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प्रश्न
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.
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उत्तर
Both air and bromine vapour are made up of tiny moving particles, which collide with each other and bounce about in all directions due to which both the gas particles mix uniformly. This is an example of diffusion.
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संबंधित प्रश्न
Fill in the blank
Any matter which has a definite _______ but no definite shape is called a _______
Write true or false for each statement. Rewrite the false statement correctly.
Matter cannot exist in different states.
Which one is a kind of matter:
Which of the following materials fall in the category of a “pure substance”?
- Ice
- Milk
- Iron
- Hydrochloric Acid
- Calcium oxide
- Mercury
- Brick
- Wood
- Air
Name the property which allows metals to be hammered into thin sheets.
What is meant by saying that metals are lustrous ?
What elements do the following compounds contain ?
Sugar, Common salt
Calculate the concentration of a solution which contains 2.5 g of salt dissolved in 50 g of water.
Define the emulsion. Give one example.
Which of the following are chemical changes and which physical ? Give reason.
- a glass bottle breaking
- coal burning in air
- making a cake
- wool being knitted into a sweater
What is meant by a solution?
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 which is used in milk dairies to separate cream from milk.
Name the process by which common salt is obtained from sea-water.
How will you separate iron pins from sand ?
Explain how, impure copper sulphate can be purified by crystallisation.
Which one of the following scrap metal cannot be separated by magnetic separation ?
Define the term matter.
Rusting of an article made up of iron is called
Define the term matter.
