1
JEE Main 2020 (Online) 9th January Morning Slot
Numerical
+4
-0
Change Language
The mass percentage of nitrogen in histamine is _____.
Your input ____
2
JEE Main 2020 (Online) 9th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
If enthalpy of atomisation for Br2(1) is x kJ/mol and bond enthalpy for Br2 is y kJ/mol, the relation between them :
A
does not exist
B
is x < y
C
is x > y
D
is x = y
3
JEE Main 2020 (Online) 9th January Morning Slot
Numerical
+4
-0
Change Language
The hardness of a water sample containing 10–3 M MgSO4 expressed as CaCO3 equivalents (in ppm) is ______.
(molar mass of MgSO4 is 120.37 g/mol)
Your input ____
4
JEE Main 2020 (Online) 9th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
Which of these will produce the highest yield in Friedel Crafts reaction?
A
JEE Main 2020 (Online) 9th January Morning Slot Chemistry - Haloalkanes and Haloarenes Question 137 English Option 1
B
JEE Main 2020 (Online) 9th January Morning Slot Chemistry - Haloalkanes and Haloarenes Question 137 English Option 2
C
JEE Main 2020 (Online) 9th January Morning Slot Chemistry - Haloalkanes and Haloarenes Question 137 English Option 3
D
JEE Main 2020 (Online) 9th January Morning Slot Chemistry - Haloalkanes and Haloarenes Question 137 English Option 4

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