1
JEE Main 2021 (Online) 25th July Morning Shift
MCQ (Single Correct Answer)
+4
-1
The correct order of following 3d metal oxides, according to their oxidation numbers is :
(a) CrO3, (b) Fe2O3, (c) MnO2, (d) V2O5, (e) Cu2O
(a) CrO3, (b) Fe2O3, (c) MnO2, (d) V2O5, (e) Cu2O
2
JEE Main 2021 (Online) 25th July Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Which one of the following chemical agent is not being used for dry-cleaning of clothes?
3
JEE Main 2021 (Online) 25th July Morning Shift
MCQ (Single Correct Answer)
+4
-1
Which one of the following compounds will liberate CO2, when treated with NaHCO3 ?
A
$${(C{H_3})_3}\mathop {NH}\limits^ \oplus \mathop {Cl}\limits^\Theta $$
B
$${(C{H_3})_4}\mathop N\limits^ \oplus \mathop O\limits^\Theta H$$
C
D
$$C{H_3}N{H_2}$$
4
JEE Main 2021 (Online) 25th July Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
In the leaching of alumina from bauxite, the ore expected to leach out in the process by reacting with NaOH is :
Paper analysis
Total Questions
Chemistry
30
Mathematics
30
Physics
30
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