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प्रश्न
Name the process by which the various gases of the air are separated.
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उत्तर
Various gases of air are separated by fractional distillation.
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संबंधित प्रश्न
Fill in the blank
All matter is made up of tiny particles called ______
Out of solids, liquids and gases, which one has :
- maximum movement of particles ?
- maximum interparticle attractions ?
- minimum spaces between particles ?
Fill in the following blank with suitable words :
The best evidence that the particles of matter are constantly moving comes from the studies of ................. and ...................
What elements do the following compounds contain ?
Sugar, Common salt
Name a metal which forms amalgams.
On the basis of composition of matter, milk is considered to be :
Out of a colloid, solution and a suspension :
which one has the smallest particles ?
What is the concentration of a solution which contains 16 g of urea in 120 g of solution ?
What do you understand by the statement " the solubility of copper sulphate in water at 20°C is 20.7 g" ?
One of the following does not show Tyndall effect. This one is :
When the solid A is added to water, it dissolves with the evolution of a lot of heat and making little explosions to form two products B and C. The properties of products B and C are entirely different from those of solid A as well as water. Moreover, products B and C cannot be reconverted into solid A and water. When another solid D is added to water, it dissolves with the absorption of a little heat to form a product E which cools down. The product E shows the properties of both, solid D as well as water. Moreover, product E can be converted into solid D and water.
(a) What type of change occurs when solid A is dissolved in water ? Why ?
(b) What type of change occurs when solid D is dissolved in water ? Why ?
(c) Name a metal which you think could behave like solid A. Also name the products B and C.
(d) Name the solid D if it is the one which is used in making ordinary dry cells.
(e) Name the process by which D can be recovered from E.
Name the process by which common salt is obtained from sea-water.
Which technique can be used to detect and identify traces of poison present in the stomach wash of a person ?
Write a method to separate a mixture of sand and potash alum.
Which of the following statements are true for pure substances?
(i) Pure substances contain only one kind of particles
(ii) Pure substances may be compounds or mixtures
(iii) Pure substances have the same composition throughout
(iv) Pure substances can be exemplified by all elements other than nickel
Solid is an arrangement of particles ______.
Evaporation is always accompanied by ______ in temperature.
Define the term matter.
Write a scientific reason.
Lemon sherbat has sweet, sour and salty taste and it can be poured in a glass.
