1
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
2
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
3
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
$$[Ar]3d^44s^2$$
4
COMEDK 2020
MCQ (Single Correct Answer)
+1
-0

Formation of coloured solution is possible, when metal ion in the compound contains

A
paired electrons
B
unpaired electrons
C
lone pair of electrons
D
None of the above
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