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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
When sodium chloride is added to a definite volume of water and stirred well, a solution is formed, but there is no increase in the level of water. Why?
Classify the following into solids, liquids and gases.
Oxygen, milk, common salt, wax, stone, water vapour, carbon-dioxide, sugar, mercury, coal, blood, butter, copper, coconut oil, kerosene.
Write whether the following statement is true or false.
Solids have the largest inter-molecular space.
Write whether the following statement is true or false.
A gas has no free surface.
Match the following
| Column A | Column B |
| (a) Solids | (1) Can flow in all directions. |
| (b) Sublimation | (2) The temperature at which a liquid changes into its gaseous state. |
| (c) Boiling point | (3) Any number of free surfaces. |
| (d) Gases | (4) Gaps between particles. |
| (e) Intermolecular space | ro(5) Change of state fm solid to gas. |
Gases
- cannot be compressed easily,
- occupy the entire space of the container.
- have definite shapes.
- cannot flow.
There are large intermolecular gaps in
Give reasons for the following:
Water on freezing turns into ice.
Differentiate the general properties of solids, liquids and gases in the form of a table — with reference to free surfaces.
Give a reason why –
Liquids have a definite volume but no definite shape.
