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प्रश्न
Name the source from which nitrogen and oxygen are obtained on a large scale.
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उत्तर
Air is the major source of nitrogen and oxygen.
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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 |
Select the correct alternative
The molecules can move freely anywhere in
- gases
- liquids
- solids
- none of the above
Which one is a kind of matter:
A kind of matter which can sublime is
Classify the following into elements and compounds :
- H2O
- He
- Cl2
- CO
- Co
What elements do the following compounds contain ?
Sugar, Common salt
The elements which normally exist in the liquid state are :
Choose one term from the following which includes the other three :
aerosol, emulsion, colloid, sol
What is the difference between solutions and colloids ?
Classify the following into true solutions and colloidal solutions:
Ink, Salt solution, Starch solution, Blood, Sugar solution
Which of the following do not exhibit Tyndall effect ?
Starch solution, Sugar solution, Ink, Salt solution, Copper sulphate solution, Ammonium chloride solution, Fog, Smoke, Car exhausts.
A carpenter wants to separate iron nails from saw-dust. Which method of separation should he choose ?
How will you separate a mixture containing sand and sugar ?
Write a method to separate a mixture of sand and potash alum.
How will you separate camphor, common salt and iron nails from their mixture ?
What type of matter glass is?
Which of the following statements are true for pure substances?
(i) Pure substances contain only one kind of particles
(ii) Pure substances may be compounds or mixtures
(iii) Pure substances have the same composition throughout
(iv) Pure substances can be exemplified by all elements other than nickel
______ is so hard that it can scratch glass.
Define the term matter.
Write a scientific reason.
Lemon sherbat has sweet, sour and salty taste and it can be poured in a glass.
