07. Spectra and Colour of Co-ordination Compounds
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COORDINATION COMPOUNDS

274368 Amongst $\mathrm{TiF}_{6}^{2-}, \mathrm{CoF}_{6}^{3-}, \mathrm{Cu}_{2} \mathrm{Cl}_{2}$ and $\mathrm{NiCl}_{4}^{2-}$ (at. no. $\mathrm{Ti}=22, \mathrm{Co}=27, \mathrm{Cu}=29, \mathrm{Ni}=28$ ). The colourless species are

1 $\mathrm{CoF}_{6}^{3-}$ and $\mathrm{NiCl}_{4}^{2-}$
2 $\mathrm{TiF}_{6}^{2-}$ and $\mathrm{CoF}_{6}^{3-}$
3 $\mathrm{Cu}_{2} \mathrm{Cl}_{2}$ and $\mathrm{NiCl}_{4}^{2-}$
4 $\mathrm{TiF}_{6}^{2-}$ and $\mathrm{Cu}_{2} \mathrm{Cl}_{2}$
J and K CET-(2003)
COORDINATION COMPOUNDS

274374 Which give colored carbonate precipitate?

1 $\mathrm{Hg}_{2}^{2+}$
2 $\mathrm{Sr}^{+2}$
3 $\mathrm{Bi}^{+3}$
4 $\mathrm{Li}^{+}$
AIIMS 26 May 2019 (Morning)
COORDINATION COMPOUNDS

274376 Two complexes $\left[\mathrm{Cr}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right] \mathrm{Cl}_{3}(\mathrm{~A})$ and
$\left[\mathrm{Cr}\left(\mathrm{NH}_{3}\right)_{6}\right] \mathrm{Cl}_{3}$ (B) are violet and yellow coloured, respectively. The incorrect statement regarding them is

1 $\Delta_{0}$ value for (A) is less than that of (B)
2 both absorb energies corresponding to their complementary colours
3 $\Delta_{0}$ values of (A) and (B) are calculated from the energies of violet and yellow light, respectively
4 both are paramagnetic with three unpaired electrons
JEE Main 2019
COORDINATION COMPOUNDS

274379 In acidic medium which of the following does not change its colour?

1 $\mathrm{MnO}_{4}^{-}$
2 $\mathrm{MnO}_{4}^{2-}$
3 $\mathrm{CrO}_{4}^{2-}$
4 $\mathrm{FeO}_{4}^{2-}$
2018 (E)]**
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COORDINATION COMPOUNDS

274368 Amongst $\mathrm{TiF}_{6}^{2-}, \mathrm{CoF}_{6}^{3-}, \mathrm{Cu}_{2} \mathrm{Cl}_{2}$ and $\mathrm{NiCl}_{4}^{2-}$ (at. no. $\mathrm{Ti}=22, \mathrm{Co}=27, \mathrm{Cu}=29, \mathrm{Ni}=28$ ). The colourless species are

1 $\mathrm{CoF}_{6}^{3-}$ and $\mathrm{NiCl}_{4}^{2-}$
2 $\mathrm{TiF}_{6}^{2-}$ and $\mathrm{CoF}_{6}^{3-}$
3 $\mathrm{Cu}_{2} \mathrm{Cl}_{2}$ and $\mathrm{NiCl}_{4}^{2-}$
4 $\mathrm{TiF}_{6}^{2-}$ and $\mathrm{Cu}_{2} \mathrm{Cl}_{2}$
J and K CET-(2003)
COORDINATION COMPOUNDS

274374 Which give colored carbonate precipitate?

1 $\mathrm{Hg}_{2}^{2+}$
2 $\mathrm{Sr}^{+2}$
3 $\mathrm{Bi}^{+3}$
4 $\mathrm{Li}^{+}$
AIIMS 26 May 2019 (Morning)
COORDINATION COMPOUNDS

274376 Two complexes $\left[\mathrm{Cr}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right] \mathrm{Cl}_{3}(\mathrm{~A})$ and
$\left[\mathrm{Cr}\left(\mathrm{NH}_{3}\right)_{6}\right] \mathrm{Cl}_{3}$ (B) are violet and yellow coloured, respectively. The incorrect statement regarding them is

1 $\Delta_{0}$ value for (A) is less than that of (B)
2 both absorb energies corresponding to their complementary colours
3 $\Delta_{0}$ values of (A) and (B) are calculated from the energies of violet and yellow light, respectively
4 both are paramagnetic with three unpaired electrons
JEE Main 2019
COORDINATION COMPOUNDS

274379 In acidic medium which of the following does not change its colour?

1 $\mathrm{MnO}_{4}^{-}$
2 $\mathrm{MnO}_{4}^{2-}$
3 $\mathrm{CrO}_{4}^{2-}$
4 $\mathrm{FeO}_{4}^{2-}$
2018 (E)]**
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COORDINATION COMPOUNDS

