Advertisements
Advertisements
प्रश्न
Which of the two will scatter light : soap solution or sugar solution ? Why ?
Advertisements
उत्तर
Soap solution is a colloidal solution. Therefore, it scatters light due to large particles and creates Tyndall effect.
APPEARS IN
संबंधित प्रश्न
The inter-molecular force is maximum in
Give one difference between atoms and molecules.
All kinds of matter
An inflated balloon full of air goes down slowly (becomes smaller and smaller slowly) even though the knot at the mouth of the balloon is airtight. And after a week all the air has escaped from the balloon. Explain how the air particles got out of the balloon.
When extremely small particles X derived from the anther of a flower were suspended in a liquid Y and observed through a microscope, it was found that the particles X were moving throughout the liquid Y in a very zig-zag way. It was also observed that warmer the liquid Y, faster the particles X moved on its surface.
- What could particles X be ?
- What do you think liquid Y is ?
- What is the zig-zag movement of X known as ?
- What is causing the zig-zag movement of particles X ?
- Name the scientist who discovered this phenomenon.
- What does this experiment tell us about the nature of liquid Y?
Define a compound. Give two points of evidence to show that sodium chloride is a compound.
Name a metal which has a low melting point.
Which of the following are not compounds ?
Chlorine gas, Potassium chloride, Iron powder, Iron sulphide, Aluminium foil, Iodine vapour, Graphite, Carbon monoxide, Sulphur powder, Diamond
“Is malleable and ductile” best describes :
On the basis of composition of matter, milk is considered to be :
What is the name of the clear liquid formed when a solid dissolves in a liquid ?
Which one of the following is not a chemical change ?
Which method is better for recovering sugar from sugar solution : evaporation or crystallisation ? Give reason
for your answer.
Asmita went to buy an earthen pot. There she saw many things kept for sale.
What is the difference between a substance and an object?
The non S I and S I units of some physical quantities are given in column A and column B respectively. Match the units belonging to the same physical quantity:
| (A) | (B) | ||
| (a) | degree celsius | (i) | kilogram |
| (b) | centimetre | (ii) | pascal |
| (c) | gram per centimetre cube | (iii) | metre |
| (d) | bar | (iv) | kelvin |
| (e) | milligram | (v) | kilogram per metre cube |
Rusting of an article made up of iron is called
Intermolecular space is maximum in ______.
Solid is an arrangement of particles ______.
Define the term matter.
