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1
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
$$ \mathrm{Mn}^{2+}<\mathrm{Cr}^{2+}<\mathrm{Co}^{2+}<\mathrm{Ni}^{2+} $$
2
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
3
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
$$ \begin{array}{llll} \mathrm{A}=\mathrm{R} & \mathrm{B}=\mathrm{P} & \mathrm{C}=\mathrm{S} & \mathrm{D}=\mathrm{Q} \end{array} $$
4
COMEDK 2024 Morning Shift
MCQ (Single Correct Answer)
+1
-0

Choose the incorrect statement from the following

A
The ability of Fluorine to stabilise the higher oxidation states of transition metals exceeds that of Oxygen
B
$$\mathrm{Cu}$$ (I) compounds in aqueous medium undergo disproportionation reaction
C
$$\mathrm{Cr}^{2+}$$ is a stronger reducing agent than $$\mathrm{Fe}^{2+}$$
D
$$\mathrm{MoO}_3$$ and $$\mathrm{WO}_3$$ are not as strong oxidants as $$\mathrm{CrO}_3$$
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