This chapter is currently out of syllabus
1
JEE Main 2019 (Online) 12th April Morning Slot
MCQ (Single Correct Answer)
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Out of Syllabus
An element has a face-centred cubic (fcc) structure with a cell edge of $$a$$. The distance between the centres of
two nearest tetrahedral voids in the lattice is :
2
JEE Main 2019 (Online) 9th April Evening Slot
MCQ (Single Correct Answer)
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Out of Syllabus
10 mL of 1mM surfactant solution forms a
monolayer covering 0.24 cm2 on a polar
substrate. If the polar head is approximated as
cube, what is its edge length?
3
JEE Main 2019 (Online) 8th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
0.27 g of a long chain fatty acid was dissolved
in 100 cm3 of hexane. 10 mL of this solution
was added dropwise to the surface of water in
a round watch glass. Hexane evaporates and a
monolayer is formed. The distance from edge
to centre of the watch glass is 10 cm. What is
the height of the monolayer?
[Density of fatty acid = 0.9 g cm–3, $$\pi $$ = 3]
[Density of fatty acid = 0.9 g cm–3, $$\pi $$ = 3]
4
JEE Main 2019 (Online) 8th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Consider the bcc unit cells of the solids 1 and
2 with the position of atoms as shown below.
The radius of atom B is twice that of atom A.
The unit cell edge length is 50% more in solid
2 than in 1. What is the approximate packing
efficiency in solid 2?

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