The coordination entity, for which crystal field splitting is smallest, absorbs light of lowest frequency. Weaker the ligand field strength, smallest will be the crystal field splitting. The order of field strength of ligands is as, \(\mathrm{CN}^{-}>\)en \(>\mathrm{NH}_{3}>\mathrm{Cl}^{-}\)Hence, \(\left[\mathrm{CrCl}_{6}\right]^{3-}\) (due to the presence of weak field \(\mathrm{Cl}^{-}\)ligands) absorbs light of lowest frequency.
AIIMS - 2009
CHXII09:COORDINATION COMPOUNDS
321803
Match Column I with Column II :
Choose the correct answer from the options given below:
1 A - R, B - Q , C - P, D - S
2 A - Q , B - R, C - S, D - P
3 A - S, B - P, C - R, D - Q
4 A - R, B - P, C - Q , D - S
Explanation:
Stronger the ligand, higher will be the CFSE value thus, order of energy is \(\left[\mathrm{Co}(\mathrm{CN})_{6}\right]^{3-}>\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}>\) \(\left[\mathrm{CoCl}\left(\mathrm{NH}_{3}\right)_{5}\right]^{2+}>\left[\mathrm{Cu}\left(\mathrm{H}_{2} \mathrm{O}\right)_{4}\right]^{2+}\) As energy is inversely proportional to wavelength, hence order of wavelength will be
JEE - 2023
CHXII09:COORDINATION COMPOUNDS
321804
Which of the following compounds is not colored yellow?
\(\mathrm{Zn}_{2}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]\) is white.
CHXII09:COORDINATION COMPOUNDS
321805
\(\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{4-}\) and \(\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}\) are of different colours in dilute solutions. Why?
1 \(\mathrm{CN}^{-}\)is strong ligand results in more CFSE while \(\mathrm{H}_{2} \mathrm{O}\) is a weak ligand results in less CFSE
2 d-d transition energy in both complexes is different
3 Colour is different due to difference in wavelength of light absorbed
4 All the above
Explanation:
The colour of particular coordination compound depends on the magnitude of the CFSE which in turn depends on nature of ligand. \(\mathrm{CN}^{-}\)being strong ligand results more CFSE than \(\mathrm{H}_{2} \mathrm{O}\) which is weak ligand. Therefore, energy for intra d-d transition differs and thus colour also differs.
The coordination entity, for which crystal field splitting is smallest, absorbs light of lowest frequency. Weaker the ligand field strength, smallest will be the crystal field splitting. The order of field strength of ligands is as, \(\mathrm{CN}^{-}>\)en \(>\mathrm{NH}_{3}>\mathrm{Cl}^{-}\)Hence, \(\left[\mathrm{CrCl}_{6}\right]^{3-}\) (due to the presence of weak field \(\mathrm{Cl}^{-}\)ligands) absorbs light of lowest frequency.
AIIMS - 2009
CHXII09:COORDINATION COMPOUNDS
321803
Match Column I with Column II :
Choose the correct answer from the options given below:
1 A - R, B - Q , C - P, D - S
2 A - Q , B - R, C - S, D - P
3 A - S, B - P, C - R, D - Q
4 A - R, B - P, C - Q , D - S
Explanation:
Stronger the ligand, higher will be the CFSE value thus, order of energy is \(\left[\mathrm{Co}(\mathrm{CN})_{6}\right]^{3-}>\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}>\) \(\left[\mathrm{CoCl}\left(\mathrm{NH}_{3}\right)_{5}\right]^{2+}>\left[\mathrm{Cu}\left(\mathrm{H}_{2} \mathrm{O}\right)_{4}\right]^{2+}\) As energy is inversely proportional to wavelength, hence order of wavelength will be
JEE - 2023
CHXII09:COORDINATION COMPOUNDS
321804
Which of the following compounds is not colored yellow?
\(\mathrm{Zn}_{2}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]\) is white.
CHXII09:COORDINATION COMPOUNDS
321805
\(\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{4-}\) and \(\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}\) are of different colours in dilute solutions. Why?
1 \(\mathrm{CN}^{-}\)is strong ligand results in more CFSE while \(\mathrm{H}_{2} \mathrm{O}\) is a weak ligand results in less CFSE
2 d-d transition energy in both complexes is different
3 Colour is different due to difference in wavelength of light absorbed
4 All the above
Explanation:
The colour of particular coordination compound depends on the magnitude of the CFSE which in turn depends on nature of ligand. \(\mathrm{CN}^{-}\)being strong ligand results more CFSE than \(\mathrm{H}_{2} \mathrm{O}\) which is weak ligand. Therefore, energy for intra d-d transition differs and thus colour also differs.
