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Q: A drop of food colouring spreading out in a cup of water is an example of:
  • A. osmosis
  • B. vapour pressure
  • C. effusion
  • D. diffusion
Correct Answer: Option D - When two liquids naturally form a new homogenous mixure (solution) when they are mix together that action is called diffusion. For example-when a few drops of ink is put in liquid, the colour of entire water becomes similar to the colour of the ink due to the diffusion of the particle present in the ink. This process continues untill a homogenous mixure of water and ink is formed.
D. When two liquids naturally form a new homogenous mixure (solution) when they are mix together that action is called diffusion. For example-when a few drops of ink is put in liquid, the colour of entire water becomes similar to the colour of the ink due to the diffusion of the particle present in the ink. This process continues untill a homogenous mixure of water and ink is formed.

Explanations:

When two liquids naturally form a new homogenous mixure (solution) when they are mix together that action is called diffusion. For example-when a few drops of ink is put in liquid, the colour of entire water becomes similar to the colour of the ink due to the diffusion of the particle present in the ink. This process continues untill a homogenous mixure of water and ink is formed.