Advertisements
Advertisements
प्रश्न
Explain why, osmosis can be considered to be a special kind of diffusion. Classify the following into
(i) osmosis, and (ii) diffusion :
- swelling up of a raisin on keeping in water
- spreading of virus on sneezing
- earthworm dying on coming in contact with common salt
- shrinking of grapes kept in thick sugar syrup
- preserving of pickles in salt
- spreading of smell of cake being baked in the kitchen
- aquatic animals using oxygen dissolved in water during respiration
Advertisements
उत्तर
Osmosis is considered to be a special kind of diffusion because it takes place only through a semi-permeable membrane, which allows only solvent particles to pass through it.
- Osmosis: a, c, d and e
- Diffusion: b, f and g.
संबंधित प्रश्न
The smallest unit of matter that exists freely in nature is called ...........
Intermolecular force of attraction is maximum in ............ less in .......... and the least in .............
During respiration, glucose and oxygen enter our body cells and waste products carbon dioxide and water leave the body cells by the process of :
Classify the following as elements or compounds :
Iron, Iron sulphide, Sulphur, Chalk, Washing soda, Sodium, Carbon, Urea
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
Which of the following statements are true for pure substances ?
- pure substances contain only one kind of particles
- pure substances may be compounds or mixtures
- pure substances have the same composition throughout
- pure substances can be exemplified by all elements other than nickel
State whether colloidal solutions are homogeneous or heterogeneous.
Choose one term from the following which includes the other three :
aerosol, emulsion, colloid, sol
Define solute.
Define Aerosol Give one example.
What will happen if a saturated solution is :
- heated
- cooled
Which of the following are chemical changes and which physical ? Give reason.
- a glass bottle breaking
- coal burning in air
- making a cake
- wool being knitted into a sweater
Which technique can be used to detect and identify traces of poison present in the stomach wash of a person ?
How will you separate a mixture of iron filings and powdered carbon ?
Describe the method of separating a mixture containing common salt, sand and ammonium chloride.
Describe a method for separating a mixture of iron filings and sulphur powder other than that by using a magnet.
Differentiate between the-two characteristics of matter – ‘mass’ & ‘weight’.
Justify your answer.
| Figure 1 | Figure 2 | Figure 3 |
 |
 |
 |
The arrangement of particles in three different phases of matter is shown above.
- Which state is represented by Fig. 1?
- In which state will the inter-particle attraction be maximum?
- Which one of them cannot be contained in an open vessel?
- Which one can take the shape of its container?
State whether true or false. If false, correct the statement.
Oil and water are immiscible with each other.
Stars including Sun are covered in ______.
