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1
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 $-\left[\mathrm{CoCl}_2(\mathrm{en})_2\right]^{+}$
2
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
$\left[\mathrm{MnCl}_4\right]^{2-}>\left[\mathrm{Fe}(\mathrm{CN})_6\right]^{4-}>\left[\mathrm{CoCl}_4\right]^{2-}$
3
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
An aqueous solution of $\mathrm{CrCl}_3 .6 \mathrm{H}_2 \mathrm{O}$ (Molar mass $=266.5 \mathrm{~g} / \mathrm{mol}$ ) containing 2.665 g of the solute after processing, when treated with excess of $\mathrm{AgNO}_3$ gave 2.87 g of AgCl (Molar mass of $\mathrm{AgCl}=143.5 \mathrm{~g} / \mathrm{mol}$ ) Choose the correct formula of the compound which give these results.
A
$\left[\mathrm{Cr}\left(\mathrm{H}_2 \mathrm{O}\right)_4 \mathrm{Cl}_2\right] \mathrm{Cl} \cdot 2 \mathrm{H}_2 \mathrm{O}$
B
$\left[\mathrm{Cr}\left(\mathrm{H}_2 \mathrm{O}\right)_3 \mathrm{Cl}_3\right] \cdot 3 \mathrm{H}_2 \mathrm{O}$
C
$\left[\mathrm{Cr}\left(\mathrm{H}_2 \mathrm{O}\right)_5 \mathrm{Cl}\right] \mathrm{Cl}_2 \cdot \mathrm{H}_2 \mathrm{O}$
D
$\left[\mathrm{Cr}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right] \mathrm{Cl}_3$
4
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
Which one of the following coordination compounds will exhibit both geometrical and optical isomerism?
A
$\left[\operatorname{Cr}(\mathrm{ox})_3\right]^{3-}$
B
$\left[\mathrm{Co}(\mathrm{en})_2 \mathrm{Cl}_2\right]^{+}$
C
$[\mathrm{Co}(\mathrm{CN}) 6]^{3-}$
D
$\left[\mathrm{Co}\left(\mathrm{NO}_3\right)_3\left(\mathrm{NH}_3\right)_3\right]$
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