1
COMEDK 2025 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0

Which one of the following structures in Column I does not have the correct IUPAC name as given in Column II.

S.No. Structure IUPAC name
A. $\left[\mathrm{CoBr}_2(\mathrm{en})_2\right] \mathrm{Cl}$ P. Dibromidodi-( ethan-1, 2 - diamine)cobalt (III) chloride
B. $\mathrm{Na}\left[\mathrm{PtBrCl}\left(\mathrm{NO}_2\right)\left(\mathrm{NH}_3\right)\right]$ Q. Sodium amminebromidochloridonitrito- N - palatinate(II)
C. $\left[\mathrm{Cr}\left(\mathrm{H}_2 \mathrm{O}\right)_2\left(\mathrm{NH}_3\right)_4 \mathrm{Cl}\right] \mathrm{SO}_4$ R. Tetraamminediaquachloridochromium (III) sulphate.
D. $\left[\mathrm{Pt}\left(\mathrm{NH}_3\right)_4\right]\left[\mathrm{PtCl}_4\right]$ S. Tetraammineplatinum (II) tetrachloridoplatinate (II)

A
B
B
A
C
D
D
C
2
COMEDK 2025 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0
A transition metal M forms 4 homoleptic octahedral coordination compounds, $\mathrm{A}, \mathrm{B}, \mathrm{C}$ and D of the type $\left[\mathrm{MX}_6\right]^{z-}$ with monodentate ligands a, b, c and d respectively. These compounds absorb red. blue. yellow and blue-green light respectively. Which one of the options shows the correct order of decreasing ligand strength?
A
$\mathrm{B}>\mathrm{D}>\mathrm{C}>\mathrm{A}$
B
$\mathrm{D}>\mathrm{C}>\mathrm{B}>\mathrm{A}$
C
$\mathrm{A}>\mathrm{C}>\mathrm{D}>\mathrm{B}$
D
$\mathrm{A}>\mathrm{B}>\mathrm{C}>\mathrm{D}$
3
COMEDK 2025 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0
Choose the coordination compound which does not exhibit Optical activity.
A
cis $-\left[\mathrm{PtCl}_2(\mathrm{en}) 2\right]^{2+}$
B
$\left[\mathrm{Co}(\mathrm{en})_3\right]^{3+}$
C
trans $-\left[\mathrm{CoCl}_2(\mathrm{en})_2\right]^{+}$
D
cis $-\left[\mathrm{CoCl}_2(\mathrm{en})_2\right]^{+}$
4
COMEDK 2025 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0
The correct order of spin only magnetic moments among the following is: [Given: Atomic numbers: $\mathrm{Mn}=25, \mathrm{Fe}=26, \mathrm{Co}=27$ ]
A
$\left[\mathrm{Fe}(\mathrm{CN})_6\right]^{4-}>\left[\mathrm{MnCl}_4\right]^{2-}>\left[\mathrm{CoCl}_4\right]^{2-}$
B
$\left[\mathrm{MnCl}_4\right]^{2-}>\left[\mathrm{CoCl}_4\right]^{2-}>\left[\mathrm{Fe}(\mathrm{CN})_6\right]^{4-}$
C
$\left[\mathrm{Fe}(\mathrm{CN})_6\right]^{4-}>\left[\mathrm{CoCl}_4\right]^{2-}>\left[\mathrm{MnCl}_4\right]^{2-}$
D
$\left[\mathrm{MnCl}_4\right]^{2-}>\left[\mathrm{Fe}(\mathrm{CN})_6\right]^{4-}>\left[\mathrm{CoCl}_4\right]^{2-}$
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