Crystal Field Theory
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CHXII09:COORDINATION COMPOUNDS

321872 \({\mathrm{\left[\mathrm{ML}_{6}\right]^{\mathrm{n+}}}}\) is an octahedral complex. Its crystal field splitting energy \({\mathrm{\left(\Delta_{0}\right)}}\) is 1.8 eV . If same metal ion \({\mathrm{\left(\mathrm{M}^{\mathrm{n}+}\right)}}\) forms a tetrahedral complex with same ligands ( \({\mathrm{L}}\) ), then the crystal field splitting energy \({\mathrm{\left(\Delta_{t}\right)}}\) of \({\mathrm{\left[\mathrm{ML}_{4}\right]^{\mathrm{n}+}}}\) in eV is ____ .

1 1.8
2 0.8
3 3.6
4 5.4
CHXII09:COORDINATION COMPOUNDS

321873 Assertion :
\({{\rm{\Delta }}_{\rm{t}}}{\rm{ = }}\frac{{\rm{4}}}{{\rm{9}}}{{\rm{\Delta }}_{\rm{o}}}{\rm{.}}\)
Reason :
\({{\rm{\Delta }}_{\rm{O}}}\) is always greater than \({{\rm{\Delta }}_{\rm{t}}}\) for same metal ion and ligand.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
CHXII09:COORDINATION COMPOUNDS

321874 The crystal field stabilisation energy (CFSE) is highest for

1 \(\left[\mathrm{CoF}_{4}\right]^{2-}\)
2 \(\left[\mathrm{Co}(\mathrm{NCS})_{4}\right]^{2-}\)
3 \(\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}\)
4 \(\left[\mathrm{CoCl}_{4}\right]^{2-}\)
CHXII09:COORDINATION COMPOUNDS

321875 Which among the following is a correct order of increasing field strength of ligands?

1 \(\mathrm{I}^{-} < \mathrm{OH}^{-} < \mathrm{NH}_{3} < \mathrm{S}^{2-}\)
2 \(\mathrm{NH}_{3} < \mathrm{OH}^{-} < \mathrm{I}^{-} < \mathrm{S}^{2-}\)
3 \(\mathrm{OH}^{-} < \mathrm{S}^{2-} < \mathrm{I}^{-} < \mathrm{NH}_{3}\)
4 \(\mathrm{I}^{-} < \mathrm{S}^{2-} < \mathrm{OH}^{-} < \mathrm{NH}_{3}\)
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CHXII09:COORDINATION COMPOUNDS

321872 \({\mathrm{\left[\mathrm{ML}_{6}\right]^{\mathrm{n+}}}}\) is an octahedral complex. Its crystal field splitting energy \({\mathrm{\left(\Delta_{0}\right)}}\) is 1.8 eV . If same metal ion \({\mathrm{\left(\mathrm{M}^{\mathrm{n}+}\right)}}\) forms a tetrahedral complex with same ligands ( \({\mathrm{L}}\) ), then the crystal field splitting energy \({\mathrm{\left(\Delta_{t}\right)}}\) of \({\mathrm{\left[\mathrm{ML}_{4}\right]^{\mathrm{n}+}}}\) in eV is ____ .

1 1.8
2 0.8
3 3.6
4 5.4
CHXII09:COORDINATION COMPOUNDS

321873 Assertion :
\({{\rm{\Delta }}_{\rm{t}}}{\rm{ = }}\frac{{\rm{4}}}{{\rm{9}}}{{\rm{\Delta }}_{\rm{o}}}{\rm{.}}\)
Reason :
\({{\rm{\Delta }}_{\rm{O}}}\) is always greater than \({{\rm{\Delta }}_{\rm{t}}}\) for same metal ion and ligand.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
CHXII09:COORDINATION COMPOUNDS

321874 The crystal field stabilisation energy (CFSE) is highest for

1 \(\left[\mathrm{CoF}_{4}\right]^{2-}\)
2 \(\left[\mathrm{Co}(\mathrm{NCS})_{4}\right]^{2-}\)
3 \(\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}\)
4 \(\left[\mathrm{CoCl}_{4}\right]^{2-}\)
CHXII09:COORDINATION COMPOUNDS

321875 Which among the following is a correct order of increasing field strength of ligands?

1 \(\mathrm{I}^{-} < \mathrm{OH}^{-} < \mathrm{NH}_{3} < \mathrm{S}^{2-}\)
2 \(\mathrm{NH}_{3} < \mathrm{OH}^{-} < \mathrm{I}^{-} < \mathrm{S}^{2-}\)
3 \(\mathrm{OH}^{-} < \mathrm{S}^{2-} < \mathrm{I}^{-} < \mathrm{NH}_{3}\)
4 \(\mathrm{I}^{-} < \mathrm{S}^{2-} < \mathrm{OH}^{-} < \mathrm{NH}_{3}\)
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CHXII09:COORDINATION COMPOUNDS

