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1
VITEEE 2025
MCQ (Single Correct Answer)
+4
-1

Which of the following complex ions is expected to appear colourless in aqueous solution?

A

$\left[\mathrm{Zn}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+}$

B

$\left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+}$

C

$\left[\mathrm{Cu}\left(\mathrm{NH}_3\right)_4\right]^{2+}$

D

$\left[\mathrm{CoCl}_4\right]^{2-}$

2
VITEEE 2024
MCQ (Single Correct Answer)
+4
-1

Among the following complexes, the one that can exist as facial ( fac ) and meridional (mer) isomers is

A
$\left[\mathrm{Co}\left(\mathrm{NO}_2\right)_3\left(\mathrm{NH}_3\right)_3\right]$
B
$\mathrm{K}_3\left[\mathrm{Fe}(\mathrm{CN})_6\right]$
C
$\left[\mathrm{Co}\left(\mathrm{H}_2 \mathrm{O}\right)_2\left(\mathrm{NH}_3\right)_4\right] \mathrm{Cl}_3$
D
$\left[\mathrm{CoCl}\left(\mathrm{NH}_3\right)_5\right] \mathrm{Cl}_2$
3
VITEEE 2024
MCQ (Single Correct Answer)
+4
-1

Which of the following complex ions is expected to absorb visible light?

A
$\left[\mathrm{Ti}(e n)_2\left(\mathrm{NH}_3\right)_2{ }^{4+}\right.$
B
$\left[\mathrm{Cr}\left(\mathrm{NH}_3\right)_6\right]^{3+}$
C
$\left[\mathrm{Zn}\left(\mathrm{NH}_3\right)_6\right]^{2+}$
D
$\mathrm{Sc}\left[\left(\mathrm{H}_2 \mathrm{O}\right)_3\left(\mathrm{NH}_3\right)_3\right]^{3+}$
4
VITEEE 2023
MCQ (Single Correct Answer)
+4
-1

The total number of metal-metal bond present in $$\left[\mathrm{Co}_2(\mathrm{CO})_8\right]$$ is

A
0
B
3
C
2
D
1
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