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The absorption of ink by blotting paper involves

1. viscosity of ink
2. capillary action phenomenon
3. diffusion of ink through the blotting
4. siphon action

Correct answer: capillary action phenomenon

Solution

Blotting paper contains very fine pores that act like capillaries. These capillaries draw the ink into the paper by capillary action. That is why ink spreads quickly into blotting paper.

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