1
JEE Main 2020 (Online) 6th September Morning Slot
MCQ (Single Correct Answer)
+4
-1
The lanthanoid that does NOT show +4 oxidation state is :
A
Tb
B
Dy
C
Ce
D
Eu
2
JEE Main 2020 (Online) 6th September Morning Slot
MCQ (Single Correct Answer)
+4
-1
The set that contains atomic numbers of only transition elements, is :
A
21, 32, 53, 64
B
9, 17, 34, 38
C
37, 42, 50, 64
D
21, 25, 42, 72
3
JEE Main 2020 (Online) 9th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
5 g of zinc is treated separately with an excess of

(a) dilute hydrochloric acid and
(b) aqueous sodium hydroxide.

The ratio of the volumes of H2 evolved in these two reactions is :
A
1 : 2
B
1 : 1
C
1 : 4
D
2 : 1
4
JEE Main 2020 (Online) 8th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
When gypsum is heated to 393 K, it forms :
A
CaSO4 . 0.5H2O
B
CaSO4 . 5H2O
C
Dead burnt plaster
D
Anhydrous CaSO4
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