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Answer:
Because B is colloidal solution and A is true solution.
Explanation:
A colloid is a kind of solution in which the size of solute particles is intermediate between those in true solutions and those in suspensions.
In a true solution, the solute particles are so small that they cannot scatter or reflect light rays falling on them.
In a colloidal solution (or colloid), the particles are big enough to scatter light.
If a beam of light is put on a colloidal solution kept in a beaker in a dark room, the path of light beam is illuminated and becomes visible when seen from the side.
The path of light beam becomes visible because colloidal particles are big enough to scatter light falling on them in all directions.
The scattering of light by colloidal particles is known as Tyndall effect.
Tyndall effect can also be observed when a fine beam of light enters a room through a small hole. This happens due to the scattering of light by the particles of dust and smoke in the air.