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1
JEE Main 2019 (Online) 10th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
The noble gas that does not occur in the atmosphere is :
A
Ne
B
He
C
Kr
D
Ra
2
JEE Main 2019 (Online) 10th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
The number of pentagons in C60 and trigons (triangles) in white phosphorus, respectively, are :
A
12 and 3
B
20 and 3
C
20 and 4
D
12 and 4
3
JEE Main 2019 (Online) 10th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
The correct order of catenation is :
A
C > Sn > Si $$ \approx $$ Ge
B
Si > Sn > C > Ge
C
C > Si > Ge $$ \approx $$ Sn
D
Ge > Sn > Si > C
4
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
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