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प्रश्न
Fill in the following blanks with suitable words :
A mixture of kerosene and petrol can be separated by .....................
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उत्तर
A mixture of kerosene and petrol can be separated by fractional distillation.
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संबंधित प्रश्न
Match the following
| Column A | Column B | ||
| (a) | Molecules | (i) | Water boils |
| (b) | 100° C | (ii) | Evaporation |
| (c) | 0° C | (iii) | Changes from solid to gas |
| (d) | At all temperatures | (iv) | Matter |
| (e) | Camphor | (v) | Water freezes |
Give one difference between atoms and molecules.
Define matter. Give four examples of matter.
During respiration, glucose and oxygen enter our body cells and waste products carbon dioxide and water leave the body cells by the process of :
Classify the following as elements or compounds :
Iron, Iron sulphide, Sulphur, Chalk, Washing soda, Sodium, Carbon, Urea
Choose the correct answer.
A 5 per cent sugar solution means that :
What happens when the temperature of a saturated sugar solution is increased ?
How will you test whether a given solution is a colloidal solution ?
You have been given a suspension and a solution. How could you tell the difference between them by their appearance ?
Classify the following into solutions, suspensions and colloids :
Soda-water, Milk, Brine, Blood, Ink, Smoke in air, Chalk water mixture, Milk of Magnesia, Shaving cream, Muddy river water.
What will happen if a saturated solution is :
- heated
- cooled
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
Which of the following represents the solubility of sugar in water at 20°C ?
Name the process which is used in milk dairies to separate cream from milk.
Describe the various steps involved in the separation of iodine, iron filings and salt from a mixture.
Stars including Sun are covered in ______.
A standard sheet of paper is about ______ of atoms thick
Gases do not diffuse very easily.
______ is used for industrial refrigeration and transporting frozen food.
Define the term matter.
