1
JEE Main 2019 (Online) 9th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
Which of the following conditions in drinking water causes methemoglobinemia?
A
> 50 ppm of lead
B
> 50 ppm of chloride
C
> 50 ppm of nitrate
D
> 100 ppm of sulphate
2
JEE Main 2019 (Online) 9th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
The metal that forms nitride by reacting directly with N2 of air, is :
A
K
B
Li
C
Rb
D
Cs
3
JEE Main 2019 (Online) 9th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
The correct match between Item I and Item II is :

Item - I Item - II
(A) Benzaldehyde (P) Mobile phase
(B) Alumina (Q) Adsorbent
(C) Acetonitrile (R) Adsorbate
A
(A) $$ \to $$ (Q); (B) $$ \to $$ (P); (C) $$ \to $$ (R)
B
(A) $$ \to $$ (R); (B) $$ \to $$ (Q); (C) $$ \to $$ (P)
C
(A) $$ \to $$ (Q); (B) $$ \to $$ (R); (C) $$ \to $$ (P)
D
(A) $$ \to $$ (P); (B) $$ \to $$ (R); (C) $$ \to $$ (Q)
4
JEE Main 2019 (Online) 9th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
For coagulation of arsenious sulphate sol, which one of the following salt solution will be most effective ?
A
BaCl2
B
AlCl3
C
NaCl
D
Na3PO4
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