Colour in Coordination Compounds
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CHXII09:COORDINATION COMPOUNDS

321789 An ammoniacal metal salt solution gives a brilliant red precipitate on addition of dimethylglyoxime. The metal ion is

1 \(\mathrm{Fe}^{2+}\)
2 \(\mathrm{Co}^{2+}\)
3 \(\mathrm{Ni}^{2+}\)
4 \(\mathrm{Cu}^{2+}\)
JEE - 2023
CHXII09:COORDINATION COMPOUNDS

321790 The octahedral complex of a metal ion \({{\text{M}}^{{\text{3 + }}}}\) with four monodentate ligands \({{\text{L}}_{\text{1}}}{\text{,}}{{\text{L}}_{\text{2}}}{\text{,}}{{\text{L}}_{\text{3}}}\) and \({{\text{L}}_{\text{4}}}\) absorbs wavelengths in the region of red, green, yellow and blue respectively. The increasing order of ligand strength of the four ligands is:

1 \({{\text{L}}_{\text{3}}}{\text{ < }}{{\text{L}}_{\text{2}}}{\text{ < }}{{\text{L}}_{\text{4}}}{\text{ < }}{{\text{L}}_{\text{1}}}\)
2 \({{\text{L}}_{\text{4}}}{\text{ < }}{{\text{L}}_{\text{3}}}{\text{ < }}{{\text{L}}_{\text{2}}}{\text{ < }}{{\text{L}}_{\text{1}}}\)
3 \({{\text{L}}_{\text{1}}}{\text{ < }}{{\text{L}}_{\text{3}}}{\text{ < }}{{\text{L}}_{\text{2}}}{\text{ < }}{{\text{L}}_{\text{4}}}\)
4 \({{\text{L}}_{\text{1}}}{\text{ < }}{{\text{L}}_{\text{2}}}{\text{ < }}{{\text{L}}_{\text{4}}}{\text{ < }}{{\text{L}}_{\text{3}}}\)
CHXII09:COORDINATION COMPOUNDS

321791 Which of the following compounds is not coloured?

1 \(\mathrm{Na}_{2}\left[\mathrm{CuCl}_{4}\right]\)
2 \(\mathrm{Na}\left[\mathrm{CdCl}_{4}\right]\)
3 \(\mathrm{K}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]\)
4 \(\mathrm{K}_{3}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]\)
CHXII09:COORDINATION COMPOUNDS

321792 A solution of \(\left[\mathrm{Ni}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}\) is green but a solution of \(\left[\mathrm{Ni}(\mathrm{CN})_{4}\right]^{2-}\) is colourless. Explain.

1 \(\mathrm{Ni}^{2+}\) with \(\mathrm{H}_{2} \mathrm{O}\) has \(\mathrm{d}^{8}\) and undergoes \(\mathrm{sp}^{3} \mathrm{~d}^{2}\) hybridisation with 2 unpaired electrons
2 \(\mathrm{Ni}^{2+}\) with \(\mathrm{CN}^{-}\)has \(\mathrm{d}^{8}\) and undergoes \(\mathrm{dsp}^{2}\) hybridisation with no unpaired electrons.
3 \(\mathrm{Ni}^{2+}\) has \(\mathrm{d}^{8}\) and undergoes \(\mathrm{sp}^{3}\) dhybridisation with no unpaired electrons.
4 Both (1) and (2)
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CHXII09:COORDINATION COMPOUNDS

321789 An ammoniacal metal salt solution gives a brilliant red precipitate on addition of dimethylglyoxime. The metal ion is

1 \(\mathrm{Fe}^{2+}\)
2 \(\mathrm{Co}^{2+}\)
3 \(\mathrm{Ni}^{2+}\)
4 \(\mathrm{Cu}^{2+}\)
JEE - 2023
CHXII09:COORDINATION COMPOUNDS

321790 The octahedral complex of a metal ion \({{\text{M}}^{{\text{3 + }}}}\) with four monodentate ligands \({{\text{L}}_{\text{1}}}{\text{,}}{{\text{L}}_{\text{2}}}{\text{,}}{{\text{L}}_{\text{3}}}\) and \({{\text{L}}_{\text{4}}}\) absorbs wavelengths in the region of red, green, yellow and blue respectively. The increasing order of ligand strength of the four ligands is:

