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The Solid State

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Chemistry I

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12
What is the difference between Schottky defects and Frenkel defects?

Schottky defects

Frenkel defects

1. It arises due to vacancy at a cation site and at a nearby anion site in an ionic solid.

2. Overall density of the crystal decreases.

3. It arises in ionic solids having high co-ordination number.

4.Example: NaCl, KCl, CsCl etc.

1. It arises when a cation leaves its lattice site and enters in an interstitial site in an ionic solid.

2. There is no change in the overall density.

3. It arieses in ionic solids having large anions and small cations.

Example: ZnS, AgCl, AgI etc

Refractive index of a solid is observed to have the same value along all directions. Comment on the nature of this solid. Would it show clevage property?

Refractive index of a solid which have the same value along all directions are isotropic in nature. It would not show cleavage property.

Why is glass considred a super-cooled liquid?

Glass is amorphous solids and  have a tendency to flow, though very slowly. Therefore, these are called pseudo solids or super cooled liquids .

Classify the following as amorphous or crystalline solids: Polyurethane, naphthalene, benzoic acid, teflon, potassium nitrate, cellophane, polyvinyl chloride, fibre glass, copper.

Amorphous solids: Polyurethane, teflon, cellophane, polyvinyal chloride, fibre glass.
Crystalline solids: naphthlene, benzoic acid, potassium nitrate, copper.

Why do solids have a definite volume?

A solid have a definite volume because the inter molecular distance  between its molecules are fixed.

Why are solids rigid?

Solids are rigid because the internuclear distance between the  molecules of a solid are very less and closely packed and their positions are fixed due to the strong forces of attraction between them.