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The Solid State

Short Answer Type

211. What is the maximum possible coordination number of an atom in an hcp crystal structure of an element?

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212. How many atoms can be assigned to its unit cell if an element forms
(i) a body centred cubic cell, and (ii) a face centred cubic cell?

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213. Name an element with which germanium can be doped to produce an n-type semiconductor.

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214. What is the nature of crystal defect produced when sodium chloride is doped with MgCl₂?

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215. What happens when a ferromagnetic substance is subjected to high temperature?

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216. Name a substance which on addition to AgCl causes cation vacancy in it.

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217. What makes alkali metal halides sometimes coloured, which are otherwise colourless?

Alkali metal halides have anionic sites occupied by unpaired electrons. These are called F-centres, and impart colour to the crystals of alkali metal halides. For example, the excess of lithium in LiCl makes it pink.

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218. Define the term ‘amorphous’.

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219. Which point defect lowers the density of a crystal?

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220. What is coordination number of a metal atom in ccp structure?

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