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1
JEE Main 2019 (Online) 9th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
The amorphous form of silica is :
A
kieselguhr
B
quartz
C
tridymite
D
cristobalite
2
JEE Main 2019 (Online) 9th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
C60 an allotrope of carbon contains :
A
12 hexagons and 20 pentagons.
B
20 hexagons and 12 pentagons.
C
16 hexagons and 16 pentagons
D
18 hexagons and 14 pentagons.
3
JEE Main 2019 (Online) 8th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
Diborane (B2H6) reacts with O2 and H2O independently, then products formed are :
A
B2O3 and HBO2
B
B2O3 and H3BO3
C
HBO2 and H3BO3
D
HBO2 and HBO3
4
JEE Main 2019 (Online) 12th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
Chlorine on reaction with hot and concentrated sodium hydroxide give :
A
C$$\ell $$O$$_3^ - $$ and C$$\ell $$O$$_2^ - $$
B
C$$\ell $$$$-$$ and C$$\ell $$O$$-$$
C
C$$\ell $$$$-$$ and C$$\ell $$O$$_2^ - $$
D
C$$\ell $$$$-$$ and C$$\ell $$O$$_3^ - $$
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