1
JEE Main 2020 (Online) 9th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
The electronic configurations of bivalent europium and trivalent cerium are
(atomic number : Xe = 54, Ce = 58, Eu = 63)
A
[Xe] 4f7 6s2 and [Xe] 4f2 6s2
B
[Xe] 4f2 and [Xe] 4f7
C
[Xe] 4f4 and [Xe] 4f9
D
[Xe] 4f7 and [Xe] 4f1
2
JEE Main 2020 (Online) 9th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
The increasing order of basicity for the following intermediates is (from weak to strong)
JEE Main 2020 (Online) 9th January Morning Slot Chemistry - Basics of Organic Chemistry Question 215 English 1 JEE Main 2020 (Online) 9th January Morning Slot Chemistry - Basics of Organic Chemistry Question 215 English 2 JEE Main 2020 (Online) 9th January Morning Slot Chemistry - Basics of Organic Chemistry Question 215 English 3 JEE Main 2020 (Online) 9th January Morning Slot Chemistry - Basics of Organic Chemistry Question 215 English 4 JEE Main 2020 (Online) 9th January Morning Slot Chemistry - Basics of Organic Chemistry Question 215 English 5
A
(iii) < (i) < (ii) < (iv) < (v)
B
(iii) < (iv) < (ii) < (i) < (v)
C
(v) < (i) < (iv) < (ii) < (iii)
D
(v) < (iii) < (ii) < (iv) < (i)
3
JEE Main 2020 (Online) 9th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
[Pd(F)(Cl)(Br)(I)]2– has n number of geometrical isomers. Then, the spin-only magnetic moment and crystal field stabilisation energy [CFSE] of [Fe(CN)6]n–6, respectively, are:
[Note : Ignore the pairing energy]
A
1.73 BM and –2.0 $$\Delta $$0
B
5.92 BM and 0
C
2.84 BM and –1.6 $$\Delta $$0
D
0 BM and –2.4 $$\Delta $$0
4
JEE Main 2020 (Online) 9th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
If the number of five digit numbers with distinct digits and 2 at the 10th place is 336 k, then k is equal to :
A
6
B
8
C
4
D
7

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