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Chemistry Class 12: The Solid State - Solids and Types

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Chemistry Class 12: The Solid State - Solids and Types

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Questions and Answers

What is the equation called when X-rays are diffracted by a crystal plane?

Bragg’s equation

What does the variable 'n' represent in Bragg’s equation?

The diffraction order

What does 'd' represent in Bragg’s equation?

Distance between atomic planes

What is the smallest geometrical portion of a crystal lattice called?

Unit cell Signup and view all the answers

What is the coordination number of atoms in a primitive cubic unit cell?

6 Signup and view all the answers

What is the coordination number of atoms in a face centred cubic unit cell?

12 Signup and view all the answers

What is the coordination number of atoms in a body centred cubic unit cell?

8 Signup and view all the answers

What is the packing fraction of a primitive cubic unit cell?

52.4% or 0.524 Signup and view all the answers

What is the packing fraction of a face centred cubic unit cell?

74% or 0.74 Signup and view all the answers

What is the packing fraction of a body centred cubic unit cell?

68% or 0.68 Signup and view all the answers

What are the characteristics of solids?

Defined shape and volume, rigidity, high density, low compressibility Signup and view all the answers

What are the two types of solids?

Crystalline solids and amorphous solids Signup and view all the answers

How do crystalline solids differ from amorphous solids?

Crystalline solids have a definite and regular arrangement of constituent particles, while amorphous solids do not have any regular arrangement. Signup and view all the answers

What are the properties of crystalline solids?

Long order arrangement of particles, anisotropic nature, sharp melting points Signup and view all the answers

How do amorphous solids differ from crystalline solids in terms of cleavage?

Amorphous solids undergo irregular cleavage when cut, while crystalline solids undergo clean cleavage. Signup and view all the answers

What are the physical properties of amorphous solids?

Isotropic in nature, melt over a range of temperature Signup and view all the answers