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1
COMEDK 2024 Evening Shift
MCQ (Single Correct Answer)
+1
-0

The Lanthanoid ion which would form coloured compounds is -------------.

Atomic numbers: $$\mathrm{Yb}=70, \quad \mathrm{Lu}=71, \mathrm{Pr}=59, \quad \mathrm{La}=57$$

A
$$Y b^{2+}$$
B
$$L a^{3+}$$
C
$$L u^{3+}$$
D
$$\operatorname{Pr}^{3+}$$
2
COMEDK 2024 Morning Shift
MCQ (Single Correct Answer)
+1
-0

Arrange the following ions in the increasing order of their $$\Delta H_{(\text {hydration})}$$ values.

$$\mathrm{Cr}^{2+}, \mathrm{Co}^{2+}, \mathrm{Mn}^{2+}, \mathrm{Ni}^{2+}$$

A
$$ \mathrm{Co}^{2+}<\mathrm{Ni}^{2+}<\mathrm{Cr}^{2+}<\mathrm{Mn}^{2+} $$
B
$$ \mathrm{Cr}^{2+}<\mathrm{Mn}^{2+}<\mathrm{Co}^{2+}<\mathrm{Ni}^{2+} $$
C
$$ \mathrm{Ni}^{2+}<\mathrm{Co}^{2+}<\mathrm{Mn}^{2+}<\mathrm{Cr}^{2+} $$
D
$$ \mathrm{Mn}^{2+}<\mathrm{Cr}^{2+}<\mathrm{Co}^{2+}<\mathrm{Ni}^{2+} $$
3
COMEDK 2024 Morning Shift
MCQ (Single Correct Answer)
+1
-0

The permanganate ion in acid medium acts as an oxidant and gets converted to its lower oxidation state. What would be the spin only magnetic moment of such reduced manganese ion?

A
2.84 BM
B
4.90 BM
C
3.87 BM
D
5.92 BM
4
COMEDK 2024 Morning Shift
MCQ (Single Correct Answer)
+1
-0

Match the compounds given in Column I with their characteristic features listed in Column II

No. Column I No. Column II
A $$
\mathrm{La}(\mathrm{OH})_3
$$		 P Acidic in nature
B $$
\mathrm{Mn}_2 \mathrm{O}_7
$$		 Q Least basic
C $$
\mathrm{Lu}(\mathrm{OH}) 3
$$		 R Interstitial compound
D $$
\mathrm{Fe}_3 \mathrm{H}
$$		 S Most basic

A
$$ \mathrm{A}=\mathrm{S} \quad \mathrm{B}=\mathrm{P} \quad \mathrm{C}=\mathrm{Q} \quad \mathrm{D}=\mathrm{R} $$
B
$$ \mathrm{A}=\mathrm{S} \quad \mathrm{B}=\mathrm{R} \quad \mathrm{C}=\mathrm{Q} \quad \mathrm{D}=\mathrm{P} $$
C
$$ \begin{array}{llll} \mathrm{A}=\mathrm{Q} & \mathrm{B}=\mathrm{P} & \mathrm{C}=\mathrm{S} & \mathrm{D}=\mathrm{R} \end{array} $$
D
$$ \begin{array}{llll} \mathrm{A}=\mathrm{R} & \mathrm{B}=\mathrm{P} & \mathrm{C}=\mathrm{S} & \mathrm{D}=\mathrm{Q} \end{array} $$
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