Valence Bond Theory
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CHXII09:COORDINATION COMPOUNDS

322303 \({\text{B}}{{\text{a}}^{{\text{2 + }}}}{\text{,C}}{{\text{N}}^{\text{ - }}}{\text{ & C}}{{\text{o}}^{{\text{2 + }}}}\) ions form an ionic complex. If this complex is \(75 \%\) ionised in aqueous solution with van't Hoff factor equal to 4 and \(\mu\) \((\) magnetic moment \()=1.73\) B.M. Then, the possible hybridisation of cobalt in the complex is

1 \(\mathrm{sp}^{3} \mathrm{~d}\)
2 \({{\text{d}}^{\text{2}}}{{\text{s}}^{\text{3}}}\)
3 \(\mathrm{sp}^{3} \mathrm{~d}^{2}\)
4 \(\mathrm{dsp}^{3}\)
CHXII09:COORDINATION COMPOUNDS

322304 The hybridisation and magnetic behaviour of cobalt ion in \(\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}\) complex, respectively is

1 \(\mathrm{sp}^{3} \mathrm{~d}^{2}\) and paramagnetic
2 \(\mathrm{sp}^{3} \mathrm{~d}^{2}\) and diamagnetic.
3 \(\mathrm{d}^{2} \mathrm{sp}^{3}\) and diamagnetic
4 \({{\rm{d}}^2}{\rm{s}}{{\rm{p}}^3}\) and paramagnetic
JEE - 2023
CHXII09:COORDINATION COMPOUNDS

322305 For the octahedral complexes of \(\mathrm{Fe}^{3+}\) in \(\mathrm{SCN}^{-}\) (thiocyanate - \(\mathrm{S}\) ) and in \(\mathrm{CN}^{-}\)ligand environments, the difference between the spin only magnetic moments (in B. M) is

1 4
2 3
3 7
4 8
CHXII09:COORDINATION COMPOUNDS

322306 Statement A :
Both \({\mathrm{\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}}}\) and
\({\mathrm{\left[\mathrm{CoF}_{6}\right]^{3-}}}\) complexes are octahedral but differ in their magnetic behaviour.
Statement B :
\({\mathrm{\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}}}\) is diamagnetic
whereas \({\mathrm{\left[\mathrm{CoF}_{6}\right]^{3-}}}\) is paramagnetic.
choose the correct answer from the options given below:

1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both statements are correct.
4 Both Statements are incorrect.
NEET - 2024
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CHXII09:COORDINATION COMPOUNDS

322303 \({\text{B}}{{\text{a}}^{{\text{2 + }}}}{\text{,C}}{{\text{N}}^{\text{ - }}}{\text{ & C}}{{\text{o}}^{{\text{2 + }}}}\) ions form an ionic complex. If this complex is \(75 \%\) ionised in aqueous solution with van't Hoff factor equal to 4 and \(\mu\) \((\) magnetic moment \()=1.73\) B.M. Then, the possible hybridisation of cobalt in the complex is

1 \(\mathrm{sp}^{3} \mathrm{~d}\)
2 \({{\text{d}}^{\text{2}}}{{\text{s}}^{\text{3}}}\)
3 \(\mathrm{sp}^{3} \mathrm{~d}^{2}\)
4 \(\mathrm{dsp}^{3}\)
CHXII09:COORDINATION COMPOUNDS

322304 The hybridisation and magnetic behaviour of cobalt ion in \(\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}\) complex, respectively is

1 \(\mathrm{sp}^{3} \mathrm{~d}^{2}\) and paramagnetic
2 \(\mathrm{sp}^{3} \mathrm{~d}^{2}\) and diamagnetic.
3 \(\mathrm{d}^{2} \mathrm{sp}^{3}\) and diamagnetic
4 \({{\rm{d}}^2}{\rm{s}}{{\rm{p}}^3}\) and paramagnetic
JEE - 2023
CHXII09:COORDINATION COMPOUNDS

322305 For the octahedral complexes of \(\mathrm{Fe}^{3+}\) in \(\mathrm{SCN}^{-}\) (thiocyanate - \(\mathrm{S}\) ) and in \(\mathrm{CN}^{-}\)ligand environments, the difference between the spin only magnetic moments (in B. M) is

1 4
2 3
3 7
4 8
CHXII09:COORDINATION COMPOUNDS

322306 Statement A :
Both \({\mathrm{\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}}}\) and
\({\mathrm{\left[\mathrm{CoF}_{6}\right]^{3-}}}\) complexes are octahedral but differ in their magnetic behaviour.
Statement B :
\({\mathrm{\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}}}\) is diamagnetic
whereas \({\mathrm{\left[\mathrm{CoF}_{6}\right]^{3-}}}\) is paramagnetic.
choose the correct answer from the options given below:

1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both statements are correct.
4 Both Statements are incorrect.
NEET - 2024
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CHXII09:COORDINATION COMPOUNDS

322303 \({\text{B}}{{\text{a}}^{{\text{2 + }}}}{\text{,C}}{{\text{N}}^{\text{ - }}}{\text{ & C}}{{\text{o}}^{{\text{2 + }}}}\) ions form an ionic complex. If this complex is \(75 \%\) ionised in aqueous solution with van't Hoff factor equal to 4 and \(\mu\) \((\) magnetic moment \()=1.73\) B.M. Then, the possible hybridisation of cobalt in the complex is

1 \(\mathrm{sp}^{3} \mathrm{~d}\)
2 \({{\text{d}}^{\text{2}}}{{\text{s}}^{\text{3}}}\)
3 \(\mathrm{sp}^{3} \mathrm{~d}^{2}\)
4 \(\mathrm{dsp}^{3}\)
CHXII09:COORDINATION COMPOUNDS

322304 The hybridisation and magnetic behaviour of cobalt ion in \(\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}\) complex, respectively is

1 \(\mathrm{sp}^{3} \mathrm{~d}^{2}\) and paramagnetic
2 \(\mathrm{sp}^{3} \mathrm{~d}^{2}\) and diamagnetic.
3 \(\mathrm{d}^{2} \mathrm{sp}^{3}\) and diamagnetic
4 \({{\rm{d}}^2}{\rm{s}}{{\rm{p}}^3}\) and paramagnetic
JEE - 2023
CHXII09:COORDINATION COMPOUNDS

322305 For the octahedral complexes of \(\mathrm{Fe}^{3+}\) in \(\mathrm{SCN}^{-}\) (thiocyanate - \(\mathrm{S}\) ) and in \(\mathrm{CN}^{-}\)ligand environments, the difference between the spin only magnetic moments (in B. M) is

1 4
2 3
3 7
4 8
CHXII09:COORDINATION COMPOUNDS

322306 Statement A :
Both \({\mathrm{\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}}}\) and
\({\mathrm{\left[\mathrm{CoF}_{6}\right]^{3-}}}\) complexes are octahedral but differ in their magnetic behaviour.
Statement B :
\({\mathrm{\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}}}\) is diamagnetic
whereas \({\mathrm{\left[\mathrm{CoF}_{6}\right]^{3-}}}\) is paramagnetic.
choose the correct answer from the options given below:

1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both statements are correct.
4 Both Statements are incorrect.
NEET - 2024
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CHXII09:COORDINATION COMPOUNDS

322303 \({\text{B}}{{\text{a}}^{{\text{2 + }}}}{\text{,C}}{{\text{N}}^{\text{ - }}}{\text{ & C}}{{\text{o}}^{{\text{2 + }}}}\) ions form an ionic complex. If this complex is \(75 \%\) ionised in aqueous solution with van't Hoff factor equal to 4 and \(\mu\) \((\) magnetic moment \()=1.73\) B.M. Then, the possible hybridisation of cobalt in the complex is

1 \(\mathrm{sp}^{3} \mathrm{~d}\)
2 \({{\text{d}}^{\text{2}}}{{\text{s}}^{\text{3}}}\)
3 \(\mathrm{sp}^{3} \mathrm{~d}^{2}\)
4 \(\mathrm{dsp}^{3}\)
CHXII09:COORDINATION COMPOUNDS

322304 The hybridisation and magnetic behaviour of cobalt ion in \(\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}\) complex, respectively is

1 \(\mathrm{sp}^{3} \mathrm{~d}^{2}\) and paramagnetic
2 \(\mathrm{sp}^{3} \mathrm{~d}^{2}\) and diamagnetic.
3 \(\mathrm{d}^{2} \mathrm{sp}^{3}\) and diamagnetic
4 \({{\rm{d}}^2}{\rm{s}}{{\rm{p}}^3}\) and paramagnetic
JEE - 2023
CHXII09:COORDINATION COMPOUNDS

322305 For the octahedral complexes of \(\mathrm{Fe}^{3+}\) in \(\mathrm{SCN}^{-}\) (thiocyanate - \(\mathrm{S}\) ) and in \(\mathrm{CN}^{-}\)ligand environments, the difference between the spin only magnetic moments (in B. M) is

1 4
2 3
3 7
4 8
CHXII09:COORDINATION COMPOUNDS

322306 Statement A :
Both \({\mathrm{\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}}}\) and
\({\mathrm{\left[\mathrm{CoF}_{6}\right]^{3-}}}\) complexes are octahedral but differ in their magnetic behaviour.
Statement B :
\({\mathrm{\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}}}\) is diamagnetic
whereas \({\mathrm{\left[\mathrm{CoF}_{6}\right]^{3-}}}\) is paramagnetic.
choose the correct answer from the options given below:

1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both statements are correct.
4 Both Statements are incorrect.
NEET - 2024