The coordination entity, for which crystal field splitting is smallest, absorbs light of lowest frequency. Weaker the ligand field strength, smallest will be the crystal field splitting. The order of field strength of ligands is as, \(\mathrm{CN}^{-}>\)en \(>\mathrm{NH}_{3}>\mathrm{Cl}^{-}\)Hence, \(\left[\mathrm{CrCl}_{6}\right]^{3-}\) (due to the presence of weak field \(\mathrm{Cl}^{-}\)ligands) absorbs light of lowest frequency.
AIIMS - 2009
CHXII09:COORDINATION COMPOUNDS
321803
Match Column I with Column II :
Choose the correct answer from the options given below:
1 A - R, B - Q , C - P, D - S
2 A - Q , B - R, C - S, D - P
3 A - S, B - P, C - R, D - Q
4 A - R, B - P, C - Q , D - S
Explanation:
Stronger the ligand, higher will be the CFSE value thus, order of energy is \(\left[\mathrm{Co}(\mathrm{CN})_{6}\right]^{3-}>\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}>\) \(\left[\mathrm{CoCl}\left(\mathrm{NH}_{3}\right)_{5}\right]^{2+}>\left[\mathrm{Cu}\left(\mathrm{H}_{2} \mathrm{O}\right)_{4}\right]^{2+}\) As energy is inversely proportional to wavelength, hence order of wavelength will be
JEE - 2023
CHXII09:COORDINATION COMPOUNDS
321804
Which of the following compounds is not colored yellow?
\(\mathrm{Zn}_{2}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]\) is white.
CHXII09:COORDINATION COMPOUNDS
321805
\(\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{4-}\) and \(\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}\) are of different colours in dilute solutions. Why?
1 \(\mathrm{CN}^{-}\)is strong ligand results in more CFSE while \(\mathrm{H}_{2} \mathrm{O}\) is a weak ligand results in less CFSE
2 d-d transition energy in both complexes is different
3 Colour is different due to difference in wavelength of light absorbed
4 All the above
Explanation:
The colour of particular coordination compound depends on the magnitude of the CFSE which in turn depends on nature of ligand. \(\mathrm{CN}^{-}\)being strong ligand results more CFSE than \(\mathrm{H}_{2} \mathrm{O}\) which is weak ligand. Therefore, energy for intra d-d transition differs and thus colour also differs.
The coordination entity, for which crystal field splitting is smallest, absorbs light of lowest frequency. Weaker the ligand field strength, smallest will be the crystal field splitting. The order of field strength of ligands is as, \(\mathrm{CN}^{-}>\)en \(>\mathrm{NH}_{3}>\mathrm{Cl}^{-}\)Hence, \(\left[\mathrm{CrCl}_{6}\right]^{3-}\) (due to the presence of weak field \(\mathrm{Cl}^{-}\)ligands) absorbs light of lowest frequency.
AIIMS - 2009
CHXII09:COORDINATION COMPOUNDS
321803
Match Column I with Column II :
Choose the correct answer from the options given below:
1 A - R, B - Q , C - P, D - S
2 A - Q , B - R, C - S, D - P
3 A - S, B - P, C - R, D - Q
4 A - R, B - P, C - Q , D - S
Explanation:
Stronger the ligand, higher will be the CFSE value thus, order of energy is \(\left[\mathrm{Co}(\mathrm{CN})_{6}\right]^{3-}>\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}>\) \(\left[\mathrm{CoCl}\left(\mathrm{NH}_{3}\right)_{5}\right]^{2+}>\left[\mathrm{Cu}\left(\mathrm{H}_{2} \mathrm{O}\right)_{4}\right]^{2+}\) As energy is inversely proportional to wavelength, hence order of wavelength will be
JEE - 2023
CHXII09:COORDINATION COMPOUNDS
321804
Which of the following compounds is not colored yellow?
\(\mathrm{Zn}_{2}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]\) is white.
CHXII09:COORDINATION COMPOUNDS
321805
\(\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{4-}\) and \(\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}\) are of different colours in dilute solutions. Why?
1 \(\mathrm{CN}^{-}\)is strong ligand results in more CFSE while \(\mathrm{H}_{2} \mathrm{O}\) is a weak ligand results in less CFSE
2 d-d transition energy in both complexes is different
3 Colour is different due to difference in wavelength of light absorbed
4 All the above
Explanation:
The colour of particular coordination compound depends on the magnitude of the CFSE which in turn depends on nature of ligand. \(\mathrm{CN}^{-}\)being strong ligand results more CFSE than \(\mathrm{H}_{2} \mathrm{O}\) which is weak ligand. Therefore, energy for intra d-d transition differs and thus colour also differs.
