04. Spectrochemical Series, Complex Stability
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COORDINATION COMPOUNDS

274177 The correct order for wavelengths of light absorbed in the complex ions $\left[\mathrm{CoCl}\left(\mathrm{NH}_{3}\right)_{5}\right]^{2+},\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}$ and $\left[\mathrm{Co}(\mathrm{CN})_{6}\right]^{3-}$ is

1 $\left[\mathrm{CoCl}\left(\mathrm{NH}_{3}\right)_{5}\right]^{2+}>\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}>\left[\mathrm{Co}(\mathrm{CN})_{6}\right]^{3-}$
2 $\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}>\left[\mathrm{Co}(\mathrm{CN})_{6}\right]^{3-}>\left[\mathrm{CoCl}\left(\mathrm{NH}_{3}\right)_{5}\right]^{2+}$
3 $\left[\mathrm{Co}(\mathrm{CN})_{6}\right]^{3-}>\left[\mathrm{CoCl}\left(\mathrm{CN}_{3}\right)_{5}\right]^{2+}>\left[\mathrm{Co}(\mathrm{CN})_{6}\right]^{3-}$
4 $\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}>\left[\mathrm{CoCl}\left(\mathrm{NH}_{3}\right)_{5}\right]^{2+}>\left[\mathrm{Co}(\mathrm{CN})_{6}\right]^{3-}$
Karnataka-CET-2021
COORDINATION COMPOUNDS

274166 The correct order about the number of unpaired electrons present in the following complexes is
$\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{4-} \quad\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+} \quad\left[\mathrm{Co}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}$

1 I $>$ II $>$ III
2 III $>$ II $>$ I
3 II $>$ III $>$ III
4 II $>$ I $>$ III
AP EAMCET-06.07.2022
COORDINATION COMPOUNDS

274167 An element ' $X$ ' with atomic number 13 forms a complex of the type $\left[\mathrm{XCl}\left(\mathrm{H}_{2} \mathrm{O}\right)_{5}\right]^{2-}$. The covalency and oxidation state of $X$ in it are respectively

1 $5,+2$
2 $6,+2$
3 $5,+3$
4 $6,+3$
AP EAMCET-05.07.2022
COORDINATION COMPOUNDS

274170 The most stable ion is

1 $\left[\mathrm{Fe}(\mathrm{OH})_{3}\right]^{3-}$
2 $\left[\mathrm{FeCl}_{6}\right]^{3-}$
3 $\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{3-}$
4 $\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+}$
BITSAT-2011
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COORDINATION COMPOUNDS

274177 The correct order for wavelengths of light absorbed in the complex ions $\left[\mathrm{CoCl}\left(\mathrm{NH}_{3}\right)_{5}\right]^{2+},\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}$ and $\left[\mathrm{Co}(\mathrm{CN})_{6}\right]^{3-}$ is

1 $\left[\mathrm{CoCl}\left(\mathrm{NH}_{3}\right)_{5}\right]^{2+}>\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}>\left[\mathrm{Co}(\mathrm{CN})_{6}\right]^{3-}$
2 $\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}>\left[\mathrm{Co}(\mathrm{CN})_{6}\right]^{3-}>\left[\mathrm{CoCl}\left(\mathrm{NH}_{3}\right)_{5}\right]^{2+}$
3 $\left[\mathrm{Co}(\mathrm{CN})_{6}\right]^{3-}>\left[\mathrm{CoCl}\left(\mathrm{CN}_{3}\right)_{5}\right]^{2+}>\left[\mathrm{Co}(\mathrm{CN})_{6}\right]^{3-}$
4 $\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}>\left[\mathrm{CoCl}\left(\mathrm{NH}_{3}\right)_{5}\right]^{2+}>\left[\mathrm{Co}(\mathrm{CN})_{6}\right]^{3-}$
Karnataka-CET-2021
COORDINATION COMPOUNDS

274166 The correct order about the number of unpaired electrons present in the following complexes is
$\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{4-} \quad\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+} \quad\left[\mathrm{Co}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}$

1 I $>$ II $>$ III
2 III $>$ II $>$ I
3 II $>$ III $>$ III
4 II $>$ I $>$ III
AP EAMCET-06.07.2022
COORDINATION COMPOUNDS

274167 An element ' $X$ ' with atomic number 13 forms a complex of the type $\left[\mathrm{XCl}\left(\mathrm{H}_{2} \mathrm{O}\right)_{5}\right]^{2-}$. The covalency and oxidation state of $X$ in it are respectively

1 $5,+2$
2 $6,+2$
3 $5,+3$
4 $6,+3$
AP EAMCET-05.07.2022
COORDINATION COMPOUNDS

274170 The most stable ion is

1 $\left[\mathrm{Fe}(\mathrm{OH})_{3}\right]^{3-}$
2 $\left[\mathrm{FeCl}_{6}\right]^{3-}$
3 $\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{3-}$
4 $\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+}$
BITSAT-2011
NEET DIGITAL LIBRARY
COORDINATION COMPOUNDS

