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प्रश्न
Give some examples of the Tyndall effect observed in your surroundings?
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उत्तर
Examples of the Tyndall effect:
- When light rays enter into a dark room through a hole or a small window.
- Sunlight passes through a group of trees in the forest.
- Path of light rays seen in front of the projector in a cinema hall.
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संबंधित प्रश्न
Fill in the blank :
The substances which can flow are called ________
Name the terms for the change of vapour into a liquid.
Classify the following into elements, compounds and mixtures:
- Sodium
- Soil
- Sugar solution
- Silver
- Calcium carbonate
- Tin
- Silicon
- Coal
- Air
- Soap
- Methane
- Carbon dioxide
- Blood
When a crystal of potassium permanganate is placed in a beaker, its purple colour spreads throughout the water. What does this observation tell us about the nature of potassium permanganate and water?
Name a metal which is soft and a non-metal which is hard.
Which of the following are ‘pure substances’ ?
Ice, Milk, Iron, Hydrochloric acid, Calcium oxide, Mercury, Brick, Wood, Air
What is the other name for impure substances ? Give two examples of impure substances.
Classify the following into metals, non-metals and metalloids:
Silicon, Mercury, Diamond, Sulphur, Iodine, Germanium, Sodium, Carbon, Magnesium, Copper, Boron, Helium
Which one of the following is not a metalloid ?
What will happen if a saturated solution is :
- heated
- cooled
Name the process which can be used to purify an impure sample of copper sulphate.
Name the process by which all the dye can be recovered from black ink.
Fill in the following blanks with suitable words :
If a mixture contains iron filings as one of the constituents, it can be separated by using a .......................
Explain how, impure copper sulphate can be purified by crystallisation.
What is fractional distillation ? What is the use of fractionating column in fractional distillation ?
Explain how, nitrogen , oxygen and argon gases are separated from air.
The material which is added to water during purification process at the water works so as to disinfect it is :
All the matter made of ______.
Define the term matter.
