1
JEE Main 2022 (Online) 27th June Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A) : The ionic radii of O2$$-$$ and Mg2+ are same.

Reason (R) : Both O2$$-$$ and Mg2+ are isoelectronic species.

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

A
Both (A) and (R) are true and (R) is the correct explanation of (A).
B
Both (A) and (R) are true but (R) is not the correct explanation of (A).
C
(A) is true but (R) is false.
D
(A) is false but (R) is true.
2
JEE Main 2022 (Online) 25th June Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The correct order of electron gain enthalpies of Cl, F, Te and Po is

A
F < Cl < Te < Po
B
Po < Te < F < Cl
C
Te < Po < Cl < F
D
Cl < F < Te < Po
3
JEE Main 2021 (Online) 1st September Evening Shift
MCQ (Single Correct Answer)
+4
-1
Identify the element for which electronic configuration in +3 oxidation state is [Ar]3d5 :
A
Ru
B
Mn
C
Co
D
Fe
4
JEE Main 2021 (Online) 31st August Evening Shift
MCQ (Single Correct Answer)
+4
-1
The Eu2+ ion is a strong reducing agent in spite of its ground state electronic configuration (outermost) : [Atomic number of Eu = 63]
A
4f76s2
B
4f6
C
4f7
D
4f66s2
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