Advertisements
Advertisements
प्रश्न
How will you separate iron pins from sand ?
Advertisements
उत्तर
We will use magnet to separate iron pins from sand. The property of iron to get attracted towards a magnet is used to separate it from sand.
A magnet is moved on the surface of the mixture. Iron pins are attracted by the magnet. They cling to the poles of the magnet and get separated. This process is repeated till all the iron pins are separated.
APPEARS IN
संबंधित प्रश्न
Intermolecular force of attraction is maximum in ............ less in .......... and the least in .............
Name the terms for the particles of matter which may or may not have independent existence.
Give one difference between atoms and molecules.
When a crystal of potassium permanganate is placed in a beaker, its purple colour spreads throughout the water. What does this observation tell us about the nature of potassium permanganate and water?
What is Brownian motion? Draw a diagram to show the movement of a particle (like a pollen grain during Brownian motion.
Explain why, osmosis can be considered to be a special kind of diffusion. Classify the following into
(i) osmosis, and (ii) diffusion :
- swelling up of a raisin on keeping in water
- spreading of virus on sneezing
- earthworm dying on coming in contact with common salt
- shrinking of grapes kept in thick sugar syrup
- preserving of pickles in salt
- spreading of smell of cake being baked in the kitchen
- aquatic animals using oxygen dissolved in water during respiration
What is meant by saying that metals are lustrous ?
Classify the following into elements and compounds :
- H2O
- He
- Cl2
- CO
- Co
What elements do the following compounds contain ?
Sugar, Common salt
What are the three general classes of matter ? Give one example of each type.
What happens when the temperature of a saturated sugar solution is increased ?
Define solute.
Define Foam Give one example.
What is the difference between colloids and suspensions ?
Fill in the following blanks with suitable words :
Miscible liquids are separated by .....................
Fill in the following blanks with suitable words :
Immiscible liquids are separated by using a .....................
Fill in the following blanks with suitable words :
A heterogeneous mixture of liquid and solid is conveniently separated by...............
How would you obtain sodium chloride from a mixture of sodium chloride and sulphur without using water ?
A standard sheet of paper is about ______ of atoms thick
Seema visited a Natural Gas Compressing Unit and found that the gas can be liquefied under specific conditions of temperature and pressure. While sharing her experience with friends she got confused. Help her to identify the correct set of conditions
