This chapter is currently out of syllabus
1
JEE Main 2019 (Online) 12th April Morning Slot
+4
-1
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 :
A
$$a$$
B
$${3 \over 2}a$$
C
$${a \over 2}$$
D
$$\sqrt 2 a$$
2
JEE Main 2019 (Online) 9th April Evening Slot
+4
-1
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?
A
1.0 pm
B
2.0 nm
C
0.1 nm
D
2.0 pm
3
JEE Main 2019 (Online) 8th April Evening Slot
+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]
A
10–8 m
B
10–2 m
C
10–4 m
D
10–6 m
4
JEE Main 2019 (Online) 8th April Evening Slot
+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?
A
45%
B
90%
C
75%
D
65%
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