Valence Bond Theory
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CHXII09:COORDINATION COMPOUNDS

322341 The d-electron configuration of \(\mathrm{Cr}^{2+}, \mathrm{Mn}^{2+}, \mathrm{Fe}^{2+}\) and \(\mathrm{Co}^{2+}\) are \({{\text{d}}^{\text{4}}}{\text{,}}{{\text{d}}^{\text{5}}}{\text{,}}{{\text{d}}^{\text{6}}}{\text{and}}\,{{\text{d}}^{\text{7}}}{\text{,}}\) respectively. Which one of the following will exhibit minimum paramagnetic behaviour?(At, nos. \(\mathrm{Cr}=24, \mathrm{Mn}=25, \mathrm{Fe}=26, \mathrm{Co}=27\) )

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

322342 Which of the following complexes exhibits the highest paramagnetic behaviour?
where gly \(=\) glycine, en \(=\) ethlyenediamine and bipy \(=\) bipyridyl (At. no. \(\mathrm{Ti}=22, \mathrm{~V}=23, \mathrm{Fe}=\) \(26, \mathrm{Co}=27\) )

1 \(\left[\mathrm{Ti}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}\)
2 \(\left[\mathrm{V}(\mathrm{gly})_{2}(\mathrm{OH})_{2}\left(\mathrm{NH}_{3}\right)_{2}\right]^{+}\)
3 \(\left[\mathrm{Fe}(\text { en })(\text { bipy })\left(\mathrm{NH}_{3}\right)_{2}\right]^{2+}\)
4 \(\left[\mathrm{Co}(\mathrm{ox})_{2}(\mathrm{OH})_{2}\right]\)
CHXII09:COORDINATION COMPOUNDS

322343 The spin magnetic moment of tetracyanonickelate (II) ion is (in B.M.)

1 2.82
2 1.732
3 4.9
4 0
CHXII09:COORDINATION COMPOUNDS

322344 Of the following complex ions, which is diamagnetic in nature?

1 \(\left[\mathrm{Ni}(\mathrm{CN})_{4}\right]^{2-}\)
2 \(\left[\mathrm{CuCl}_{4}\right]^{2-}\)
3 \(\left[\mathrm{CoF}_{6}\right]^{3-}\)
4 \(\left[\mathrm{NiCl}_{4}\right]^{2-}\)
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CHXII09:COORDINATION COMPOUNDS

322341 The d-electron configuration of \(\mathrm{Cr}^{2+}, \mathrm{Mn}^{2+}, \mathrm{Fe}^{2+}\) and \(\mathrm{Co}^{2+}\) are \({{\text{d}}^{\text{4}}}{\text{,}}{{\text{d}}^{\text{5}}}{\text{,}}{{\text{d}}^{\text{6}}}{\text{and}}\,{{\text{d}}^{\text{7}}}{\text{,}}\) respectively. Which one of the following will exhibit minimum paramagnetic behaviour?(At, nos. \(\mathrm{Cr}=24, \mathrm{Mn}=25, \mathrm{Fe}=26, \mathrm{Co}=27\) )

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

322342 Which of the following complexes exhibits the highest paramagnetic behaviour?
where gly \(=\) glycine, en \(=\) ethlyenediamine and bipy \(=\) bipyridyl (At. no. \(\mathrm{Ti}=22, \mathrm{~V}=23, \mathrm{Fe}=\) \(26, \mathrm{Co}=27\) )

1 \(\left[\mathrm{Ti}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}\)
2 \(\left[\mathrm{V}(\mathrm{gly})_{2}(\mathrm{OH})_{2}\left(\mathrm{NH}_{3}\right)_{2}\right]^{+}\)
3 \(\left[\mathrm{Fe}(\text { en })(\text { bipy })\left(\mathrm{NH}_{3}\right)_{2}\right]^{2+}\)
4 \(\left[\mathrm{Co}(\mathrm{ox})_{2}(\mathrm{OH})_{2}\right]\)
CHXII09:COORDINATION COMPOUNDS

322343 The spin magnetic moment of tetracyanonickelate (II) ion is (in B.M.)

1 2.82
2 1.732
3 4.9
4 0
CHXII09:COORDINATION COMPOUNDS

322344 Of the following complex ions, which is diamagnetic in nature?

1 \(\left[\mathrm{Ni}(\mathrm{CN})_{4}\right]^{2-}\)
2 \(\left[\mathrm{CuCl}_{4}\right]^{2-}\)
3 \(\left[\mathrm{CoF}_{6}\right]^{3-}\)
4 \(\left[\mathrm{NiCl}_{4}\right]^{2-}\)
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CHXII09:COORDINATION COMPOUNDS

