Colour in Coordination Compounds
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CHXII09:COORDINATION COMPOUNDS

321806 Which of the following statement is not true for the reaction given below?
\(\left[\mathrm{Cu}\left(\mathrm{H}_{2} \mathrm{O}\right)_{4}\right]^{2+}+4 \mathrm{NH}_{3} \rightleftharpoons\left[\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4}\right]^{2+}+4 \mathrm{H}_{2} \mathrm{O}\)

1 It is a ligand substitution reaction
2 \(\mathrm{NH}_{3}\) is a ralatively strong field ligand while \(\mathrm{H}_{2} \mathrm{O}\) is weak field ligand
3 During the reaction, there is a change in colour from light blue to dark blue
4 \(\left[\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4}\right]^{2+}\), has a tetrahedral structure and is paramagnetic
CHXII09:COORDINATION COMPOUNDS

321807 Out of \(\mathrm{TiF}_{6}^{2-}, \mathrm{CoF}_{6}^{3-}, \mathrm{Cu}_{2} \mathrm{Cl}_{2}\) and \(\mathrm{NiCl}_{4}^{2-}\) \((\mathrm{Z}\) of \(\mathrm{Ti}=22, \mathrm{Co}=27, \mathrm{Cu}=29, \mathrm{Ni}=28)\) the colourless species are

1 \(\mathrm{Cu}_{2} \mathrm{Cl}_{2}\) and \(\mathrm{NiCl}_{4}^{2-}\)
2 \(\mathrm{TiF}_{6}^{2-}\) and \(\mathrm{Cu}_{2} \mathrm{Cl}_{2}\)
3 \(\mathrm{CoF}_{6}^{3-}\) and \(\mathrm{NiCl}_{4}^{2-}\)
4 \(\mathrm{TiF}_{6}^{2-}\) and \(\mathrm{CoF}_{6}^{3-}\)
CHXII09:COORDINATION COMPOUNDS

321808 Which of the following complex ions is expected to absorb visible light? (At. No. \(\mathrm{Zn}=30, \mathrm{Sc}=\) \(21, \mathrm{Ti}=22, \mathrm{Cr}=24)\)

1 \(\left[\mathrm{Sc}\left(\mathrm{H}_{2} \mathrm{O}\right)_{3}\left(\mathrm{NH}_{3}\right)_{3}\right]^{3+}\)
2 \(\left[\mathrm{Ti}(\text { en })_{2}\left(\mathrm{NH}_{3}\right)_{2}\right]^{4+}\)
3 \(\left[\mathrm{Cr}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}\)
4 \(\left[\mathrm{Zn}\left(\mathrm{NH}_{3}\right)_{6}\right]^{2+}\)
CHXII09:COORDINATION COMPOUNDS

321809 Statement A :
\(\left[\mathrm{Ti}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+}\) is coloured while \(\left[\mathrm{Sc}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+}\) is colourless.
Statement B :
d-d transition is not possible in \(\left[\mathrm{Sc}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+}\).

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.
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CHXII09:COORDINATION COMPOUNDS

321806 Which of the following statement is not true for the reaction given below?
\(\left[\mathrm{Cu}\left(\mathrm{H}_{2} \mathrm{O}\right)_{4}\right]^{2+}+4 \mathrm{NH}_{3} \rightleftharpoons\left[\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4}\right]^{2+}+4 \mathrm{H}_{2} \mathrm{O}\)

1 It is a ligand substitution reaction
2 \(\mathrm{NH}_{3}\) is a ralatively strong field ligand while \(\mathrm{H}_{2} \mathrm{O}\) is weak field ligand
3 During the reaction, there is a change in colour from light blue to dark blue
4 \(\left[\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4}\right]^{2+}\), has a tetrahedral structure and is paramagnetic
CHXII09:COORDINATION COMPOUNDS

