1
JEE Main 2019 (Online) 10th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
A compound of formula A2B3 has the hcp lattice. Which atom forms the hcp lattice and what fraction of tetrahedral voids is occupied by the other atoms :
A
hcp lattice - A, $${1 \over 3}$$ Tetrahedral voids-B
B
hcp lattice - B, $${1 \over 3}$$ Tetrahedral voids - A
C
hcp lattice - A, $${2 \over 3}$$ Tetrahedral voids - B
D
hcp lattice - B, $${2 \over 3}$$ Tetrahedral voids - A
2
JEE Main 2019 (Online) 10th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
Among the following reactions of hydrogen with halogens, the one that requires a catalyst is :
A
H2 + Br2 $$ \to $$ 2HBr
B
H2 + Cl2 $$ \to $$ 2HCl
C
H2 + F2 $$ \to $$ 2HF
D
H2 + I2 $$ \to $$ 2HI
3
JEE Main 2019 (Online) 10th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
The electrolytes usually used in the electroplating of gold and silver, respectively are :
A
[Au(CN)2] and [Ag(CN)2]
B
[Au(CN)2] and [Ag(Cl)2]
C
[Au(OH)4] and [Ag(OH)2]
D
[Au(NH3)2] and [Ag(CN)2]
4
JEE Main 2019 (Online) 10th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
Which of the following tests cannot be used for identifying amino acids?
A
Ninhydrin test
B
Barfoed test
C
Xanthoproteic test
D
Biuret test
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