Question 1: Palette 1/9

AIIMS 2019 MCQ

$\left[\mathrm{Co}\left(\mathrm{C}_2 \mathrm{O}_4\right)_3\right]^{3-}$ is a

A

low spin complex

B

paramagnetic

C

high spin

D

$s p^3 d^2$-hybridised

Question 2: Palette 2/9

AIIMS 2019 MCQ

Correct increasing order for the wavelength of absorption in the visible region for the complexes of $\mathrm{Co}^{3+}$ is

A

$\left[\mathrm{Co}(\mathrm{CN})_6\right]^{3-},\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right]^{3+} \text {, } \left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5\left(\mathrm{H}_2 \mathrm{O}\right)\right]^{3+},\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5 \mathrm{Cl}\right]^{+2}$

B

$\begin{aligned} & {\left[\mathrm{Co}(\mathrm{CN})_6\right]^{3-},\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5\left(\mathrm{H}_2 \mathrm{O}\right)\right]^{3+}} \\ & {\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5 \mathrm{Cl}\right]^{2+},\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right]^{3+}} \end{aligned}$

C

$\begin{aligned} & {\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right]^{3+},\left[\mathrm{Co}(\mathrm{CN})_6\right]^{3-},\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5\left(\mathrm{H}_2 \mathrm{O}\right)\right]^{3+},} \\ & {\left[\mathrm{Co}\left(\mathrm{NH}_3\right) \mathrm{Cl}\right]^{+2}} \end{aligned}$

D

$\begin{aligned} & {\left[\mathrm{Co}(\mathrm{NH})_5 \mathrm{Cl}\right]^{+2},\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5\left(\mathrm{H}_2 \mathrm{O}\right)\right]^{3+},} \\ & {\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right]^{3+},\left[\mathrm{Co}(\mathrm{CN})_6\right]^{3-}} \end{aligned}$

Question 3: Palette 3/9

AIIMS 2019 MCQ

Which of the following complex is optically inactive?

A

$\left[\mathrm{RhCl}(\mathrm{CO})\left(\mathrm{PPh}_3\right)\left(\mathrm{NH}_3\right)\right]$

B

$\left[\mathrm{Fe}\left(\mathrm{C}_2 \mathrm{O}_4\right)_3\right]^{3-}$

C

$\left[\mathrm{Fe}(\mathrm{en})_2 \mathrm{Cl}_2\right]$

D

$\left[\mathrm{Pd}(\mathrm{en})_2 \mathrm{Cl}_2\right]$

Question 4: Palette 4/9

AIIMS 2018 MCQ

The electronic configuration of central metal atom/ion in $\left[\mathrm{Co}(\mathrm{CN})_6\right]^{3-}$ is

A

$t_{2 g}^5 e_g^0$

B

$t_{2 g}^4 e_g^2$

C

$t_{2 g}^4 e_g^3$

D

$t_{2 g}^6 e_g^0$

Question 5: Palette 5/9

AIIMS 2018 MCQ

The spin only magnetic moment of $[\mathrm{MnBr}_4]^{2-}$ is $5.9 \mathrm{~BM}$. The geometry of this complex ion is

A

tetrahedral

B

octahedral

C

trigonal pyramidal

D

square planar

Question 6: Palette 6/9

AIIMS 2018 MCQ

Which of the following compound has same oxidation state of the central metal atom in the cationic and anionic part?

A

$\left[\mathrm{Pt}\left(\mathrm{NH}_3\right)_4\right]\left[\mathrm{PtCl}_6\right]$

B

$\left[\mathrm{Pt}\left(\mathrm{NH}_3\right)_4 \mathrm{Cl}_2\right]\left[\mathrm{PtCl}_4\right]$

C

$\left[\mathrm{Pt}(\mathrm{Py})_4\right]\left[\mathrm{PtCl}_4\right]$

D

$\mathrm{K}_4\left[\mathrm{Ni}(\mathrm{CN})_6\right]$

Question 7: Palette 7/9

AIIMS 2018 MCQ

The IUPAC name of the complex $[\mathrm{Pt}\left(\mathrm{NH}_3\right)_3 \mathrm{Br}\left(\mathrm{NO}_2\right) \mathrm{Cl}] \mathrm{Cl}$ is

A

triamine chloridobromidonitro platinum (IV) chloride

B

triamine bromidochloridonitro platinum (IV) chloride

C

triamine bromidochloridonitro platinum (II) chloride

D

triamine chloridobromidonitro platinum (II) chloride

Question 8: Palette 8/9

AIIMS 2018 MCQ

Among the following complex ions, the one which shows geometrical isomerism will be

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

$\left[\mathrm{CO}(\mathrm{CN})_5(\mathrm{NC})\right]^{3-}$

Question 9: Palette 9/9

AIIMS 2018 MCQ

Assertion (A) Toxic metal ions are removed by the chelating ligands.

Reason (R) Chelate complexes tend to be more stable.

A

Both (A) and (R) are true and (R) is the correct explanation of (A).

B

Both (A) and (R) are true, but (R) is not the correct explanation of (A).

C

(A) is true and (R) is false.

D

Both (A) and (R) are false.