Advertisements
Advertisements
प्रश्न
Describe the various steps involved in the separation of iodine, iron filings and salt from a mixture.
Advertisements
उत्तर
Following steps are involved in separation of iron filings, chalk powder and common salt:
- At first, a magnet is moved on a mixture of iodine, iron fillings and salt. Due to the magnetic property of iron, iron fillings are separated by the magnet.
- As all the iron is removed, the mixture now contains iodine and salt. Iodine sublimes on heating but salt does not. So, on heating the mixture, we obtain the vapours of iodine.
- Vapours of iodine are condensed in a cold apparatus. Salt remains behind as residue. Therefore, the components of mixture get separated.
APPEARS IN
संबंधित प्रश्न
Define the term matter. What is it composed of?
Fill in the blank :
The state of matter with definite volume and definite shape is called______
Name the terms for the particles of matter which may or may not have independent existence.
Give one difference between atoms and molecules.
What is Brownian motion? Draw a diagram to show the movement of a particle (like a pollen grain during Brownian motion.
There is a large group of materials P which can be divided into three groups Q, R and S on the basis of their properties. The substances belonging to group Q can be solids, liquids or gases. The solids belonging to group Q are usually electrical insulators. Most of the substances of group R are solids which are good conductors of electricity. The substances belonging to group S are neither insulators like Q nor good conductors like R. The properties of S are intermediate between those of Q and R.
- What could the group of materials P be ?
- Name the substances Q. Give two examples of such substances.
- Name the substances R. Write two examples of such substances.
- Name the substances S. Give two examples of such substances.
- Out of Q, R and S, which substances are malleable and ductile ?
State whether colloidal solutions are homogeneous or heterogeneous.
Name the different types of solutions. Give one example of each.
What difference in the property of two miscible liquids enables their separation by fractional distillation ?
State whether the following statement are true or false :
Alcohol can be separated from a mixture of alcohol and water by a separating funnel.
What is chromatography ? State its two applications.
The material which is added to water during purification process at the water works so as to disinfect it is :
You are given a mixture of iodine in alcohol called tincture iodine. Which method will you use to recover both, iodine as well as alcohol, from this mixture ?
There are three liquids A, B and C, all having different densities and different boiling points. Liquids A and C are organic in nature whereas liquid B is considered to be inorganic. When liquids A and B are put together in a container, they form a single layer. On the other hand, when, liquids B and C are mixed, they form two separate layers :
(a) Which process will you use to separate a mixture of A and B ?
(b) Which method will you use to separate a mixture of B and C ?
(c) Name the liquids which would behave like (i) A (ii) B and (iii) C.
Write a few lines on the blackboard with a chalk. Now observe the chalk. What changes do you see in the chalk?
Asmita went to buy an earthen pot. There she saw many things kept for sale.
How did she identify what she needed?
The particles in the matter are extremely small and can be seen even with a powerful microscope.
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.
Gases change to liquid by the process of ______.
Evaporation does form bubbles.
