Advertisements
Advertisements
प्रश्न
Fill in the following blanks with suitable words :
The separation of liquids by fractional distillation is based on the difference in their .....................
Advertisements
उत्तर
The separation of liquids by fractional distillation is based on the difference in their boiling points.
APPEARS IN
संबंधित प्रश्न
The smallest unit of matter that exists freely in nature is called ...........
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 |
Name the terms for the change of a solid into liquid.
The best evidence for the existence and movement of particles in liquids was provided by :
Which of the following substances are elements ?
Water, Salt, Mercury, Iron, Marble, Diamond, Wood, Nitrogen, Air, Graphite, Hydrogen, Oxygen, Sugar, Chlorine
What are the three groups into which all the elements can be divided ? Name two elements belonging to each group.
State one property in which a solution of sugar in water resembles a mixture of sugar and sand, and one property in which it differs from it.
Out of a colloid, solution and a suspension :
which one has the smallest particles ?
What is the difference between solutions and colloids ?
Which of the following will show Tyndall effect ? Why ?
- Salt solution
- Starch solution
- Milk
- Copper sulphate solution
Define Aerosol Give one example.
What is a colloid ? Give two examples of colloids (or colloidal solutions)
One of the following represents the solution of solid in a solid. This one is :
Name the process by which the various gases of the air are separated.
Name the process you would use to separate a mixture of water and alcohol.
Name the process by which common salt is purified.
Which method is better for recovering sugar from sugar solution : evaporation or crystallisation ? Give reason
for your answer.
Name one pair of liquids which can be separated by using a separating funnel.
Solids possess very high kinetic energy.
Define the term matter.
