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1
JEE Main 2019 (Online) 11th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
The correct statements among (a) to (d) regarding H2 as a fuel are :

(a)   It produces less pollutants than petrol.

(b)   A cylinder of compressed dihydrogen weighs $$ \sim $$ 30 times more than a petrol tank producing the same amount of energy.

(c)   Dihydrogen is stored in tanks of metal alloys like NaNi5.

(d)   On combustion, values of energy released per gram of liquid dihydrogen and LPG are 50 and 142 KJ, respectively.
A
(a) and (c) only
B
(b) and (d) only
C
(a), (b) and (c) only
D
(b), (c) and (d) only
2
JEE Main 2019 (Online) 10th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
The chemical nature of hydrogen peroxide is :
A
Oxidising agent in acidic medium, but not in basic medium
B
Oxidising and reducing agent in both acidic and basic medium
C
Reducing agent in basic medium, but not in acidic medium
D
Oxidising and reducing agent in acidic medium, but not in basic medium.
3
JEE Main 2019 (Online) 10th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
The total number of isotopes of hydrogen and number of radioactive isotopes among them, respectively, are :
A
3 and 2
B
2 and 1
C
2 and 0
D
3 and 1
4
JEE Main 2019 (Online) 9th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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The temporary hardness of water is due to :
A
Na2SO4
B
NaCl
C
Ca(HCO3)2
D
CaCl2
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