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B
Rain water
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C
Tap water
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D
Mustard oil
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Solution
The correct option is B
Explanation of the correct option:
Raisins swell when it is put in water, because of greater concentration of salt inside the resins and the amount of water is less.
When the raisins put in rainwater, the water from the surrounding diffuses into the raisins so the raisins swell up. The phenomenon involved here is endosmosis.
Finally, it ends in endosmosis, and this is the reason why it swells.
Explanation of the incorrect option:
Other options B,C and D will show the case of hypertonic solution where in the concentration of salt is more and thereby performing exosmosis.
Final answer: Raisins swell when put in Rainwater.