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10 mL of 1mM surfactant solution forms a
monolayer covering 0.24 cm

^{2}on a polar substrate. If the polar head is approximated as cube, what is its edge length?2

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0.27 g of a long chain fatty acid was dissolved
in 100 cm

[Density of fatty acid = 0.9 g cm

^{3}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]3

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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?

4

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Element 'B' forms ccp structure and 'A' occupies half of the octahedral voids, while oxygen atoms
occupy all the tetrahedral voids, The structure of bimetallic oxide is :

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