274177 The correct order for wavelengths of light absorbed in the complex ions $\left[\mathrm{CoCl}\left(\mathrm{NH}_{3}\right)_{5}\right]^{2+},\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}$ and $\left[\mathrm{Co}(\mathrm{CN})_{6}\right]^{3-}$ is

1 $\left[\mathrm{CoCl}\left(\mathrm{NH}_{3}\right)_{5}\right]^{2+}>\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}>\left[\mathrm{Co}(\mathrm{CN})_{6}\right]^{3-}$
2 $\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}>\left[\mathrm{Co}(\mathrm{CN})_{6}\right]^{3-}>\left[\mathrm{CoCl}\left(\mathrm{NH}_{3}\right)_{5}\right]^{2+}$
3 $\left[\mathrm{Co}(\mathrm{CN})_{6}\right]^{3-}>\left[\mathrm{CoCl}\left(\mathrm{CN}_{3}\right)_{5}\right]^{2+}>\left[\mathrm{Co}(\mathrm{CN})_{6}\right]^{3-}$
4 $\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}>\left[\mathrm{CoCl}\left(\mathrm{NH}_{3}\right)_{5}\right]^{2+}>\left[\mathrm{Co}(\mathrm{CN})_{6}\right]^{3-}$
Karnataka-CET-2021
COORDINATION COMPOUNDS

274166 The correct order about the number of unpaired electrons present in the following complexes is
$\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{4-} \quad\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+} \quad\left[\mathrm{Co}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}$

1 I $>$ II $>$ III
2 III $>$ II $>$ I
3 II $>$ III $>$ III
4 II $>$ I $>$ III
AP EAMCET-06.07.2022
COORDINATION COMPOUNDS

274167 An element ' $X$ ' with atomic number 13 forms a complex of the type $\left[\mathrm{XCl}\left(\mathrm{H}_{2} \mathrm{O}\right)_{5}\right]^{2-}$. The covalency and oxidation state of $X$ in it are respectively

1 $5,+2$
2 $6,+2$
3 $5,+3$
4 $6,+3$
AP EAMCET-05.07.2022
COORDINATION COMPOUNDS

274170 The most stable ion is

1 $\left[\mathrm{Fe}(\mathrm{OH})_{3}\right]^{3-}$
2 $\left[\mathrm{FeCl}_{6}\right]^{3-}$
3 $\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{3-}$
4 $\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+}$
BITSAT-2011
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COORDINATION COMPOUNDS

274177 The correct order for wavelengths of light absorbed in the complex ions $\left[\mathrm{CoCl}\left(\mathrm{NH}_{3}\right)_{5}\right]^{2+},\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}$ and $\left[\mathrm{Co}(\mathrm{CN})_{6}\right]^{3-}$ is

1 $\left[\mathrm{CoCl}\left(\mathrm{NH}_{3}\right)_{5}\right]^{2+}>\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}>\left[\mathrm{Co}(\mathrm{CN})_{6}\right]^{3-}$
2 $\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}>\left[\mathrm{Co}(\mathrm{CN})_{6}\right]^{3-}>\left[\mathrm{CoCl}\left(\mathrm{NH}_{3}\right)_{5}\right]^{2+}$
3 $\left[\mathrm{Co}(\mathrm{CN})_{6}\right]^{3-}>\left[\mathrm{CoCl}\left(\mathrm{CN}_{3}\right)_{5}\right]^{2+}>\left[\mathrm{Co}(\mathrm{CN})_{6}\right]^{3-}$
4 $\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}>\left[\mathrm{CoCl}\left(\mathrm{NH}_{3}\right)_{5}\right]^{2+}>\left[\mathrm{Co}(\mathrm{CN})_{6}\right]^{3-}$
Karnataka-CET-2021
COORDINATION COMPOUNDS

274166 The correct order about the number of unpaired electrons present in the following complexes is
$\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{4-} \quad\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+} \quad\left[\mathrm{Co}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}$

1 I $>$ II $>$ III
2 III $>$ II $>$ I
3 II $>$ III $>$ III
4 II $>$ I $>$ III
AP EAMCET-06.07.2022
COORDINATION COMPOUNDS

274167 An element ' $X$ ' with atomic number 13 forms a complex of the type $\left[\mathrm{XCl}\left(\mathrm{H}_{2} \mathrm{O}\right)_{5}\right]^{2-}$. The covalency and oxidation state of $X$ in it are respectively

1 $5,+2$
2 $6,+2$
3 $5,+3$
4 $6,+3$
AP EAMCET-05.07.2022
COORDINATION COMPOUNDS

274170 The most stable ion is

1 $\left[\mathrm{Fe}(\mathrm{OH})_{3}\right]^{3-}$
2 $\left[\mathrm{FeCl}_{6}\right]^{3-}$
3 $\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{3-}$
4 $\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+}$
BITSAT-2011
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