen and chromium atoms.
- When light passes through potassium dichromate, the electrons in the oxygen atoms of the dichromate ion absorb certain wavelengths of light.
- These absorbed wavelengths correspond to the complementary color of orange, which is blue.
- As a result, the transmitted light appears blue, giving potassium dichromate its characteristic color.
To summarize:
- The colour of potassium dichromate is due to ligand to metal charge transfer.
- The dichromate ion acts as a ligand and donates electrons to the central chromium ion.
- The absorption of specific wavelengths of light by the ligand-metal complex leads to the observed color of potassium dichromate.
The colour of potassium dichromate is due to Ligand to metal charge transfer.
- Potassium dichromate (K2Cr2O7) is an inorganic compound that contains the dichromate ion (Cr2O7 2-) as a ligand and potassium ions (K+) as the metal.
- When light interacts with a compound, it can be absorbed by the electrons present in the compound's atoms or ions.
- In the case of potassium dichromate, the dichromate ion (Cr2O7 2-) acts as a ligand and donates a pair of electrons to the central chromium ion (Cr).
- The dichromate ion has a deep orange color due to the presence of multiple double bonds between the oxygen and chromium atoms.
- When light passes through potassium dichromate, the electrons in the oxygen atoms of the dichromate ion absorb certain wavelengths of light.
- These absorbed wavelengths correspond to the complementary color of orange, which is blue.
- As a result, the transmitted light appears blue, giving potassium dichromate its characteristic color.
To summarize:
- The colour of potassium dichromate is due to ligand to metal charge transfer.
- The dichromate ion acts as a ligand and donates electrons to the central chromium ion.
- The absorption of specific wavelengths of light by the ligand-metal complex leads to the observed color of potassium dichromate.
Most Upvoted Answer
The colour of potassium dichromate is due to:a)d–d transitionb)T...
Potssium dichromate(K2Cr2O7) and potassium permangnate(KMnO4) both are coloured compounds.The purple colour KMnO4 and reddish yellow colour of K2Cr2O7 is due the charge transfer spectra.The deep purple color of the solution of KMnO4 is because-- an electron from a “oxygen lone pair” character orbital is transferred to .
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Community Answer
The colour of potassium dichromate is due to:a)d–d transitionb)T...
Explanation:
The colour of potassium dichromate is due to ligand to metal charge transfer.
Ligand to metal charge transfer (LMCT) is a process where a metal ion accepts an electron from a ligand, resulting in a charge transfer that leads to the formation of a complex with a different colour.
Potassium dichromate is a bright orange-red crystalline solid that is commonly used as an oxidising agent in many chemical reactions. The colour of potassium dichromate is due to the presence of Cr2O72- ions, which are the chromate ions.
In the presence of a ligand, such as water, the chromate ion undergoes LMCT, where the electron in the ligand is transferred to the metal ion. This results in the formation of a complex with a different colour.
In the case of potassium dichromate, the orange-red colour is due to the LMCT between the chromate ion and water molecules. The water molecules act as the ligands, and the Cr2O72- ion acts as the metal ion.
As the ligands vary, the colour of the complex changes. For example, the colour of the complex formed between the chromate ion and ammonia is yellow. This is because the ammonia molecules donate electrons to the metal ion, resulting in a different LMCT process and a different colour.
In conclusion, the colour of potassium dichromate is due to LMCT between the chromate ion and water molecules, resulting in the formation of an orange-red complex.
The colour of potassium dichromate is due to ligand to metal charge transfer.
Ligand to metal charge transfer (LMCT) is a process where a metal ion accepts an electron from a ligand, resulting in a charge transfer that leads to the formation of a complex with a different colour.
Potassium dichromate is a bright orange-red crystalline solid that is commonly used as an oxidising agent in many chemical reactions. The colour of potassium dichromate is due to the presence of Cr2O72- ions, which are the chromate ions.
In the presence of a ligand, such as water, the chromate ion undergoes LMCT, where the electron in the ligand is transferred to the metal ion. This results in the formation of a complex with a different colour.
In the case of potassium dichromate, the orange-red colour is due to the LMCT between the chromate ion and water molecules. The water molecules act as the ligands, and the Cr2O72- ion acts as the metal ion.
As the ligands vary, the colour of the complex changes. For example, the colour of the complex formed between the chromate ion and ammonia is yellow. This is because the ammonia molecules donate electrons to the metal ion, resulting in a different LMCT process and a different colour.
In conclusion, the colour of potassium dichromate is due to LMCT between the chromate ion and water molecules, resulting in the formation of an orange-red complex.
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