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Ethanol is an organic compound, yet it is freely miscible with water. Why?


Answer:

Ethanol is a polar oragnic compound thus it form hydrogen bond with water.
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Mention two biological phenomena regulated by osmosis in plants and animals.

Answer:

(i) Plants absorb water from the soil through their roots due to osmosis.
(ii) In animals, water moves into different parts of body due to osmosis.

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In cold countries, ethylene glycol is added to water radiators of cars during winter. Why?

Answer:

This causes lowering in freezing point of water and therefore water does not freeze in radiators.
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10 mL of a liquid A was mixed with 10 mL of liquid B. The volume of resulting solution was found to be 19.9 mL. What do you conclude?

Answer:

It shows that solution is non ideal showing – ve deviation in which force of attraction increases, volume decreases.
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What happens if pressure greater than osmotic pressure is applied on the solution separated by a semi-permeable membrane from the solvent?

Answer:

On applying  greater pressure than osmotic pressure the reverse phenomenon takes place. 
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