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6
MCQ (Single Correct Answer)

The stabilisation of coordination compounds due to chelation is called the chelate effect. Which of the following is the most stable complex species?

A
$\left[\mathrm{Fe}(\mathrm{CO})_5\right]$
B
$\left[\mathrm{Fe}(\mathrm{CN})_6\right]^{3-}$
C
$\left[\mathrm{Fe}\left(\mathrm{C}_2 \mathrm{O}_4\right)_3\right]^{3-}$
D
$\left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+}$
7
MCQ (Single Correct Answer)

Indicate the complex ion which shows geometrical isomerism.

A
$\left[\mathrm{Cr}\left(\mathrm{H}_2 \mathrm{O}\right)_4 \mathrm{Cl}_2\right]^{+}$
B
$\left[\mathrm{Pt}\left(\mathrm{NH}_3\right)_3 \mathrm{Cl}\right]$
C
$\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right]^{3+}$
D
$\left[\mathrm{Co}(\mathrm{CN})_5(\mathrm{NC})\right]^{3-}$
8
MCQ (Single Correct Answer)

The CFSE for octahedral $\left[\mathrm{CoCl}_6\right]^{4-}$ is $18,000 \mathrm{~cm}^{-1}$. The CFSE for tetrahedral $\left[\mathrm{CoCl}_4\right]^{2-}$ will be

A
$18,000 \mathrm{~cm}^{-1}$
B
$16,000 \mathrm{~cm}^{-1}$
C
$8,000 \mathrm{~cm}^{-1}$
D
$20,000 \mathrm{~cm}^{-1}$
9
MCQ (Single Correct Answer)

Due to the presence of ambidentate ligands coordination compounds show isomerism. Palladium complexes of the type $\left[\mathrm{Pd}\left(\mathrm{C}_6 \mathrm{H}_5\right)_2(\mathrm{SCN})_2\right]$ and $\left[\mathrm{Pd}\left(\mathrm{C}_6 \mathrm{H}_5\right)_2(\mathrm{NCS})_2\right]$ are

A
linkage isomers
B
coordination isomers
C
ionisation isomers
D
geometrical isomers
10
MCQ (Single Correct Answer)

The compounds $\left[\mathrm{Co}\left(\mathrm{SO}_4\right)\left(\mathrm{NH}_3\right)_5\right] \mathrm{Br}$ and $\left[\mathrm{Co}\left(\mathrm{SO}_4\right)\left(\mathrm{NH}_3\right)_5\right] \mathrm{Cl}$ represent

A
linkage isomerism
B
ionisation isomerism
C
coordination isomerism
D
no isomerism
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