Advertisements
Advertisements
प्रश्न
You have been given a suspension and a solution. How could you tell the difference between them by their appearance ?
Advertisements
उत्तर
Both the given solutions will be kept stationary in different beakers for some time. The beaker in which the dissolved particles settle down after some time is a suspension and another one is a solution.
APPEARS IN
संबंधित प्रश्न
The inter-molecular force is maximum in
The inter-molecular space is maximum in
Name two processes which provide the best evidence for the motion of particles in matter.
Name a non-metal which is a good conductor of electricity.
Name a metal which is yellow in colour.
Which of the following will show Tyndall effect ? Why ?
- Salt solution
- Starch solution
- Milk
- Copper sulphate solution
When the solid A is added to water, it dissolves with the evolution of a lot of heat and making little explosions to form two products B and C. The properties of products B and C are entirely different from those of solid A as well as water. Moreover, products B and C cannot be reconverted into solid A and water. When another solid D is added to water, it dissolves with the absorption of a little heat to form a product E which cools down. The product E shows the properties of both, solid D as well as water. Moreover, product E can be converted into solid D and water.
(a) What type of change occurs when solid A is dissolved in water ? Why ?
(b) What type of change occurs when solid D is dissolved in water ? Why ?
(c) Name a metal which you think could behave like solid A. Also name the products B and C.
(d) Name the solid D if it is the one which is used in making ordinary dry cells.
(e) Name the process by which D can be recovered from E.
How will you separate a mixture of iron filings and powdered carbon ?
The technique which is used to separate particles of a solid suspended in a liquid quickly is called :
Which of the following cannot be separated from air by the process of fractional distillation ?
Tincture of iodine is a mixture of two materials X and Y. The material Y has a property that its solid form can be converted directly into vapours on heating by a process called Z.
- What could X be ?
- What could Y be ?
- Name the process Z.
- Which process would you use to recover both the components X and Y from tincture of iodine ?
- Which process can be used to recover only component Y from tincture of iodine ?
What's the solution?
We need to rub salt on a corncob, but only salt crystals are available.
Asmita went to buy an earthen pot. There she saw many things kept for sale.
How did she identify what she needed?
Asmita went to buy an earthen pot. There she saw many things kept for sale.
From what substance has the potter made all the things?
Why wires cannot be drawn from materials such as stone or wood?
Match the physical quantities given in column A to their S I units given in column B:
| (A) | (B) | ||
| (a) | Pressure | (i) | cubic metre |
| (b) | Temperature | (ii) | kilogram |
| (c) | Density | (iii) | pascal |
| (d) | Mass | (iv) | kelvin |
| (e) | Volume | (v) | kilogram per cubic metre |
In Aerosol the dispersed phase is liquid and the dispersion medium is gas.
Liquids cannot be compressed and they have fixed volume.
The fluidity of solids: ______.
Examples of foam are ______.
