Crystal Field Theory
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CHXII09:COORDINATION COMPOUNDS

321816 Which of the following complex ions has electrons that are symmetrically filled in both \(\mathrm{t}_{2 \mathrm{~g}}\) and \(\mathrm{e}_{\mathrm{g}}\) orbitals?

1 \(\left[\mathrm{FeF}_{3}\right]^{3-}\)
2 \(\left[\mathrm{CoF}_{6}\right]^{3-}\)
3 \(\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{2+}\)
4 \(\left[\mathrm{Mn}(\mathrm{CN})_{6}\right]^{4-}\)
JEE - 2014
CHXII09:COORDINATION COMPOUNDS

321817 In which of the following complex ions, the metal ion will have \({\text{t}}_{{\text{2g}}}^{\text{6}}{\text{e}}_{\text{g}}^{\text{o}}\) configuration according to CFT?

1 \(\left[\mathrm{FeF}_{6}\right]^{3-}\)
2 \(\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{3-}\)
3 \(\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{4-}\)
4 \(\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{+2}\)
CHXII09:COORDINATION COMPOUNDS

321818 Number of complexes with even number of electrons in \({\mathrm{\mathrm{t}_{2 \mathrm{~g}}}}\) orbitals is
\[\begin{array}{l}
{\left[ {{\rm{Fe}}{{\left( {{{\rm{H}}_2}{\rm{O}}} \right)}_6}} \right]^{2 + }},{\left[ {{\rm{Co}}{{\left( {{{\rm{H}}_2}{\rm{O}}} \right)}_6}} \right]^{2 + }},{\left[ {{\rm{Co}}{{\left( {{{\rm{H}}_2}{\rm{O}}} \right)}_6}} \right]^{3 + }},\\
{\left[ {{\rm{Cu}}{{\left( {{{\rm{H}}_2}{\rm{O}}} \right)}_6}} \right]^{2 + }},{\left[ {{\rm{Cr}}{{\left( {{{\rm{H}}_2}{\rm{O}}} \right)}_6}} \right]^{2 + }}
\end{array}\]

1 3
2 5
3 2
4 1
JEE Main - 2024
CHXII09:COORDINATION COMPOUNDS

321819 \(\left[\mathrm{Co}\left(\mathrm{C}_{2} \mathrm{O}_{4}\right)_{3}\right]^{3-}\) is a

1 Low spin complex
2 Paramagnetic complex
3 High spin complex
4 \(\mathrm{sp}^{3} \mathrm{~d}^{2}-\) hybridised complex
AIIMS - 2019
CHXII09:COORDINATION COMPOUNDS

321820 Which complex of \(\mathrm{Co}^{2+}\) will have the weakest crystal field splitting?

1 \(\left[\mathrm{CoCl}_{6}\right]^{4-}\)
2 \(\left[\mathrm{Co}(\mathrm{CN})_{6}\right]^{4-}\)
3 \(\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{2+}\)
4 \(\left[\mathrm{Co}(\text { en })_{3}\right]^{2+}\)
NEET DIGITAL LIBRARY
CHXII09:COORDINATION COMPOUNDS

321816 Which of the following complex ions has electrons that are symmetrically filled in both \(\mathrm{t}_{2 \mathrm{~g}}\) and \(\mathrm{e}_{\mathrm{g}}\) orbitals?

1 \(\left[\mathrm{FeF}_{3}\right]^{3-}\)
2 \(\left[\mathrm{CoF}_{6}\right]^{3-}\)
3 \(\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{2+}\)
4 \(\left[\mathrm{Mn}(\mathrm{CN})_{6}\right]^{4-}\)
JEE - 2014
CHXII09:COORDINATION COMPOUNDS

321817 In which of the following complex ions, the metal ion will have \({\text{t}}_{{\text{2g}}}^{\text{6}}{\text{e}}_{\text{g}}^{\text{o}}\) configuration according to CFT?

1 \(\left[\mathrm{FeF}_{6}\right]^{3-}\)
2 \(\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{3-}\)
3 \(\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{4-}\)
4 \(\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{+2}\)
CHXII09:COORDINATION COMPOUNDS

321818 Number of complexes with even number of electrons in \({\mathrm{\mathrm{t}_{2 \mathrm{~g}}}}\) orbitals is
\[\begin{array}{l}
{\left[ {{\rm{Fe}}{{\left( {{{\rm{H}}_2}{\rm{O}}} \right)}_6}} \right]^{2 + }},{\left[ {{\rm{Co}}{{\left( {{{\rm{H}}_2}{\rm{O}}} \right)}_6}} \right]^{2 + }},{\left[ {{\rm{Co}}{{\left( {{{\rm{H}}_2}{\rm{O}}} \right)}_6}} \right]^{3 + }},\\
{\left[ {{\rm{Cu}}{{\left( {{{\rm{H}}_2}{\rm{O}}} \right)}_6}} \right]^{2 + }},{\left[ {{\rm{Cr}}{{\left( {{{\rm{H}}_2}{\rm{O}}} \right)}_6}} \right]^{2 + }}
\end{array}\]

