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 through out the house.
(g) Aquatic animals using oxygen dissolved in water during respiration.

Explanation

To classify the given processes into osmosis or diffusion, we first need to understand the definitions of both terms:

- **Osmosis**: It is the movement of solvent molecules (usually water) through a semi-permeable membrane from a region of lower solute concentration to a region of higher solute concentration.
- **Diffusion**: It is the movement of molecules from an area of higher concentration to an area of lower concentration, and it does not require a semi-permeable membrane.

Now, let's classify each item:

### Step-by-Step Solution:
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