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1
COMEDK 2023 Evening Shift
MCQ (Single Correct Answer)
+1
-0

Identify the incorrect statement.

A
Ability of Fluorine to stabilise higher oxidation states in transition metals is due to the low lattice enthalpy of the fluorides.
B
The second and third Ionisation enthalpies of $$\mathrm{Mn}^{2+}$$ and $$\mathrm{Fe}^{3+}$$ respectively have lower values than expected.
C
Transition metals readily form alloys because their metallic radii are within about $$15 \%$$ of each other.
D
$$\mathrm{Cr}^{2+}$$ acts as reducing agent while $$\mathrm{Mn}^{3+}$$ acts as an oxidising agent though both the ions have $$\mathrm{d}^4$$ configuration.
2
COMEDK 2021
MCQ (Single Correct Answer)
+1
-0

An aqueous solution of X on addition of hydrogen peroxide in ice cold conditions gives blue colour to the ethereal layer. Then, X can be

A
acidified potassium chromate
B
alkaline potassium dichromate
C
acidified potassium manganate
D
acidified potassium permanganate
3
COMEDK 2021
MCQ (Single Correct Answer)
+1
-0

In 3d-transmission series, which one has the least melting point?

A
V
B
Zn
C
Mn
D
Cu
4
COMEDK 2020
MCQ (Single Correct Answer)
+1
-0

The electronic configuration of Cr$$^{3+}$$ is

A
$$[Ar]3d^54s^1$$
B
$$[Ar]3d^24s^1$$
C
$$[Ar]3d^34s^0$$
D
$$[Ar]3d^44s^2$$
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