COMEDK 2025 Morning Shift | Coordination Compounds Question 1 | Chemistry

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.

$\left[\mathrm{Cr}\left(\mathrm{H}_2 \mathrm{O}\right)_4 \mathrm{Cl}_2\right] \mathrm{Cl} \cdot 2 \mathrm{H}_2 \mathrm{O}$

$\left[\mathrm{Cr}\left(\mathrm{H}_2 \mathrm{O}\right)_3 \mathrm{Cl}_3\right] \cdot 3 \mathrm{H}_2 \mathrm{O}$

$\left[\mathrm{Cr}\left(\mathrm{H}_2 \mathrm{O}\right)_5 \mathrm{Cl}\right] \mathrm{Cl}_2 \cdot \mathrm{H}_2 \mathrm{O}$

$\left[\mathrm{Cr}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right] \mathrm{Cl}_3$

COMEDK 2025 Morning Shift

MCQ (Single Correct Answer)

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Which one of the following coordination compounds will exhibit both geometrical and optical isomerism?

$\left[\operatorname{Cr}(\mathrm{ox})_3\right]^{3-}$

$\left[\mathrm{Co}(\mathrm{en})_2 \mathrm{Cl}_2\right]^{+}$

$[\mathrm{Co}(\mathrm{CN}) 6]^{3-}$

$\left[\mathrm{Co}\left(\mathrm{NO}_3\right)_3\left(\mathrm{NH}_3\right)_3\right]$

COMEDK 2025 Morning Shift

MCQ (Single Correct Answer)

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Arrange the following compounds in the decreasing order of the molar conductivities of their aqueous solutions.

A	B	C	D
$\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5 \mathrm{Cl}\right] \mathrm{Cl}_2$	$\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_3 \mathrm{Cl}_3\right]$	$\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_4 \mathrm{Cl}_2\right] \mathrm{Cl}$	$\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right] \mathrm{Cl}_3$

$\mathrm{B}>\mathrm{C}>\mathrm{A}>\mathrm{D}$

$\mathrm{D}>\mathrm{A}>\mathrm{C}>\mathrm{B}$

$\mathrm{B}>\mathrm{A}>\mathrm{C}>\mathrm{D}$

$\mathrm{A}>\mathrm{B}>\mathrm{D}>\mathrm{C}$

COMEDK 2025 Morning Shift

MCQ (Single Correct Answer)

-0

Match the coordination compounds in Column I having the given type of hybridisation of $\mathrm{M}^{\mathrm{n}+}$ ion and magnetic moment as given in Column II.

	Coordination compounds		Hybridisation & Magnetic nature
A.	$\mathrm{Ni}(\mathrm{CO})_4$	P.	$\mathrm{sp}^3, \quad \mu=5.92 \mathrm{BM}$
B.	$\left[\mathrm{Ni}(\mathrm{CN})_4\right]^{2-}$	Q.	$\mathrm{sp}^3, \quad \mu=2.84 \mathrm{BM}$
C.	$\left[\mathrm{Ni}(\mathrm{Cl})_4\right]^{2-}$	R.	$\mathrm{sp}^3, \quad \mu=0$
D.	$\left[\mathrm{MnBr}_4\right]^{2-}$	S.	$\mathrm{dsp}^2, \quad \mu=0$

$\mathrm{A}=\mathrm{R} \quad \mathrm{B}=\mathrm{S} \quad \mathrm{C}=\mathrm{Q} \quad \mathrm{D}=\mathrm{P}$

$A=S \quad B=R \quad C=P \quad D=Q$

$\mathrm{A}=\mathrm{S} \quad \mathrm{B}=\mathrm{P} \quad \mathrm{C}=\mathrm{R} \quad \mathrm{D}=\mathrm{Q}$

$\mathrm{A}=\mathrm{Q} \quad \mathrm{B}=\mathrm{P} \quad \mathrm{C}=\mathrm{S} \quad \mathrm{D}=\mathrm{R}$

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