Advertisements
Advertisements
Question
How will you separate iron pins from sand ?
Advertisements
Solution
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
RELATED QUESTIONS
What do you mean by the inter-molecular spaces? How do they vary in different states of matter?
Gases have definite volume but no definite shape.
Name the scientist who studied the movement of pollen grains suspended in water through a microscope. What is this phenomenon known as?
When a gas jar containing air is inverted over a gas jar containing bromine vapour, the red-brown bromine vapour diffuse into air. Explain how bromine vapour diffuse into air.
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 ?
State whether the following statement is true or false :
Bread is an example of solid foam.
Define solvent.
Classify the following into true solutions and colloidal solutions:
Ink, Salt solution, Starch solution, Blood, Sugar solution
Define solubility of a substance. How does it vary with temperature ?
What is the difference between colloids and suspensions ?
What is the general name of the process by which tea-leaves are separated from prepared tea ?
Write a method to separate a mixture of sand and potash alum.
Explain how, impure copper sulphate can be purified by crystallisation.
______ is not made of matter.
A standard sheet of paper is about ______ of atoms thick
What type of matter glass is?
Liquids cannot be compressed and they have fixed volume.
Celsius scale is a scale of temperature in which zero represents the melting point of ice and 100 represents the boiling point of water.
Define the term matter.
