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प्रश्न
Why do we need pure substances?
उत्तर
We need pure substances because of the following reasons:
- A pure substance has a fixed melting and fixed boiling point.
- A pure substance has its characteristic taste, colour, and odour.
- Pure substances can not be broken further into more simple substances by any physical means.
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संबंधित प्रश्न
Classify each of the following as a homogeneous or heterogeneous mixture.
Soda water, wood, air, soil, vinegar, filtered tea.
Which one of the following is most likely to exhibit Tyndall effect ?
Name the process you would use to separate a mixture of anthracene and copper sulphate ?
Fill in the blanks
The substances that make a mixture are called its ______or_________.
Match the statements in List I with the correct answer in List II.
| List I | List II |
| 1. Purification of water by adding alum | A: Sublimation |
| 2. Seawater leaving behind common salt | B: Sieving |
| 3. Separation of camphor and potassium chloride | C: Filtration |
| 4. Separation of charcoal from a charcoal-water mixture | D: Sedimentation |
| 5. Separation of bran and wheat flour | E: Evaporation |
Name the following
A black non-metallic component of the mixture gunpowder.
Name the following:
A physical method of separating iron from an iron-sulfur mixture.
Four atoms of hydrogen combine with one atom of carbon to give methane [CH4]. State the valency of carbon.
Among the following______ is a mixture.
Air is a ______.
