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20
MCQ (Multiple Correct Answer)

Which of the following complexes are heteroleptic?

A
$\left[\mathrm{Cr}\left(\mathrm{NH}_3\right)_6\right]^{3+}$
B
$\left[\mathrm{Fe}\left(\mathrm{NH}_3\right)_4 \mathrm{Cl}_2\right]^{+}$
C
$\left.\left[\mathrm{Mn}(\mathrm{CN})_6\right)\right]^{4-}$
D
$\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_4 \mathrm{Cl}_2\right]$
21
MCQ (Multiple Correct Answer)

Identify the optically active compounds from the following

A
$\left[\mathrm{Co}(\mathrm{en})_3\right]^{3+}$
B
trans $-\left[\mathrm{Co}(\mathrm{en})_2 \mathrm{Cl}_2\right]^{+}$
C
cis $-\left[\mathrm{Co}(\mathrm{en}){ }_2 \mathrm{Cl}_2\right]^{+}$
D
$\left[\mathrm{Cr}\left(\mathrm{NH}_3\right)_5 \mathrm{Cl}\right]$
22
MCQ (Multiple Correct Answer)

Identify the correct statements for the behaviour of ethane-1, 2diamine as a ligand.

A
It is a neutral ligand
B
It is a didentate ligand
C
It is a chelating ligand
D
It is a unidentate ligand
23
MCQ (Multiple Correct Answer)

Which of the following complexes show linkage isomerism?

A
$\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5\left(\mathrm{NO}_2\right)\right]^{2+}$
B
$\left[\mathrm{Co}\left(\mathrm{H}_2 \mathrm{O}\right)_5 \mathrm{CO}^{3+}\right.$
C
$\left[\mathrm{Cr}\left(\mathrm{NH}_3\right)_5\right] \mathrm{SCN}^{2+}$
D
$\left[\mathrm{Fe}(\mathrm{en}){ }_2 \mathrm{Cl}_2\right]^{+}$
24
Subjective

Arrange the following complexes in the increasing order of conductivity of their solution

$$\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_3 \mathrm{Cl}_3\right],\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_4 \mathrm{Cl}_2\right] \mathrm{Cl},\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right] \mathrm{Cl}_3,\left[\mathrm{Cr}\left(\mathrm{NH}_3\right)_5 \mathrm{Cl}\right] \mathrm{Cl}_2$$

Explanation

Ions or molecules present outside the coordination sphere are ionisable. A complex which gives more ions on dissolution, is more conducting.

$$\underset{(1 \text { ion) }}{\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_3 \mathrm{Cl}_3\right]}<\underset{\text { (2 ions) }}{\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_4 \mathrm{Cl}_2\right] \mathrm{Cl}}<\underset{\text { (3 ions) }}{\left[\mathrm{Cr}\left(\mathrm{NH}_3\right)_5 \mathrm{Cl}\right] \mathrm{Cl}_2}<\underset{\text { (4 ions) }}{\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right] \mathrm{Cl}_3}$$

Here, number of ions increases and conductivity increases.