Question

Ravi took some amount of substance X and added it into a transparent beaker containing water. He mixed the solution very well and then passed light through the solution by using a torch. The path of light was visible. He wanted to show this experiment to his younger brother. He kept the solution for 10 min and calls his brother and repeat the experiment, but results are different at this time. The path is not visible.

What is the nature of solution obtained, when X is added to water?

(a) Colloid
(b) True Solution
(c) Suspension
(d) None of the above

Answer 1

Explanation:

powdered dal, crushed

groundnuts, dilute

iodine solution, copper

sulphate solution,

sodium hydroxide

solution (caustic soda),

piece of white paper, test

tubes and a dropper.

ACTIVITY 6.2.1

How can we identify

the major components

in our food?

Observation

You will see dark blue black colour. This

Answer 2

The nature of the solution obtained, when X is added to water is (c) suspension.

• The colloid is characterized as a mixture where microscopic particles are suspended in another substance. The particles remain suspended and do not settle. It is heterogeneous. The colloidal solution shows the Tyndall effect. Examples of colloids are blood, and gold Sol.
• The true solution is the homogenous mixture. Here both substances are equal in size. Also, the particles are unable to be filtered by the filtration process. An example of a true solution is a sugar solution in water.
• Suspension is a heterogeneous mixture. In the suspension solution, all particles are visible without aid. Here the large particles settle after some time due to gravitational force. An example is the solution of mud and water.
• Thus, solution X is a suspension solution.

#spj2