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प्रश्न
You are provided with a mixture of naphthalene and ammonium chloride by your teacher. Suggest an activity to separate them with well labelled diagram.
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उत्तर
A mixture of naphthalene and ammonium chloride can be separated as follows :
Step-1: Put the mixture in a beaker and add water to it. Stir with a glass rod. Ammonium chloride is soluble in water gets dissolved leaving behind the insoluble naphthalene.
Step-2: Filter the solution. Naphthalene remains on the filter paper while ammonium chloride is obtained as filtrate.
Step-3: Evaporate the filtrate to get back ammonium chloride.
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संबंधित प्रश्न
Give reason for the following.
Pure substances have fixed melting or boiling points.
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All matter is made up of tiny particles called..................
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Liquids have no definite ............
Write whether the following statement is true or false.
All solids, on heating, first change to the liquid and then to the gaseous state always.
For the following statement, say whether it describe a solid, a liquid or a gas.
Particles are quite close together.
Name the three states of matter and define them.
Give reason of The odour of scent spreads in a room.
Write whether the following statement are true or false.
Intermolecular force of attraction is greater in gases than in liquids.
Differentiate the general properties of solids, liquids and gases in the form of a table — with reference to free surfaces.
Match the characteristics of the three states of matter in List I with their correct answer from List II.
| List I | List II |
| 1. Have no definite shape, volume or free surface | A: Solids only |
| 2. Are highly compressible and least rigid | B: Liquids only |
| 3. Have a definite volume, no definite shape and are slightly diffusable | C: Gases only |
| 4. Are not compressible and have no diffusability | D: Liquids and gases only |
| 5. Have mass and occupy space | E: Solids and gases only |
| F: Solids, liquids and gases |
