Question

group of students took an old shoe box and covered it with a black paper from all sides . They fixed a source of light at one end of the box by making a hole in it and made another hole on the other side to view the light . They placed a milk sample contained in a beaker in the box as shown in the figure . They were amazed to see that milk taken in the beaker was illuminated . They tried the same activity by taking a salt solution but found that light simply passed through it. Try to answer questions 6 (i), (ii) , (iii) and (iv) choosing the correct options. Q.6 (i) Name the phenomenon involved in the above experiment *

1 point

Illumination

Tyndall effect

Evaporation

Suspension

Q.6 (ii) In which category will you place milk as *

1 point

True solution

Suspension

Colloidal

None of these

Q.6 (iii) Which one of the following shows the same effect as shown by milk solution ? *

1 point

dust particles and water

ink in water

ammonium chloride and salt

lemon juice and water

 

This is a required question

Q.6 (iv) Why same result was not observed with salt solution ? *

1 point

Because it is a suspension.

Because it is a colloid.

Because it is a true solution.

None of these​

Answer 1

Answer:

Solution

(a) The milk sample was illuminated because milk is a colloidal solution and its particles are big enough to scatter the light, hence they scatter the light passing through it. The phenomenon observed is called "Tyndall effect".

(b) As salt solution is a true solution i.e., solute particle size is too small to scatter the light, hence, it does not show "Tyndall effect".

(c)Examples of colloid are gold sol, arsenius sulphide (As2S3) sol., Blood etc.

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