321807 Out of \(\mathrm{TiF}_{6}^{2-}, \mathrm{CoF}_{6}^{3-}, \mathrm{Cu}_{2} \mathrm{Cl}_{2}\) and \(\mathrm{NiCl}_{4}^{2-}\) \((\mathrm{Z}\) of \(\mathrm{Ti}=22, \mathrm{Co}=27, \mathrm{Cu}=29, \mathrm{Ni}=28)\) the colourless species are

1 \(\mathrm{Cu}_{2} \mathrm{Cl}_{2}\) and \(\mathrm{NiCl}_{4}^{2-}\)
2 \(\mathrm{TiF}_{6}^{2-}\) and \(\mathrm{Cu}_{2} \mathrm{Cl}_{2}\)
3 \(\mathrm{CoF}_{6}^{3-}\) and \(\mathrm{NiCl}_{4}^{2-}\)
4 \(\mathrm{TiF}_{6}^{2-}\) and \(\mathrm{CoF}_{6}^{3-}\)
CHXII09:COORDINATION COMPOUNDS

321808 Which of the following complex ions is expected to absorb visible light? (At. No. \(\mathrm{Zn}=30, \mathrm{Sc}=\) \(21, \mathrm{Ti}=22, \mathrm{Cr}=24)\)

1 \(\left[\mathrm{Sc}\left(\mathrm{H}_{2} \mathrm{O}\right)_{3}\left(\mathrm{NH}_{3}\right)_{3}\right]^{3+}\)
2 \(\left[\mathrm{Ti}(\text { en })_{2}\left(\mathrm{NH}_{3}\right)_{2}\right]^{4+}\)
3 \(\left[\mathrm{Cr}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}\)
4 \(\left[\mathrm{Zn}\left(\mathrm{NH}_{3}\right)_{6}\right]^{2+}\)
CHXII09:COORDINATION COMPOUNDS

321809 Statement A :
\(\left[\mathrm{Ti}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+}\) is coloured while \(\left[\mathrm{Sc}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+}\) is colourless.
Statement B :
d-d transition is not possible in \(\left[\mathrm{Sc}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+}\).

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.
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CHXII09:COORDINATION COMPOUNDS

321806 Which of the following statement is not true for the reaction given below?
\(\left[\mathrm{Cu}\left(\mathrm{H}_{2} \mathrm{O}\right)_{4}\right]^{2+}+4 \mathrm{NH}_{3} \rightleftharpoons\left[\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4}\right]^{2+}+4 \mathrm{H}_{2} \mathrm{O}\)

1 It is a ligand substitution reaction
2 \(\mathrm{NH}_{3}\) is a ralatively strong field ligand while \(\mathrm{H}_{2} \mathrm{O}\) is weak field ligand
3 During the reaction, there is a change in colour from light blue to dark blue
4 \(\left[\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4}\right]^{2+}\), has a tetrahedral structure and is paramagnetic
CHXII09:COORDINATION COMPOUNDS

321807 Out of \(\mathrm{TiF}_{6}^{2-}, \mathrm{CoF}_{6}^{3-}, \mathrm{Cu}_{2} \mathrm{Cl}_{2}\) and \(\mathrm{NiCl}_{4}^{2-}\) \((\mathrm{Z}\) of \(\mathrm{Ti}=22, \mathrm{Co}=27, \mathrm{Cu}=29, \mathrm{Ni}=28)\) the colourless species are

1 \(\mathrm{Cu}_{2} \mathrm{Cl}_{2}\) and \(\mathrm{NiCl}_{4}^{2-}\)
2 \(\mathrm{TiF}_{6}^{2-}\) and \(\mathrm{Cu}_{2} \mathrm{Cl}_{2}\)
3 \(\mathrm{CoF}_{6}^{3-}\) and \(\mathrm{NiCl}_{4}^{2-}\)
4 \(\mathrm{TiF}_{6}^{2-}\) and \(\mathrm{CoF}_{6}^{3-}\)
CHXII09:COORDINATION COMPOUNDS