1 \({{\text{L}}_{\text{3}}}{\text{ < }}{{\text{L}}_{\text{2}}}{\text{ < }}{{\text{L}}_{\text{4}}}{\text{ < }}{{\text{L}}_{\text{1}}}\)
2 \({{\text{L}}_{\text{4}}}{\text{ < }}{{\text{L}}_{\text{3}}}{\text{ < }}{{\text{L}}_{\text{2}}}{\text{ < }}{{\text{L}}_{\text{1}}}\)
3 \({{\text{L}}_{\text{1}}}{\text{ < }}{{\text{L}}_{\text{3}}}{\text{ < }}{{\text{L}}_{\text{2}}}{\text{ < }}{{\text{L}}_{\text{4}}}\)
4 \({{\text{L}}_{\text{1}}}{\text{ < }}{{\text{L}}_{\text{2}}}{\text{ < }}{{\text{L}}_{\text{4}}}{\text{ < }}{{\text{L}}_{\text{3}}}\)
CHXII09:COORDINATION COMPOUNDS

321791 Which of the following compounds is not coloured?

1 \(\mathrm{Na}_{2}\left[\mathrm{CuCl}_{4}\right]\)
2 \(\mathrm{Na}\left[\mathrm{CdCl}_{4}\right]\)
3 \(\mathrm{K}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]\)
4 \(\mathrm{K}_{3}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]\)
CHXII09:COORDINATION COMPOUNDS

321792 A solution of \(\left[\mathrm{Ni}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}\) is green but a solution of \(\left[\mathrm{Ni}(\mathrm{CN})_{4}\right]^{2-}\) is colourless. Explain.

1 \(\mathrm{Ni}^{2+}\) with \(\mathrm{H}_{2} \mathrm{O}\) has \(\mathrm{d}^{8}\) and undergoes \(\mathrm{sp}^{3} \mathrm{~d}^{2}\) hybridisation with 2 unpaired electrons
2 \(\mathrm{Ni}^{2+}\) with \(\mathrm{CN}^{-}\)has \(\mathrm{d}^{8}\) and undergoes \(\mathrm{dsp}^{2}\) hybridisation with no unpaired electrons.
3 \(\mathrm{Ni}^{2+}\) has \(\mathrm{d}^{8}\) and undergoes \(\mathrm{sp}^{3}\) dhybridisation with no unpaired electrons.
4 Both (1) and (2)
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CHXII09:COORDINATION COMPOUNDS

321789 An ammoniacal metal salt solution gives a brilliant red precipitate on addition of dimethylglyoxime. The metal ion is

1 \(\mathrm{Fe}^{2+}\)
2 \(\mathrm{Co}^{2+}\)
3 \(\mathrm{Ni}^{2+}\)
4 \(\mathrm{Cu}^{2+}\)
JEE - 2023
CHXII09:COORDINATION COMPOUNDS

321790 The octahedral complex of a metal ion \({{\text{M}}^{{\text{3 + }}}}\) with four monodentate ligands \({{\text{L}}_{\text{1}}}{\text{,}}{{\text{L}}_{\text{2}}}{\text{,}}{{\text{L}}_{\text{3}}}\) and \({{\text{L}}_{\text{4}}}\) absorbs wavelengths in the region of red, green, yellow and blue respectively. The increasing order of ligand strength of the four ligands is:

1 \({{\text{L}}_{\text{3}}}{\text{ < }}{{\text{L}}_{\text{2}}}{\text{ < }}{{\text{L}}_{\text{4}}}{\text{ < }}{{\text{L}}_{\text{1}}}\)
2 \({{\text{L}}_{\text{4}}}{\text{ < }}{{\text{L}}_{\text{3}}}{\text{ < }}{{\text{L}}_{\text{2}}}{\text{ < }}{{\text{L}}_{\text{1}}}\)
3 \({{\text{L}}_{\text{1}}}{\text{ < }}{{\text{L}}_{\text{3}}}{\text{ < }}{{\text{L}}_{\text{2}}}{\text{ < }}{{\text{L}}_{\text{4}}}\)
4 \({{\text{L}}_{\text{1}}}{\text{ < }}{{\text{L}}_{\text{2}}}{\text{ < }}{{\text{L}}_{\text{4}}}{\text{ < }}{{\text{L}}_{\text{3}}}\)
CHXII09:COORDINATION COMPOUNDS

321791 Which of the following compounds is not coloured?

1 \(\mathrm{Na}_{2}\left[\mathrm{CuCl}_{4}\right]\)
2 \(\mathrm{Na}\left[\mathrm{CdCl}_{4}\right]\)
3 \(\mathrm{K}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]\)
4 \(\mathrm{K}_{3}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]\)
CHXII09:COORDINATION COMPOUNDS

321792 A solution of \(\left[\mathrm{Ni}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}\) is green but a solution of \(\left[\mathrm{Ni}(\mathrm{CN})_{4}\right]^{2-}\) is colourless. Explain.

