ï»¿ An element with molar mass 2.7 x 10–2 kg mol–1 form a cubic unit cell with edge length 405 pm. If its density is 2.7 x 103 kg m–3. What is the nature of the cubic unit cell? from Chemistry The Solid State Class 12 Nagaland Board

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An element with molar mass 2.7 x 10–2 kg mol–1 form a cubic unit cell with edge length 405 pm. If its density is 2.7 x 103 kg m–3. What is the nature of the cubic unit cell?

$\mathrm{Z}=\frac{\mathrm{d}×{\mathrm{a}}^{3}×{\mathrm{N}}_{\mathrm{A}}}{\mathrm{M}}$

Hence, the nature of the cubic unit cell is ccp.
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Why do solids have a definite volume?

A solid have a definite volume because the inter molecular distance  between its molecules are fixed.
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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.
2488 Views

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.
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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.
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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 .
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