321808 Which of the following complex ions is expected to absorb visible light? (At. No. \(\mathrm{Zn}=30, \mathrm{Sc}=\) \(21, \mathrm{Ti}=22, \mathrm{Cr}=24)\)

1 \(\left[\mathrm{Sc}\left(\mathrm{H}_{2} \mathrm{O}\right)_{3}\left(\mathrm{NH}_{3}\right)_{3}\right]^{3+}\)
2 \(\left[\mathrm{Ti}(\text { en })_{2}\left(\mathrm{NH}_{3}\right)_{2}\right]^{4+}\)
3 \(\left[\mathrm{Cr}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}\)
4 \(\left[\mathrm{Zn}\left(\mathrm{NH}_{3}\right)_{6}\right]^{2+}\)
CHXII09:COORDINATION COMPOUNDS

321809 Statement A :
\(\left[\mathrm{Ti}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+}\) is coloured while \(\left[\mathrm{Sc}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+}\) is colourless.
Statement B :
d-d transition is not possible in \(\left[\mathrm{Sc}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+}\).

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.
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CHXII09:COORDINATION COMPOUNDS

321806 Which of the following statement is not true for the reaction given below?
\(\left[\mathrm{Cu}\left(\mathrm{H}_{2} \mathrm{O}\right)_{4}\right]^{2+}+4 \mathrm{NH}_{3} \rightleftharpoons\left[\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4}\right]^{2+}+4 \mathrm{H}_{2} \mathrm{O}\)

1 It is a ligand substitution reaction
2 \(\mathrm{NH}_{3}\) is a ralatively strong field ligand while \(\mathrm{H}_{2} \mathrm{O}\) is weak field ligand
3 During the reaction, there is a change in colour from light blue to dark blue
4 \(\left[\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4}\right]^{2+}\), has a tetrahedral structure and is paramagnetic
CHXII09:COORDINATION COMPOUNDS

321807 Out of \(\mathrm{TiF}_{6}^{2-}, \mathrm{CoF}_{6}^{3-}, \mathrm{Cu}_{2} \mathrm{Cl}_{2}\) and \(\mathrm{NiCl}_{4}^{2-}\) \((\mathrm{Z}\) of \(\mathrm{Ti}=22, \mathrm{Co}=27, \mathrm{Cu}=29, \mathrm{Ni}=28)\) the colourless species are

1 \(\mathrm{Cu}_{2} \mathrm{Cl}_{2}\) and \(\mathrm{NiCl}_{4}^{2-}\)
2 \(\mathrm{TiF}_{6}^{2-}\) and \(\mathrm{Cu}_{2} \mathrm{Cl}_{2}\)
3 \(\mathrm{CoF}_{6}^{3-}\) and \(\mathrm{NiCl}_{4}^{2-}\)
4 \(\mathrm{TiF}_{6}^{2-}\) and \(\mathrm{CoF}_{6}^{3-}\)
CHXII09:COORDINATION COMPOUNDS

321808 Which of the following complex ions is expected to absorb visible light? (At. No. \(\mathrm{Zn}=30, \mathrm{Sc}=\) \(21, \mathrm{Ti}=22, \mathrm{Cr}=24)\)

1 \(\left[\mathrm{Sc}\left(\mathrm{H}_{2} \mathrm{O}\right)_{3}\left(\mathrm{NH}_{3}\right)_{3}\right]^{3+}\)
2 \(\left[\mathrm{Ti}(\text { en })_{2}\left(\mathrm{NH}_{3}\right)_{2}\right]^{4+}\)
3 \(\left[\mathrm{Cr}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}\)
4 \(\left[\mathrm{Zn}\left(\mathrm{NH}_{3}\right)_{6}\right]^{2+}\)
CHXII09:COORDINATION COMPOUNDS

321809 Statement A :
\(\left[\mathrm{Ti}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+}\) is coloured while \(\left[\mathrm{Sc}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+}\) is colourless.
Statement B :
d-d transition is not possible in \(\left[\mathrm{Sc}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+}\).

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.
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