Classify the following into osmosis/diffusion
(a) Swelling up of a raisin on keeping in water.
(b) Spreading of virus on sneezing.
(c) Earthworm dying on coming in contact with common salt.
(d) Shrinking of grapes kept in thick sugar syrup.
(e) Preserving pickles in salt.
(f) Spreading of smell of cake being baked throughout the house.
(g) Aquatic animals using oxygen dissolved in water during respiration.

AcademicChemistryNCERTClass 9

(i) Osmosis: 

(a) swelling up of a raisin on keeping in water - The concentration of water surrounding the raisin will be more than the water concentration inside the raisin. Hence, there is a movement of water from higher concentration to lower concentration which will make the raisin swell up.

(c) Earthworms dying on coming in contact with common salt - When salt is sprinkled on them, their skin gets dried due to osmosis due to which their body shrinks and they die.

(d) shrinking of grapes kept in thick sugar syrup - Since grapes are placed in a hypertonic solution, the water from the grapes moves out due to exosmosis. This results in the shrinkage of grapes.

(e) preserving of pickles in salt - Salt draws water out of the cells of the microorganisms, thereby, preventing their growth. It also produces lactic acid during anaerobic fermentation and prevents spoilage.

(ii) Diffusion: 

(b) spreading of virus on sneezing - Microscopic virus gets diffused in the air.

(f) spreading of smell of cake being baked in the kitchen - due to the diffusion of molecules from a region of higher concentration to lower concentration.

(g) aquatic animals using oxygen dissolved in water during respiration - Fish absorb oxygen from the water through gills and skin by the process of osmosis.
raja
Updated on 10-Oct-2022 13:29:22

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