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प्रश्न
A solid mixture contains four constituents P, Q, R and S. P consists of tiny grains and it is mixed with
cement for plastering the walls. Q is a white solid which is recovered on a large scale from sea water by the
process of evaporation. R is in the form of tiny particles of a material whose corrosion is called rusting. And
S is a white solid which is used in making ordinary dry cells.
- What could P, Q, R and S be ?
- How would you separate a mixture containing P, Q, R and S ?
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उत्तर
- P consists of tiny grains and it is mixed with cement for plastering the walls. So, P is sand. Q is a white solid, which is recovered on a large scale from sea water by the process of evaporation. It is common salt. R is in the form of tiny particles of materials, whose corrosion is called rusting. It is, iron filings. S is ammonium chloride.
- At first, let us take the mixture of P, Q, R, and S.
- We first separate R (iron filings) by using a magnet to attract them. Then separate S (ammonium chloride) by sublimation.
- Now, we shake P (sand) and Q (common salt) with water. The mixture is then filtered.
- Sand is obtained as residue.
- Now, we will evaporate the filtrate to dryness to obtain Q (common salt).
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संबंधित प्रश्न
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 |
Fill in the blank
Any matter which has a definite _______ but no definite shape is called a _______
Write true or false for each statement. Rewrite the false statement correctly.
Matter cannot exist in different states.
In a beam of sunlight entering a room, we can sometimes see dust particles moving in a haphazard way in the air. Why do these dust particles move?
During respiration, glucose and oxygen enter our body cells and waste products carbon dioxide and water leave the body cells by the process of :
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of their constituents ?
Name two solid, two liquid and two gaseous elements at the room temperature.
Name a non-metal :
- which is lustrous
- which is required for combustion
- whose one of the allotrophic forms is a good conductor of electricity. Name the allotrope.
- other than carbon which shows allotropy
- which is known to form the largest number of compounds
What are the three general classes of matter ? Give one example of each type.
On the basis of composition of matter, milk is considered to be :
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Choose the correct answer.
A 15% alcohol solution means :
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Ink, Salt solution, Starch solution, Blood, Sugar solution
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______ is so hard that it can scratch glass.
Define the term matter.
Define the term matter.
