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1
JEE Main 2022 (Online) 29th June Morning Shift
MCQ (Single Correct Answer)
+4
-1
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The electronic configuration of Pt (atomic number 78) is:

A
[Xe] 4f14 5d9 6s1
B
[Kr] 4f14 5d10
C
[Xe] 4f14 5d10
D
[Xe] 4f14 5d8 6s2
2
JEE Main 2022 (Online) 28th June Morning Shift
MCQ (Single Correct Answer)
+4
-1
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Element "E" belongs to the period 4 and group 16 of the periodic table. The valence shell electron configuration of the element, which is just above "E" in the group is

A
3s2, 3p4
B
3d10, 4s2, 4p4
C
4d10, 5s2, 5p4
D
2s2, 2p4
3
JEE Main 2022 (Online) 27th June Evening Shift
MCQ (Single Correct Answer)
+4
-1
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The correct order of increasing ionic radii is

A
Mg2+ < Na+ < F$$-$$ < O2$$-$$ < N3$$-$$
B
N3$$-$$ < O2$$-$$ < F$$-$$ < Na+ < Mg2+
C
F$$-$$ < Na+ < O2$$-$$ < Mg2+ < N3$$-$$
D
Na+ < F$$-$$ < Mg2+ < O2$$-$$ < N3$$-$$
4
JEE Main 2022 (Online) 27th June Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
English
Hindi

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.
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