# CLASS-XII

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# SOLID STATE

## Classification of solids

Assignment 1.Classify each of the following solids as crystalline or amorphous solid.

  Diamond, Glass, Graphite, Quartz


2.Differentiate between crystalline and amorphous solid?

## Types of crystalline solids

1. In crystalline solids the constituent particles are

 irregular arrangement regular arrangement both regular and irregular arrangement neither regular and irregular arrangement

2. The crystalline solid which is good conductor in solid and molten state is

 ionic solid covalent solid molecular solid metallic solid

3. Identify the solid which is bad conductor of electricity in solid state but good conductor of electricity in molten state

 covalent solid ionic solid molecular solid metallic solid

4. which solid is soluble in polar solvent but insoluble in non polar solvent

 ionic solid covalent solid metallic solid molecular solid

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## Close packing

Assignment


1.What the full form of hcp and ccp structure? 2.What is the coordination number of sphere in ccp structure? 3.Which has higher coordination number square close packing or hexagonal close packing? 4.Name the close packed structure in which first layer is similar to third layer? 5.Define coordination number.

## Voids

1.What is the relationship between tetrahedral and octahedral voids? 2.How many octahedral voidsare there in 1 mole of compound having ccp structure? 3.What is the coordination number of an tetrahedral and octahedral void?

## Types of unit cell

1.Draw the shapes of following unit cells (1) simple cubic, (2)face-centered cubic, (3) body centered cubic 2.How many atoms are present per unit cell face centered unit cell? 3.In a cubic unit cell, atoms are present at the corners and one atom is present at the centre of a cube.How many are present per unit cell?