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1
MCQ (Single Correct Answer)

Which of the following complexes formed by $\mathrm{Cu}^{2+}$ ions is most stable?

A
$\mathrm{Cu}^{2+}+4 \mathrm{NH}_3 \longrightarrow\left[\mathrm{Cu}\left(\mathrm{NH}_3\right)_4\right]^{2+}, \quad \log \mathrm{K}=11.6$
B
$\mathrm{Cu}^{2+}+4 \mathrm{CN}^{-} \longrightarrow\left[\mathrm{Cu}(\mathrm{CN})_4\right]^{2-}, \quad \log K=27.3$
C
$\mathrm{Cu}^{2+}+2 \mathrm{en}^{-} \longrightarrow\left[\mathrm{Cu}(\mathrm{en})_2\right]^{2+}, \quad \log K=15.4$
D
$\mathrm{Cu}^{2+}+4 \mathrm{H}_2 \mathrm{O} \longrightarrow\left[\mathrm{Cu}\left(\mathrm{H}_2 \mathrm{O}\right)_4\right]^{2+}, \quad \log K=8.9$
2
MCQ (Single Correct Answer)

The colour of the coordination compounds depends on the crystal field splitting. What will be the correct order of absorption of wavelength of light in the visible region, for the complexes, $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right]^{3+},\left[\mathrm{Co}(\mathrm{CN})_6\right]^{3-}$, $\left[\mathrm{Co}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+}$

A
$\left[\mathrm{Co}(\mathrm{CN})_6\right]^{3-}>\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right]^{3+}>\left[\mathrm{Co}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+}$
B
$\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right]^{3+}>\left[\mathrm{Co}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+}>\left[\mathrm{Co}(\mathrm{CN})_6\right]^{3-}$
C
$\left[\mathrm{Co}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+}>\left[\mathrm{Co}\left(\mathrm{NH}_{3)_6}\right]^{3+}>\left[\mathrm{Co}(\mathrm{CN})_6\right]^{3-}\right.$
D
$\left[\mathrm{Co}(\mathrm{CN})_6\right]^{3-}>\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right]^{3+}>\left[\mathrm{Co}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+}$
3
MCQ (Single Correct Answer)

When $0.1 \mathrm{~mol} \mathrm{CoCl}{ }_3\left(\mathrm{NH}_3\right)_5$ is treated with excess of $\mathrm{AgNO}_3, 0.2 \mathrm{~mol}$ of AgCl are obtained. The conductivity of solution will correspond to

A
$1:3$ electrolyte
B
$1:2$ electrolyte
C
$1:1$ electrolyte
D
$3: 1$ electrolyte
4
MCQ (Single Correct Answer)

When 1 mole of $\mathrm{CrCl}_3 \cdot 6 \mathrm{H}_2 \mathrm{O}$ is treated with excess of $\mathrm{AgNO}_3, 3$ moles of AgCl are obtained. The formula of the complex is

A
$\left[\mathrm{CrCl}_3\left(\mathrm{H}_2 \mathrm{O}\right)_3\right] \cdot 3 \mathrm{H}_2 \mathrm{O}$
B
$\left[\mathrm{CrCl}_2\left(\mathrm{H}_2 \mathrm{O}\right)_4\right] \mathrm{Cl} \cdot 2 \mathrm{H}_2 \mathrm{O}$
C
$\left[\mathrm{CrCl}\left(\mathrm{H}_2 \mathrm{O}\right)_5\right] \mathrm{Cl}_2 \cdot \mathrm{H}_2 \mathrm{O}$
D
$\left[\mathrm{Cr}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right] \mathrm{Cl}_3$
5
MCQ (Single Correct Answer)

The correct IUPAC name of $\left[\mathrm{Pt}\left(\mathrm{NH}_3\right)_2 \mathrm{Cl}_2\right]$ is

A
Diamminedichloridoplatinum (II)
B
Diamminedichloridoplatinum (IV)
C
Diamminedichloridoplatinum (0)
D
Dichloridodiammineplatinum (IV)
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