JEE Main 2019 (Online) 12th April Evening Slot | Solid State Question 41 | Chemistry

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 :

$$a$$

$${3 \over 2}a$$

$${a \over 2}$$

$$\sqrt 2 a$$

JEE Main 2019 (Online) 9th April Evening Slot

MCQ (Single Correct Answer)

-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?

1.0 pm

2.0 nm

0.1 nm

2.0 pm

JEE Main 2019 (Online) 8th April Evening Slot

MCQ (Single Correct Answer)

-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]

10^–8 m

10^–2 m

10^–4 m

10^–6 m

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