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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
Change Language

Which one of the lanthanoids given below is the most stable in divalent form?

A
Ce (Atomic Number 58)
B
Sm (Atomic number 62)
C
Eu (Atomic Number 63)
D
Yb (Atomic Number 70)
3
JEE Main 2022 (Online) 27th June Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
The 'f' orbitals are half and completely filled, respectively in lanthanide ions :

[Given : Atomic no. Eu, 63; Sm, 62; Tm, 69; Tb, 65; Yb, 70; Dy, 66]

A
Eu2+ and Tm2+
B
Sm2+ and Tm3+
C
Tb4+ and Yb2+
D
Dy3+ and Yb3+
4
JEE Main 2022 (Online) 26th June Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The most common oxidation state of Lanthanoid elements is +3. Which of the following is likely to deviate easily from +3 oxidation state?

A
Ce (At. No. 58)
B
La (At. No. 57)
C
Lu (At. No. 71)
D
Gd (At. No. 64)
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