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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?

When ferromagnetic substance is subjected to high temperature it loses its magnetic property and become paramagnetic in nature this happen due to disorder ness in electronic arrangment.

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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?

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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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