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Following figure shows an FCC unit cell with atoms of radius r marked (1corner ), 2(face center), 3(face center). A quadrilateral is also shown by joining the centers of 4 face centered atoms. Find:
(i) The distances between atoms 1& 2, 2 & 3 and 1 & 3.
(ii) The shape and dimensions of the quadrilateral.

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Important Questions on Solid State

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Alpha Question Bank for Engineering: Chemistry>Chapter 7 - Solid State>Exercise-1>Q 12
"Tom" cat arranges the glass balls, in a particular 3D array; that two (I and II) continuous layer are not identical, but all ( I and II ) alternative layers are identical, this type of arrangement is known as:
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Alpha Question Bank for Engineering: Chemistry>Chapter 7 - Solid State>Exercise-1>Q 13
A student wants to arrange 4 identical spheres (of radius R) on a two dimensional floor as close as possible.Finally he could arrange them.Identify the type and dimensions of the figure obtained by joining their centers. Could he occupy the whole available space, if not, then what type of voids were generated.Calculate their number and radius of small ball that can be fitted in them.
 
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Alpha Question Bank for Engineering: Chemistry>Chapter 7 - Solid State>Exercise-1>Q 22
Account for the following:
Silicon is an insulator, but silicon doped with phosphorus acts as a semiconductor.
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Alpha Question Bank for Engineering: Chemistry>Chapter 7 - Solid State>Exercise-1>Q 25
The smallest repeating pattern which when repeated in three dimensions results in the crystal of the substance is called
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Alpha Question Bank for Engineering: Chemistry>Chapter 7 - Solid State>Exercise-1>Q 27
Which of the following are the correct axial distance and axial angles for the rhombohedral system?
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Alpha Question Bank for Engineering: Chemistry>Chapter 7 - Solid State>Exercise-1>Q 29
The crystal system of a compound with unit cell dimensions a=0.387, b=0.387 and c=0.504nm and α=β=90° and γ=120° is
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Alpha Question Bank for Engineering: Chemistry>Chapter 7 - Solid State>Exercise-1>Q 31
A metal crystallizes in a body centred cubic lattice (bcc) with the edge of the unit cell 5.2 A°. The distance between the two nearest neighbour is:
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Alpha Question Bank for Engineering: Chemistry>Chapter 7 - Solid State>Exercise-1>Q 32

At room temperature, Polonium crystallises in cubic primitive cell. If edge length is 3.0 A°. Calculate the theoretical density of Po. (Atomic wt of P0=207 g)