1 3
2 5
3 2
4 1
JEE Main - 2024
CHXII09:COORDINATION COMPOUNDS

321819 \(\left[\mathrm{Co}\left(\mathrm{C}_{2} \mathrm{O}_{4}\right)_{3}\right]^{3-}\) is a

1 Low spin complex
2 Paramagnetic complex
3 High spin complex
4 \(\mathrm{sp}^{3} \mathrm{~d}^{2}-\) hybridised complex
AIIMS - 2019
CHXII09:COORDINATION COMPOUNDS

321820 Which complex of \(\mathrm{Co}^{2+}\) will have the weakest crystal field splitting?

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

321816 Which of the following complex ions has electrons that are symmetrically filled in both \(\mathrm{t}_{2 \mathrm{~g}}\) and \(\mathrm{e}_{\mathrm{g}}\) orbitals?

1 \(\left[\mathrm{FeF}_{3}\right]^{3-}\)
2 \(\left[\mathrm{CoF}_{6}\right]^{3-}\)
3 \(\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{2+}\)
4 \(\left[\mathrm{Mn}(\mathrm{CN})_{6}\right]^{4-}\)
JEE - 2014
CHXII09:COORDINATION COMPOUNDS

321817 In which of the following complex ions, the metal ion will have \({\text{t}}_{{\text{2g}}}^{\text{6}}{\text{e}}_{\text{g}}^{\text{o}}\) configuration according to CFT?

1 \(\left[\mathrm{FeF}_{6}\right]^{3-}\)
2 \(\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{3-}\)
3 \(\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{4-}\)
4 \(\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{+2}\)
CHXII09:COORDINATION COMPOUNDS

321818 Number of complexes with even number of electrons in \({\mathrm{\mathrm{t}_{2 \mathrm{~g}}}}\) orbitals is
\[\begin{array}{l}
{\left[ {{\rm{Fe}}{{\left( {{{\rm{H}}_2}{\rm{O}}} \right)}_6}} \right]^{2 + }},{\left[ {{\rm{Co}}{{\left( {{{\rm{H}}_2}{\rm{O}}} \right)}_6}} \right]^{2 + }},{\left[ {{\rm{Co}}{{\left( {{{\rm{H}}_2}{\rm{O}}} \right)}_6}} \right]^{3 + }},\\
{\left[ {{\rm{Cu}}{{\left( {{{\rm{H}}_2}{\rm{O}}} \right)}_6}} \right]^{2 + }},{\left[ {{\rm{Cr}}{{\left( {{{\rm{H}}_2}{\rm{O}}} \right)}_6}} \right]^{2 + }}
\end{array}\]

1 3
2 5
3 2
4 1
JEE Main - 2024
CHXII09:COORDINATION COMPOUNDS

321819 \(\left[\mathrm{Co}\left(\mathrm{C}_{2} \mathrm{O}_{4}\right)_{3}\right]^{3-}\) is a

1 Low spin complex
2 Paramagnetic complex
3 High spin complex
4 \(\mathrm{sp}^{3} \mathrm{~d}^{2}-\) hybridised complex
AIIMS - 2019
CHXII09:COORDINATION COMPOUNDS

321820 Which complex of \(\mathrm{Co}^{2+}\) will have the weakest crystal field splitting?

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

321816 Which of the following complex ions has electrons that are symmetrically filled in both \(\mathrm{t}_{2 \mathrm{~g}}\) and \(\mathrm{e}_{\mathrm{g}}\) orbitals?

1 \(\left[\mathrm{FeF}_{3}\right]^{3-}\)
2 \(\left[\mathrm{CoF}_{6}\right]^{3-}\)
3 \(\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{2+}\)
4 \(\left[\mathrm{Mn}(\mathrm{CN})_{6}\right]^{4-}\)
JEE - 2014
CHXII09:COORDINATION COMPOUNDS

321817 In which of the following complex ions, the metal ion will have \({\text{t}}_{{\text{2g}}}^{\text{6}}{\text{e}}_{\text{g}}^{\text{o}}\) configuration according to CFT?

