Question

Evaporation is a useful method to obtain a colored component (dye) from blue/black ink. Ink is a…………….
A. Colloidal solution
B. Suspension
C. True solution
D. Precipitate

Answer 1

Hint: To get to the answer of this question you should first recall the basic difference in all processes provided in the options. Then only you can figure out what could be a proper explanation for this colored component.

Complete step by step answer:

Evaporation is a useful method to obtain colored components (dye) from blue/black ink. Here Ink is a colloidal solution. It is a heterogeneous mixture of dye and water. When this mixture is heated, water evaporates and dye is left out.
Here we can also learn how to perfectly separate out the dye -
Prepare a water bath: take a beaker and fill it half with water.
Put about 5 ml of ink in a china dish and then place the china dish over the mouth of the beaker containing water.
Then keep the beaker along with a china dish on a tripod stand and start heating the beaker with a burner.
Soon, the water in the beaker starts boiling to form steam. This steam heats the ink in the china dish. Due to this heating, the water present in ink starts evaporating gradually.
When all the water has evaporated from ink, we stop heating.
We find that a small amount of a solid-colored substance, dye is left behind in the china dish and water is evaporated from the ink.

Therefore, we can conclude that the correct answer to this question is option A.

Note: You should also know that colored components can be separated by the method of chromatography ( paper chromatography ) which works on the principle that those colored components which are more soluble in water rises and in this way, colors of different dyes present in blue-black ink gets separated.