Question

Why dry raisins placed in water swell up ?
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Answer 1

because they absorb water and hence swell up

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Answer 2

a) Raisins are dried grapes. When they are placed in water, the water from the surrounding diffuses into the raisins and so the raisins swell up. The phenomenon involved is called osmosis.

b) When swollen raisins are placed in concentrated sugar solution, they will shrink.

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