When we put some crystals of potassium permanganate in a beaker containing water, we observe that after some time whole water was turned pink. This is due to

Options

A. boiling
B. melting of potassium permanganate crystals
C. sublimation of crystals
D. diffusion

Explanation

**Step-by-Step Solution:**

1. **Understanding the Setup**: We start with a beaker containing water. When we add potassium permanganate (KMnO4) crystals to this water, we need to observe what happens over time.

2. **Initial Observation**: Initially, the potassium permanganate crystals are concentrated at the bottom of the beaker. The water remains clear at this point.

3. **Diffusion Process**: As time passes, the KMnO4 crystals begin to dissolve. The potassium permanganate particles are small and can move through the water.

4. **Intermolecular Spaces**: Water is made up of molecules that have intermolecular spaces between them. These spaces allow the dissolved particles of potassium permanganate to move.

5. **Movement of Particles**: The particles of potassium permanganate diffuse into the water. This means they spread out from an area of high concentration (where the crystals were) to areas of lower concentration (the surrounding water).

6. **Color Change**: As the KMnO4 particles diffuse throughout the water, they impart a pink color to the entire volume of water. This is due to the presence of potassium permanganate, which is a colored compound.

7. **Conclusion**: The entire process of the potassium permanganate particles spreading throughout the water, resulting in a uniform pink color, is called diffusion.

**Final Answer**: The water turns pink due to the diffusion of potassium permanganate crystals in the water.

---