Question

A drop of ink put in water illustrates
(A) Heating of molecules in a substance
(B) Stationary nature of molecules in a substance
(C) Motion of molecules in a substance
(D) Motion of substance in a molecule

Answer 1

Basically we have seen this experiment, take one transparent glass that is filled with water, and add one drop of ink to it and just notice it. The ink particle moves the whole quantity of water molecules and mixes to make the colour bluish of the entire water.

Complete step by step solution:
When a drop of ink is added into the water gradually it moves in the whole quantity of water due to this entire water turning into blue colour. This is nothing but the diffusion of ink particles into the water molecules. This is for the reason that water, as well as ink molecules, are in random motion due to the motion of ink substance. We can say blue coloured particles of the ink fused all over and give blue colour to the water.
Based on the above explanation, we chose option (D) as a correct answer. In the (D) option mentioned the motion of substance in a molecule. Thus we can understand the motion of ink substances in water molecules.

Additional information:
If we compare the ink particles to the honey, then ink particles will spread faster as compared to honey because the density of honey is more than that of ink. For that reason, ink particles diffuse faster as compared to honey particles.

Note:
In this experiment, the diffusion process takes place between the particles of ink and water. Due to the motion of molecules of ink in water, means ink moves around the water and gently mixes with water. This query may request in a different way instead of ink they gave honey or oil then we have to analyze consequently.