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
Which of the following materials fall in the category of a “pure substance”?
- Ice
- Milk
- Iron
- Hydrochloric Acid
- Calcium oxide
- Mercury
- Brick
- Wood
- Air
What are the conditions for 'something' to be called 'matter'?
Describe in your own words, what happens to the particles when salt dissolves in water.
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.
Fill in the following blanks with suitable words :
Brass is an alloy which is considered a ..............
Which of the following are ‘pure substances’ ?
Ice, Milk, Iron, Hydrochloric acid, Calcium oxide, Mercury, Brick, Wood, Air
Define Aerosol Give one example.
Differentiate between a saturated and an unsaturated solution. How will you test whether a given solution is saturated or not ?
Which of the following represents the solubility of sugar in water at 20°C ?
What difference in the properties of oil and water enable their separation by a separating funnel ?
How is scrap iron separated from a heap of waste materials in factories?
How will you separate iron pins from sand ?
How will you separate a mixture of iron filings, chalk powder and common salt ?
With the help of a labelled diagram, describe the method of separating ammonium chloride from a mixture of ammonium chloride and common salt. Mention the difference in the properties of ammonium chloride and sodium chloride which has made this separation possible.
Explain how, nitrogen , oxygen and argon gases are separated from air.
The material which is added to water during purification process at the water works so as to disinfect it is :
Name the metals that are used in jewellery.
Write scientific reason.
Lemon sherbat has sweet, sour and salty taste and it can be poured in a glass.
Define the term matter.
Define the term matter.
