Advertisements
Advertisements
प्रश्न
Name the source from which nitrogen and oxygen are obtained on a large scale.
Advertisements
उत्तर
Air is the major source of nitrogen and oxygen.
APPEARS IN
संबंधित प्रश्न
Give one difference between atoms and molecules.
All kinds of matter
A kind of matter which can sublime is
Which of the following materials fall in the category of a “pure substance”?
- Ice
- Milk
- Iron
- Hydrochloric Acid
- Calcium oxide
- Mercury
- Brick
- Wood
- Air
Describe in your own words, what happens to the particles when salt dissolves in water.
The best evidence for the existence and movement of particles in liquids was provided by :
Name a metal which is soft and a non-metal which is hard.
What is the other name for impure substances ? Give two examples of impure substances.
Define Sol and give one example.
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.
Fill in the following blanks with suitable words :
A mixture of kerosene and petrol can be separated by .....................
How is scrap iron separated from a heap of waste materials in factories?
How will you separate a mixture of common salt, sulphur powder and sand ?
How will you separate a mixture of iron filings, chalk powder and common salt ?
The best way to recover sugar from an aqueous sugar solution is :
______ is a smallest particle.
Non-metals are usually poor conductors of heat and electricity. They are non-lustrous, non-sonorous, non-malleable and are coloured.
Name a non-metal which exists as a liquid at room temperature.
Boiling refers to the process by which a substance changes from the liquid to the gaseous state at its ______ point.
