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

Match the metals in Column II with their characteristic properties given in Column I.

Properties Metals
A. Lanthanoid with low value of $3^{\text {rd }}$ ionisation enthalpy. P V
B. f-Block element with electronic configuration $[R n] 6 d^2 7 s^2$ Q Gd
C. 3 d -series metal whose $\mathrm{M}^{3+}{ }_{(\mathrm{aq})}$ is colourless. R Th
D. 3d-series metal with highest $\Delta \mathrm{H}_{\text {(atomisation) }}$ S Sc

A
$\mathrm{A}=\mathrm{Q} \quad \mathrm{B}=\mathrm{R} \quad \mathrm{C}=\mathrm{S} \quad \mathrm{D}=\mathrm{P}$
B
$\mathrm{A}=\mathrm{R} \quad \mathrm{B}=\mathrm{Q} \quad \mathrm{C}=\mathrm{S} \quad \mathrm{D}=\mathrm{P}$
C
$\mathrm{A}=\mathrm{R} \quad \mathrm{B}=\mathrm{Q} \quad \mathrm{C}=\mathrm{P} \quad \mathrm{D}=\mathrm{S}$
D
$\mathrm{A}=\mathrm{S} \quad \mathrm{B}=\mathrm{R} \quad \mathrm{C}=\mathrm{Q} \quad \mathrm{D}=\mathrm{P}$
2
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
Choose the correct statement.
A
Ionic compounds of $\mathrm{Sc}^{3+}$ and $\mathrm{Cu}^{+}$are coloured because of $\mathrm{d}-\mathrm{d}$ electronic transitions
B
The order in which the paramagnetic nature of the 4 cations $\mathrm{Cr}^{2+}, \mathrm{Mn}^{2+}, \mathrm{V}^{2+}$ and $\mathrm{Fe}^{2+}$ vary is $\mathrm{V}^{2+}<\mathrm{Cr}^{2+}=\mathrm{Mn}^{2+}<\mathrm{Fe}^{2+}$
C
As the oxidation number of the transition element increases, the ionic nature decreases and the oxides show acidic nature predominantly
D
The metal Cobalt has the electronic configuration $[\mathrm{Ar}] 3 \mathrm{~d}^5$ in the +3 oxidation state
3
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0

COMEDK 2025 Morning Shift Chemistry - d and f Block Elements Question 1 English

What is the spin only magnetic moment of the metal ion in $\mathbf{P}$ and the oxidation number of Sulphur in the oxidised product Z ?

A
$\mu=0 \quad$ Oxidation number $=+4$
B
$\mu=5.00 \mathrm{BM} \quad$ Oxidation number $=0$
C
$\mu=5.92 \mathrm{BM} \quad$ Oxidation number $=+2$
D
$\mu=1.732 \mathrm{BM} \quad$ Oxidation number $=+6$
4
COMEDK 2024 Evening Shift
MCQ (Single Correct Answer)
+1
-0

Identify the correct statement from the following.

A
The green manganate ion shows diamagnetic nature but the permanganate ion exhibits paramagnetic nature
B
Interstitial compounds of transition metals have lower melting points than that of pure transition metals and their compounds are chemically reactive
C
Cerium is a lanthanoid metal which exists in a stable oxidation state of +4 , besides exhibiting an oxidation state of +3
D
$$\mathrm{Cr}(\mathrm{VI})$$ is more stable than $$\mathrm{W}(\mathrm{VI})$$ and hence acts as a good oxidising agent
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