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

Based on Valence Bond Theory, match the complexes listed in Column I with the number of unpaired electrons on the central metal ion, given in Column II

No. Complex ions No. Number of unpaired electrons
(A) $$
\left[\mathrm{Fe} \mathrm{F}_6\right]^{3-}
$$
(P) 0
(B) $$
\left[\mathrm{Fe}(\mathrm{CN})_6\right]^{4-}
$$
(P) 1
(C) $$
\left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+}
$$
(R) 5
(D) $$
\left[\mathrm{Fe}(\mathrm{CN})_6\right]^{3-}
$$
(S) 4

A
$$ \mathrm{A}=\mathrm{S} \quad \mathrm{B}=\mathrm{Q} \quad \mathrm{C}=\mathrm{R} \quad \mathrm{D}=\mathrm{P} $$
B
$$ \mathrm{A}=\mathrm{S} \quad \mathrm{B}=\mathrm{Q} \quad \mathrm{C}=\mathrm{P} \quad \mathrm{D}=\mathrm{R} $$
C
$$ \mathrm{A}=\mathrm{R} \quad \mathrm{B}=\mathrm{P} \quad \mathrm{C}=\mathrm{S} \quad \mathrm{D}=\mathrm{Q} $$
D
$$ \mathrm{A}=\mathrm{R} \quad \mathrm{B}=\mathrm{S} \quad \mathrm{C}=\mathrm{Q} \quad \mathrm{D}=\mathrm{P} $$
2
COMEDK 2024 Evening Shift
MCQ (Single Correct Answer)
+1
-0
What are the Principal & Azimuthal quantum number values of the valence electrons in tripositive Lutetium?

A
$$ \mathrm{n}=4 \quad \& \quad 1=2 $$
B
$$ \mathrm{n}=5 \quad \& \quad 1=2 $$
C
$$ \mathrm{n}=5 \quad \& \quad 1=3 $$
D
$$ n=4 \quad \& \quad 1=3 $$
3
COMEDK 2024 Evening Shift
MCQ (Single Correct Answer)
+1
-0

What is the quantity of charge, in Faraday units, required for the reduction of 3.5 moles of $$\mathrm{Cr}_2 \mathrm{O} 7^{2-}$$ in acid medium?

A
6.0
B
10.5
C
21.0
D
3.0
4
COMEDK 2024 Evening Shift
MCQ (Single Correct Answer)
+1
-0

A dry cell consists of a moist paste of $$\mathrm{NH}_4 \mathrm{Cl}$$ and $$\mathrm{ZnCl}_2$$ contained in a $$\mathrm{Zn}$$ casing which encloses a Carbon rod surrounded by black $$\mathrm{MnO}_2$$ paste. What is the role of $$\mathrm{ZnCl}_2$$ in it?

A
It prevents pressure being developed in the cell due to $$\mathrm{NH}_3$$ gas formation.
B
It serves as cathode thus permitting Carbon rod to act as anode.
C
It acts as the anode while Carbon rod acts as the cathode.
D
It keeps the contents dry and prevents leakage of electrolyte.
EXAM MAP