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The Solid State

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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?

2Na⁺ will replaced by Mg²⁺ ion to maintain electrical neutrality thus ahole created for lattice site for every Mg²⁺ ion introduce thus the defect produced will schottky defect

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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?

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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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Short Answer Type

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

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