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The Solid State

Multiple Choice Questions

201. The presence of F-centres in a solid makes it

conducting
colourless
coloured
non-conducting

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202. Most crystals show good cleavage because their atoms, ions and molecules are

Weakly bonded together
strongly bonded together
spherically symmetrical
arranged in planes.

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203. The available space occupied by spheres of equal size in three dimensions in both hcp and ccp arrangements is:

74%
70%
60.4%
52.4%

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204. The tetrahedral voids formed by ccp arrangement of CI^– ions in rock salt structure are:

Occupied by Na⁺ ions
Occupied by CI^– ions
Occupied by either Na⁺ or CI^– ions
Vacant

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205. CsCl has which type of lattice?

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206. If the distance between Na⁺ and CI^– ions in NaCl crystal is a pm, what is the length of the cell edge?

2a pm
a / 2 pm
4a pm
a/4 pm

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207. A compound is formed by elements A and B. This crystallises in the cubic structure when atoms A are at the corners of the cube and atoms B are at the centre of the body. The simplest formula of the compound is:

AB
AB₂
A₂B
AB₄

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Short Answer Type

208. Name the crystal defect which lowers the density of an ionic crystal

Density of crystal is lowered by shottky defect.

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209. What makes the crystal of KCl appear sometimes violet?

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210. What is the effect of Schottky and Frenkel defects on the density of crystalline solids?

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