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1
JEE Main 2025 (Online) 29th January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The correct option with order of melting points of the pairs (Mn, Fe), (Tc, Ru) and (Re, Os) is :

A

Fe < Mn, Ru < Tc and Re < Os

B

Fe < Mn, Ru < Tc and Os < Re

C

Mn < Fe, Tc < Ru and Re < Os

D

Mn < Fe, Tc < Ru and Os < Re

2
JEE Main 2025 (Online) 28th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
The amphoteric oxide among $\mathrm{V}_2 \mathrm{O}_3, \mathrm{~V}_2 \mathrm{O}_4$ and $\mathrm{V}_2 \mathrm{O}_5$, upon reaction with alkali leads to formation of an oxide anion. The oxidation state of V in the oxide anion is :
A

+ 4

B

+ 5

C

+ 3

D

+ 7

3
JEE Main 2025 (Online) 28th January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The metal ion whose electronic configuration is not affected by the nature of the ligand and which gives a violet colour in non-luminous flame under hot condition in borax bead test is

A
$\mathrm{Cr}^{3+}$
B
$\mathrm{Ti}^{3+}$
C
$\mathrm{Ni}^{2+}$
D
$\mathrm{Mn}^{2+}$
4
JEE Main 2025 (Online) 24th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Match List - I with List - II.

List - I
(Transition metal ion)		 List - II
(Spin only magnetic moment (B.M.))
(A) $\mathrm{Ti}^{3+}$ (I) 3.87
(B) $\mathrm{V}^{2+}$ (II) 0.00
(C) $\mathrm{Ni}^{2+}$ (III) 1.73
(D) $\mathrm{Sc}^{3+}$ (IV) 2.84

Choose the correct answer from the options given below :

A
$\mathrm{(A) -(III}),(\mathrm{B})-(\mathrm{I}),(\mathrm{C})-(\mathrm{IV}),(\mathrm{D})-(\mathrm{II})$
B
$(\mathrm{A})-(\mathrm{II}),(\mathrm{B})-(\mathrm{IV}),(\mathrm{C})-(\mathrm{I}),(\mathrm{D})-(\mathrm{III})$
C
$(\mathrm{A})-(\mathrm{III}),(\mathrm{B})-(\mathrm{I}),(\mathrm{C})-(\mathrm{II}),(\mathrm{D})-(\mathrm{IV})$
D
$(\mathrm{A})-(\mathrm{IV}),(\mathrm{B})-(\mathrm{II}),(\mathrm{C})-(\mathrm{III}),(\mathrm{D})-(\mathrm{I})$
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