1 \(\mathrm{Ni}^{2+}\) with \(\mathrm{H}_{2} \mathrm{O}\) has \(\mathrm{d}^{8}\) and undergoes \(\mathrm{sp}^{3} \mathrm{~d}^{2}\) hybridisation with 2 unpaired electrons
2 \(\mathrm{Ni}^{2+}\) with \(\mathrm{CN}^{-}\)has \(\mathrm{d}^{8}\) and undergoes \(\mathrm{dsp}^{2}\) hybridisation with no unpaired electrons.
3 \(\mathrm{Ni}^{2+}\) has \(\mathrm{d}^{8}\) and undergoes \(\mathrm{sp}^{3}\) dhybridisation with no unpaired electrons.
4 Both (1) and (2)
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CHXII09:COORDINATION COMPOUNDS

321789 An ammoniacal metal salt solution gives a brilliant red precipitate on addition of dimethylglyoxime. The metal ion is

1 \(\mathrm{Fe}^{2+}\)
2 \(\mathrm{Co}^{2+}\)
3 \(\mathrm{Ni}^{2+}\)
4 \(\mathrm{Cu}^{2+}\)
JEE - 2023
CHXII09:COORDINATION COMPOUNDS

321790 The octahedral complex of a metal ion \({{\text{M}}^{{\text{3 + }}}}\) with four monodentate ligands \({{\text{L}}_{\text{1}}}{\text{,}}{{\text{L}}_{\text{2}}}{\text{,}}{{\text{L}}_{\text{3}}}\) and \({{\text{L}}_{\text{4}}}\) absorbs wavelengths in the region of red, green, yellow and blue respectively. The increasing order of ligand strength of the four ligands is:

1 \({{\text{L}}_{\text{3}}}{\text{ < }}{{\text{L}}_{\text{2}}}{\text{ < }}{{\text{L}}_{\text{4}}}{\text{ < }}{{\text{L}}_{\text{1}}}\)
2 \({{\text{L}}_{\text{4}}}{\text{ < }}{{\text{L}}_{\text{3}}}{\text{ < }}{{\text{L}}_{\text{2}}}{\text{ < }}{{\text{L}}_{\text{1}}}\)
3 \({{\text{L}}_{\text{1}}}{\text{ < }}{{\text{L}}_{\text{3}}}{\text{ < }}{{\text{L}}_{\text{2}}}{\text{ < }}{{\text{L}}_{\text{4}}}\)
4 \({{\text{L}}_{\text{1}}}{\text{ < }}{{\text{L}}_{\text{2}}}{\text{ < }}{{\text{L}}_{\text{4}}}{\text{ < }}{{\text{L}}_{\text{3}}}\)
CHXII09:COORDINATION COMPOUNDS

321791 Which of the following compounds is not coloured?

1 \(\mathrm{Na}_{2}\left[\mathrm{CuCl}_{4}\right]\)
2 \(\mathrm{Na}\left[\mathrm{CdCl}_{4}\right]\)
3 \(\mathrm{K}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]\)
4 \(\mathrm{K}_{3}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]\)
CHXII09:COORDINATION COMPOUNDS

321792 A solution of \(\left[\mathrm{Ni}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}\) is green but a solution of \(\left[\mathrm{Ni}(\mathrm{CN})_{4}\right]^{2-}\) is colourless. Explain.

1 \(\mathrm{Ni}^{2+}\) with \(\mathrm{H}_{2} \mathrm{O}\) has \(\mathrm{d}^{8}\) and undergoes \(\mathrm{sp}^{3} \mathrm{~d}^{2}\) hybridisation with 2 unpaired electrons
2 \(\mathrm{Ni}^{2+}\) with \(\mathrm{CN}^{-}\)has \(\mathrm{d}^{8}\) and undergoes \(\mathrm{dsp}^{2}\) hybridisation with no unpaired electrons.
3 \(\mathrm{Ni}^{2+}\) has \(\mathrm{d}^{8}\) and undergoes \(\mathrm{sp}^{3}\) dhybridisation with no unpaired electrons.
4 Both (1) and (2)
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