Advertisements
Advertisements
प्रश्न
Describe a method to separate a mixture of camphor and sand.
Advertisements
उत्तर
Sublimation method is used to separate a mixture of camphor and sand. Camphor is a volatile solid and can be separated from any other non-volatile substance by heating. Sand is a non-volatile substance. When a mixture of sand and camphor is heated, sand will remain in the container but camphor will vaporise. These vapours are collected and condensed on a cold surface.
APPEARS IN
संबंधित प्रश्न
What are molecules ?
All kinds of matter
When a gas jar containing air is inverted over a gas jar containing bromine vapour, the red-brown bromine vapour diffuse into air. Explain how bromine vapour diffuse into air.
Explain why, osmosis can be considered to be a special kind of diffusion. Classify the following into
(i) osmosis, and (ii) diffusion :
- swelling up of a raisin on keeping in water
- spreading of virus on sneezing
- earthworm dying on coming in contact with common salt
- shrinking of grapes kept in thick sugar syrup
- preserving of pickles in salt
- spreading of smell of cake being baked in the kitchen
- aquatic animals using oxygen dissolved in water during respiration
When extremely small particles X derived from the anther of a flower were suspended in a liquid Y and observed through a microscope, it was found that the particles X were moving throughout the liquid Y in a very zig-zag way. It was also observed that warmer the liquid Y, faster the particles X moved on its surface.
- What could particles X be ?
- What do you think liquid Y is ?
- What is the zig-zag movement of X known as ?
- What is causing the zig-zag movement of particles X ?
- Name the scientist who discovered this phenomenon.
- What does this experiment tell us about the nature of liquid Y?
Name a metal which is soft and a non-metal which is hard.
Name a non-metal which is a good conductor of electricity.
Name a metal which can be easily cut with a knife.
Out of a colloid, solution and a suspension :
which one has the smallest particles ?
Out of a colloid, solution and a suspension :
which one has the largest particles ?
What is the name of the clear liquid formed when a solid dissolves in a liquid ?
Define solvent.
How would you separate iodine from a mixture of iodine and common salt ?
What is fractional distillation ? What is the use of fractionating column in fractional distillation ?
Which of the following mixture cannot be separated by using water as the solvent ?
The given mixture contains three constituents A, B and C. The constituent A is a yellow coloured, solid element which dissolves in a liquid D. The constituent B is a blue coloured salt which is insoluble in liquid D but dissolves easily in another liquid E. The constitudent C is a liquid which is used in cooking food and forms a solid fat on hydrogenation.
(a) What do you think could (i) constituent A, and (ii) liquid D be ?
(b) What could (i) constituent B, and (ii) liquid E be ?
(c) What could liquid C be ?
(d) How will you separate the mixture containing A, B and C ?
Define the term matter.
State whether true or false. If false, correct the statement.
Oil and water are immiscible with each other.
Solids possess very high kinetic energy.
Solids do not flow.