322341 The d-electron configuration of \(\mathrm{Cr}^{2+}, \mathrm{Mn}^{2+}, \mathrm{Fe}^{2+}\) and \(\mathrm{Co}^{2+}\) are \({{\text{d}}^{\text{4}}}{\text{,}}{{\text{d}}^{\text{5}}}{\text{,}}{{\text{d}}^{\text{6}}}{\text{and}}\,{{\text{d}}^{\text{7}}}{\text{,}}\) respectively. Which one of the following will exhibit minimum paramagnetic behaviour?(At, nos. \(\mathrm{Cr}=24, \mathrm{Mn}=25, \mathrm{Fe}=26, \mathrm{Co}=27\) )

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

322342 Which of the following complexes exhibits the highest paramagnetic behaviour?
where gly \(=\) glycine, en \(=\) ethlyenediamine and bipy \(=\) bipyridyl (At. no. \(\mathrm{Ti}=22, \mathrm{~V}=23, \mathrm{Fe}=\) \(26, \mathrm{Co}=27\) )

1 \(\left[\mathrm{Ti}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}\)
2 \(\left[\mathrm{V}(\mathrm{gly})_{2}(\mathrm{OH})_{2}\left(\mathrm{NH}_{3}\right)_{2}\right]^{+}\)
3 \(\left[\mathrm{Fe}(\text { en })(\text { bipy })\left(\mathrm{NH}_{3}\right)_{2}\right]^{2+}\)
4 \(\left[\mathrm{Co}(\mathrm{ox})_{2}(\mathrm{OH})_{2}\right]\)
CHXII09:COORDINATION COMPOUNDS

322343 The spin magnetic moment of tetracyanonickelate (II) ion is (in B.M.)

1 2.82
2 1.732
3 4.9
4 0
CHXII09:COORDINATION COMPOUNDS

322344 Of the following complex ions, which is diamagnetic in nature?

1 \(\left[\mathrm{Ni}(\mathrm{CN})_{4}\right]^{2-}\)
2 \(\left[\mathrm{CuCl}_{4}\right]^{2-}\)
3 \(\left[\mathrm{CoF}_{6}\right]^{3-}\)
4 \(\left[\mathrm{NiCl}_{4}\right]^{2-}\)
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CHXII09:COORDINATION COMPOUNDS

322341 The d-electron configuration of \(\mathrm{Cr}^{2+}, \mathrm{Mn}^{2+}, \mathrm{Fe}^{2+}\) and \(\mathrm{Co}^{2+}\) are \({{\text{d}}^{\text{4}}}{\text{,}}{{\text{d}}^{\text{5}}}{\text{,}}{{\text{d}}^{\text{6}}}{\text{and}}\,{{\text{d}}^{\text{7}}}{\text{,}}\) respectively. Which one of the following will exhibit minimum paramagnetic behaviour?(At, nos. \(\mathrm{Cr}=24, \mathrm{Mn}=25, \mathrm{Fe}=26, \mathrm{Co}=27\) )

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

322342 Which of the following complexes exhibits the highest paramagnetic behaviour?
where gly \(=\) glycine, en \(=\) ethlyenediamine and bipy \(=\) bipyridyl (At. no. \(\mathrm{Ti}=22, \mathrm{~V}=23, \mathrm{Fe}=\) \(26, \mathrm{Co}=27\) )

1 \(\left[\mathrm{Ti}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}\)
2 \(\left[\mathrm{V}(\mathrm{gly})_{2}(\mathrm{OH})_{2}\left(\mathrm{NH}_{3}\right)_{2}\right]^{+}\)
3 \(\left[\mathrm{Fe}(\text { en })(\text { bipy })\left(\mathrm{NH}_{3}\right)_{2}\right]^{2+}\)
4 \(\left[\mathrm{Co}(\mathrm{ox})_{2}(\mathrm{OH})_{2}\right]\)
CHXII09:COORDINATION COMPOUNDS

322343 The spin magnetic moment of tetracyanonickelate (II) ion is (in B.M.)

1 2.82
2 1.732
3 4.9
4 0
CHXII09:COORDINATION COMPOUNDS

322344 Of the following complex ions, which is diamagnetic in nature?

1 \(\left[\mathrm{Ni}(\mathrm{CN})_{4}\right]^{2-}\)
2 \(\left[\mathrm{CuCl}_{4}\right]^{2-}\)
3 \(\left[\mathrm{CoF}_{6}\right]^{3-}\)
4 \(\left[\mathrm{NiCl}_{4}\right]^{2-}\)
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