1 \(\left[\mathrm{FeF}_{6}\right]^{3-}\)
2 \(\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{3-}\)
3 \(\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{4-}\)
4 \(\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{+2}\)
CHXII09:COORDINATION COMPOUNDS

321818 Number of complexes with even number of electrons in \({\mathrm{\mathrm{t}_{2 \mathrm{~g}}}}\) orbitals is
\[\begin{array}{l}
{\left[ {{\rm{Fe}}{{\left( {{{\rm{H}}_2}{\rm{O}}} \right)}_6}} \right]^{2 + }},{\left[ {{\rm{Co}}{{\left( {{{\rm{H}}_2}{\rm{O}}} \right)}_6}} \right]^{2 + }},{\left[ {{\rm{Co}}{{\left( {{{\rm{H}}_2}{\rm{O}}} \right)}_6}} \right]^{3 + }},\\
{\left[ {{\rm{Cu}}{{\left( {{{\rm{H}}_2}{\rm{O}}} \right)}_6}} \right]^{2 + }},{\left[ {{\rm{Cr}}{{\left( {{{\rm{H}}_2}{\rm{O}}} \right)}_6}} \right]^{2 + }}
\end{array}\]

1 3
2 5
3 2
4 1
JEE Main - 2024
CHXII09:COORDINATION COMPOUNDS

321819 \(\left[\mathrm{Co}\left(\mathrm{C}_{2} \mathrm{O}_{4}\right)_{3}\right]^{3-}\) is a

1 Low spin complex
2 Paramagnetic complex
3 High spin complex
4 \(\mathrm{sp}^{3} \mathrm{~d}^{2}-\) hybridised complex
AIIMS - 2019
CHXII09:COORDINATION COMPOUNDS

321820 Which complex of \(\mathrm{Co}^{2+}\) will have the weakest crystal field splitting?

1 \(\left[\mathrm{CoCl}_{6}\right]^{4-}\)
2 \(\left[\mathrm{Co}(\mathrm{CN})_{6}\right]^{4-}\)
3 \(\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{2+}\)
4 \(\left[\mathrm{Co}(\text { en })_{3}\right]^{2+}\)
NEET DIGITAL LIBRARY
CHXII09:COORDINATION COMPOUNDS

321816 Which of the following complex ions has electrons that are symmetrically filled in both \(\mathrm{t}_{2 \mathrm{~g}}\) and \(\mathrm{e}_{\mathrm{g}}\) orbitals?

1 \(\left[\mathrm{FeF}_{3}\right]^{3-}\)
2 \(\left[\mathrm{CoF}_{6}\right]^{3-}\)
3 \(\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{2+}\)
4 \(\left[\mathrm{Mn}(\mathrm{CN})_{6}\right]^{4-}\)
JEE - 2014
CHXII09:COORDINATION COMPOUNDS

321817 In which of the following complex ions, the metal ion will have \({\text{t}}_{{\text{2g}}}^{\text{6}}{\text{e}}_{\text{g}}^{\text{o}}\) configuration according to CFT?

1 \(\left[\mathrm{FeF}_{6}\right]^{3-}\)
2 \(\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{3-}\)
3 \(\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{4-}\)
4 \(\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{+2}\)
CHXII09:COORDINATION COMPOUNDS

321818 Number of complexes with even number of electrons in \({\mathrm{\mathrm{t}_{2 \mathrm{~g}}}}\) orbitals is
\[\begin{array}{l}
{\left[ {{\rm{Fe}}{{\left( {{{\rm{H}}_2}{\rm{O}}} \right)}_6}} \right]^{2 + }},{\left[ {{\rm{Co}}{{\left( {{{\rm{H}}_2}{\rm{O}}} \right)}_6}} \right]^{2 + }},{\left[ {{\rm{Co}}{{\left( {{{\rm{H}}_2}{\rm{O}}} \right)}_6}} \right]^{3 + }},\\
{\left[ {{\rm{Cu}}{{\left( {{{\rm{H}}_2}{\rm{O}}} \right)}_6}} \right]^{2 + }},{\left[ {{\rm{Cr}}{{\left( {{{\rm{H}}_2}{\rm{O}}} \right)}_6}} \right]^{2 + }}
\end{array}\]

1 3
2 5
3 2
4 1
JEE Main - 2024
CHXII09:COORDINATION COMPOUNDS

321819 \(\left[\mathrm{Co}\left(\mathrm{C}_{2} \mathrm{O}_{4}\right)_{3}\right]^{3-}\) is a

1 Low spin complex
2 Paramagnetic complex
3 High spin complex
4 \(\mathrm{sp}^{3} \mathrm{~d}^{2}-\) hybridised complex
AIIMS - 2019
CHXII09:COORDINATION COMPOUNDS

321820 Which complex of \(\mathrm{Co}^{2+}\) will have the weakest crystal field splitting?

1 \(\left[\mathrm{CoCl}_{6}\right]^{4-}\)
2 \(\left[\mathrm{Co}(\mathrm{CN})_{6}\right]^{4-}\)
3 \(\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{2+}\)
4 \(\left[\mathrm{Co}(\text { en })_{3}\right]^{2+}\)