321872 \({\mathrm{\left[\mathrm{ML}_{6}\right]^{\mathrm{n+}}}}\) is an octahedral complex. Its crystal field splitting energy \({\mathrm{\left(\Delta_{0}\right)}}\) is 1.8 eV . If same metal ion \({\mathrm{\left(\mathrm{M}^{\mathrm{n}+}\right)}}\) forms a tetrahedral complex with same ligands ( \({\mathrm{L}}\) ), then the crystal field splitting energy \({\mathrm{\left(\Delta_{t}\right)}}\) of \({\mathrm{\left[\mathrm{ML}_{4}\right]^{\mathrm{n}+}}}\) in eV is ____ .

1 1.8
2 0.8
3 3.6
4 5.4
CHXII09:COORDINATION COMPOUNDS

321873 Assertion :
\({{\rm{\Delta }}_{\rm{t}}}{\rm{ = }}\frac{{\rm{4}}}{{\rm{9}}}{{\rm{\Delta }}_{\rm{o}}}{\rm{.}}\)
Reason :
\({{\rm{\Delta }}_{\rm{O}}}\) is always greater than \({{\rm{\Delta }}_{\rm{t}}}\) for same metal ion and ligand.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
CHXII09:COORDINATION COMPOUNDS

321874 The crystal field stabilisation energy (CFSE) is highest for

1 \(\left[\mathrm{CoF}_{4}\right]^{2-}\)
2 \(\left[\mathrm{Co}(\mathrm{NCS})_{4}\right]^{2-}\)
3 \(\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}\)
4 \(\left[\mathrm{CoCl}_{4}\right]^{2-}\)
CHXII09:COORDINATION COMPOUNDS

321875 Which among the following is a correct order of increasing field strength of ligands?

1 \(\mathrm{I}^{-} < \mathrm{OH}^{-} < \mathrm{NH}_{3} < \mathrm{S}^{2-}\)
2 \(\mathrm{NH}_{3} < \mathrm{OH}^{-} < \mathrm{I}^{-} < \mathrm{S}^{2-}\)
3 \(\mathrm{OH}^{-} < \mathrm{S}^{2-} < \mathrm{I}^{-} < \mathrm{NH}_{3}\)
4 \(\mathrm{I}^{-} < \mathrm{S}^{2-} < \mathrm{OH}^{-} < \mathrm{NH}_{3}\)
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CHXII09:COORDINATION COMPOUNDS

321872 \({\mathrm{\left[\mathrm{ML}_{6}\right]^{\mathrm{n+}}}}\) is an octahedral complex. Its crystal field splitting energy \({\mathrm{\left(\Delta_{0}\right)}}\) is 1.8 eV . If same metal ion \({\mathrm{\left(\mathrm{M}^{\mathrm{n}+}\right)}}\) forms a tetrahedral complex with same ligands ( \({\mathrm{L}}\) ), then the crystal field splitting energy \({\mathrm{\left(\Delta_{t}\right)}}\) of \({\mathrm{\left[\mathrm{ML}_{4}\right]^{\mathrm{n}+}}}\) in eV is ____ .

1 1.8
2 0.8
3 3.6
4 5.4
CHXII09:COORDINATION COMPOUNDS

321873 Assertion :
\({{\rm{\Delta }}_{\rm{t}}}{\rm{ = }}\frac{{\rm{4}}}{{\rm{9}}}{{\rm{\Delta }}_{\rm{o}}}{\rm{.}}\)
Reason :
\({{\rm{\Delta }}_{\rm{O}}}\) is always greater than \({{\rm{\Delta }}_{\rm{t}}}\) for same metal ion and ligand.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
CHXII09:COORDINATION COMPOUNDS

321874 The crystal field stabilisation energy (CFSE) is highest for

1 \(\left[\mathrm{CoF}_{4}\right]^{2-}\)
2 \(\left[\mathrm{Co}(\mathrm{NCS})_{4}\right]^{2-}\)
3 \(\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}\)
4 \(\left[\mathrm{CoCl}_{4}\right]^{2-}\)
CHXII09:COORDINATION COMPOUNDS

321875 Which among the following is a correct order of increasing field strength of ligands?

1 \(\mathrm{I}^{-} < \mathrm{OH}^{-} < \mathrm{NH}_{3} < \mathrm{S}^{2-}\)
2 \(\mathrm{NH}_{3} < \mathrm{OH}^{-} < \mathrm{I}^{-} < \mathrm{S}^{2-}\)
3 \(\mathrm{OH}^{-} < \mathrm{S}^{2-} < \mathrm{I}^{-} < \mathrm{NH}_{3}\)
4 \(\mathrm{I}^{-} < \mathrm{S}^{2-} < \mathrm{OH}^{-} < \mathrm{NH}_{3}\)
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