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प्रश्न
How would you confirm that a colourless liquid given to your is pure water ?
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उत्तर
You can boil it and if it starts boiling at 100⁰ C, it might be water. You can also check its reactivity with some metals such as sodium and potassium that react violently with water. The best way, to prove that it is pure water, is to do experiments to see if it has the same capabilities and chemical behaviour as water has.
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संबंधित प्रश्न
The smallest unit of matter that exists freely in nature is called ...........
Which of the following materials fall in the category of a “pure substance”?
- Ice
- Milk
- Iron
- Hydrochloric Acid
- Calcium oxide
- Mercury
- Brick
- Wood
- Air
The elements which normally exist in the liquid state are :
Fill in the following blank :
A colloid is a ..............mixture and its components can be separated by the technique known as ...............
What is the difference between solutions and colloids ?
What difference in the property of two miscible liquids enables their separation by fractional distillation ?
Name the source from which nitrogen and oxygen are obtained on a large scale.
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 ?
How will you separate a mixture of iron filings, chalk powder and common salt ?
What is chromatography ? State its two applications.
Pure copper sulphate can be obtained from an impure sample by the process of :
Which of the following cannot be separated from air by the process of fractional distillation ?
Which one of the following scrap metal cannot be separated by magnetic separation ?
Explain the meaning of the term matter with special reference to the term ‘substance’.
Asmita went to buy an earthen pot. There she saw many things kept for sale.
How did she identify what she needed?
A standard sheet of paper is about ______ of atoms thick
What type of matter glass is?
Define the term matter.
Define the term matter.
