Advertisements
Advertisements
Question
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
Solution
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.
RELATED QUESTIONS
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 :
The substances which can flow are called ________
What are the conditions for 'something' to be called 'matter'?
Name the property which enables metals to be drawn into wires.
The three important metalloids are.............................. and ..........................
What elements do the following compounds contain ?
Sugar, Common salt
Draw a flow-chart for the schematic representation of different types of matter.
One of the following substances is neither a good conductor of electricity nor an insulator. This substance is :
21.5 g of sodium chloride dissolves in 60 g of water at 25°C. Calculate the solubility of sodium chloride in water at that temperature.
9.72 g of potassium chloride dissolves in 30 g of water at 70°C. Calculate the solubility of potassium chloride at that temperature.
What is meant by a solution?
What is a colloid ? Give two examples of colloids (or colloidal solutions)
Name the process which can be used to recover salt from an aqueous salt solution.
Name the process which can be used to purify an impure sample of copper sulphate.
Fill in the following blanks with suitable words :
The separation of liquids by fractional distillation is based on the difference in their .....................
Describe a method to separate a mixture of common salt and sand.
How can you obtain pure water from a salt-water mixture (or salt-solution) ? Draw a neat and labelled diagram of the apparatus you would use to obtain pure water from a salt-water mixture (or salt-solution).
Name one pair of liquids which can be separated by using a separating funnel.
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?
Which of the following are homogeneous in nature?
(i) ice
(ii) wood
(iii) soil
(iv) air
