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प्रश्न
What are pure substances ? Give two examples of pure substances.
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उत्तर
Pure substances are made up of same type of particles or atoms. All the elements and compounds are pure substances because they contain the same kinds of particles.
Examples: Hydrogen, carbon dioxide
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संबंधित प्रश्न
All kinds of matter
Which of the following is a mixture ?
Salt, Air, Water, Alum, Sugar
Fill in the following blanks with suitable words :
The elements which are sonorous are called ..........................
Define solvent.
What is meant by the concentration of a solution ?
What will happen if a saturated solution is :
- heated
- cooled
One of the following represents the solution of solid in a solid. This one is :
Name the property of one of the constituents which can be used to separate a mixture of salt and iodine
What difference in the property of two miscible liquids enables their separation by fractional distillation ?
State whether the following statement are true or false :
Alcohol can be separated from a mixture of alcohol and water by a separating funnel.
A carpenter wants to separate iron nails from saw-dust. Which method of separation should he choose ?
Name the process you would use to separate a mixture of water and alcohol.
How is water purified on a large scale at water works ? Explain with the help of a labelled diagram. Name the substance which is added to kill germs in the drinking water supply ?
The liquid air has three components X, Y and Z whose boiling points are : –186°C, –183°C and –196°C,
respectively. When liquid air is fed into a tall fractional distillation column from near its bottom and warmed
up slowly :
(a) Which component will be collected from near the bottom of the fraction distillation column ? Why ?
(b) Which component will be collected from the top part of the fractional distillation column ? Why ?
(c) Which component will be collected from the middle part of the fractional distillation column ? Why ?
(d) What could the component X, Y and Z be ?
Justify your answer.
| Figure 1 | Figure 2 | Figure 3 |
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 |
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The arrangement of particles in three different phases of matter is shown above.
- Which state is represented by Fig. 1?
- In which state will the inter-particle attraction be maximum?
- Which one of them cannot be contained in an open vessel?
- Which one can take the shape of its container?
Stars including Sun are covered in ______.
A standard sheet of paper is about ______ of atoms thick
In Aerosol the dispersed phase is liquid and the dispersion medium is gas.
Celsius scale is a scale of temperature in which zero represents the melting point of ice and 100 represents the boiling point of water.
Define the term matter.
