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

Pair of transition metal ions having the same number of unpaired electrons is

A
$\mathrm{Ti}^{3+}, \mathrm{Mn}^{2+}$
B
$\mathrm{Ti}^{2+}, \mathrm{Co}^{2+}$
C
$\mathrm{Fe}^{3+}, \mathrm{Cr}^{2+}$
D
$\mathrm{V}^{2+}, \mathrm{Co}^{2+}$
2
JEE Main 2025 (Online) 3rd April Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Given below are two statements:

Statement I : $\mathrm{CrO}_3$ is a stronger oxidizing agent than $\mathrm{MoO}_3$

Statement II : $\mathrm{Cr}(\mathrm{VI})$ is more stable than $\mathrm{Mo}(\mathrm{VI})$

In the light of the above statements, choose the correct answer from the options given below

A
Statement I is true but Statement II is false
B
Both Statement I and Statement II are true
C
Both Statement I and Statement II are false
D
Statement I is false but Statement II is true
3
JEE Main 2025 (Online) 3rd April Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The metal ions that have the calculated spin-only magnetic moment value of 4.9 B.M. are :

A. $\mathrm{Cr}^{2+}$

B. $\mathrm{Fe}^{2+}$

C. $\mathrm{Fe}^{3+}$

D. $\mathrm{Co}^{2+}$

E. $\mathrm{Mn}^{3+}$

Choose the correct answer from the options given below:

A
A, D and E Only
B
A, B and E Only
C
A, C and E Only
D
B and E Only
4
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

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