Question
Milk is a colloid.

Answer

1. In milk, the particles are spread uniformly throughout and due to very small size of the particles, milk appears to be homogeneous.
2. But milk is a colloid solution and it is a heterogeneous mixture. Here, milk is liquid particles of proteins and fats having a diameter around $10^{-5} m$ dispersed in the aqueous medium. Hence, a milk is a colloid.

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