274368 Amongst $\mathrm{TiF}_{6}^{2-}, \mathrm{CoF}_{6}^{3-}, \mathrm{Cu}_{2} \mathrm{Cl}_{2}$ and $\mathrm{NiCl}_{4}^{2-}$ (at. no. $\mathrm{Ti}=22, \mathrm{Co}=27, \mathrm{Cu}=29, \mathrm{Ni}=28$ ). The colourless species are

1 $\mathrm{CoF}_{6}^{3-}$ and $\mathrm{NiCl}_{4}^{2-}$
2 $\mathrm{TiF}_{6}^{2-}$ and $\mathrm{CoF}_{6}^{3-}$
3 $\mathrm{Cu}_{2} \mathrm{Cl}_{2}$ and $\mathrm{NiCl}_{4}^{2-}$
4 $\mathrm{TiF}_{6}^{2-}$ and $\mathrm{Cu}_{2} \mathrm{Cl}_{2}$
J and K CET-(2003)
COORDINATION COMPOUNDS

274374 Which give colored carbonate precipitate?

1 $\mathrm{Hg}_{2}^{2+}$
2 $\mathrm{Sr}^{+2}$
3 $\mathrm{Bi}^{+3}$
4 $\mathrm{Li}^{+}$
AIIMS 26 May 2019 (Morning)
COORDINATION COMPOUNDS

274376 Two complexes $\left[\mathrm{Cr}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right] \mathrm{Cl}_{3}(\mathrm{~A})$ and
$\left[\mathrm{Cr}\left(\mathrm{NH}_{3}\right)_{6}\right] \mathrm{Cl}_{3}$ (B) are violet and yellow coloured, respectively. The incorrect statement regarding them is

1 $\Delta_{0}$ value for (A) is less than that of (B)
2 both absorb energies corresponding to their complementary colours
3 $\Delta_{0}$ values of (A) and (B) are calculated from the energies of violet and yellow light, respectively
4 both are paramagnetic with three unpaired electrons
JEE Main 2019
COORDINATION COMPOUNDS

274379 In acidic medium which of the following does not change its colour?

1 $\mathrm{MnO}_{4}^{-}$
2 $\mathrm{MnO}_{4}^{2-}$
3 $\mathrm{CrO}_{4}^{2-}$
4 $\mathrm{FeO}_{4}^{2-}$
2018 (E)]**
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COORDINATION COMPOUNDS

274368 Amongst $\mathrm{TiF}_{6}^{2-}, \mathrm{CoF}_{6}^{3-}, \mathrm{Cu}_{2} \mathrm{Cl}_{2}$ and $\mathrm{NiCl}_{4}^{2-}$ (at. no. $\mathrm{Ti}=22, \mathrm{Co}=27, \mathrm{Cu}=29, \mathrm{Ni}=28$ ). The colourless species are

1 $\mathrm{CoF}_{6}^{3-}$ and $\mathrm{NiCl}_{4}^{2-}$
2 $\mathrm{TiF}_{6}^{2-}$ and $\mathrm{CoF}_{6}^{3-}$
3 $\mathrm{Cu}_{2} \mathrm{Cl}_{2}$ and $\mathrm{NiCl}_{4}^{2-}$
4 $\mathrm{TiF}_{6}^{2-}$ and $\mathrm{Cu}_{2} \mathrm{Cl}_{2}$
J and K CET-(2003)
COORDINATION COMPOUNDS

274374 Which give colored carbonate precipitate?

1 $\mathrm{Hg}_{2}^{2+}$
2 $\mathrm{Sr}^{+2}$
3 $\mathrm{Bi}^{+3}$
4 $\mathrm{Li}^{+}$
AIIMS 26 May 2019 (Morning)
COORDINATION COMPOUNDS

274376 Two complexes $\left[\mathrm{Cr}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right] \mathrm{Cl}_{3}(\mathrm{~A})$ and
$\left[\mathrm{Cr}\left(\mathrm{NH}_{3}\right)_{6}\right] \mathrm{Cl}_{3}$ (B) are violet and yellow coloured, respectively. The incorrect statement regarding them is

1 $\Delta_{0}$ value for (A) is less than that of (B)
2 both absorb energies corresponding to their complementary colours
3 $\Delta_{0}$ values of (A) and (B) are calculated from the energies of violet and yellow light, respectively
4 both are paramagnetic with three unpaired electrons
JEE Main 2019
COORDINATION COMPOUNDS

274379 In acidic medium which of the following does not change its colour?

1 $\mathrm{MnO}_{4}^{-}$
2 $\mathrm{MnO}_{4}^{2-}$
3 $\mathrm{CrO}_{4}^{2-}$
4 $\mathrm{FeO}_{4}^{2-}$
2018 (E)]**