Question

13. When sulphuric acid is added to hypo, the solution ---------- and is able to ----------
a. turns into colloidal solution, scatters the light of longer wavelength only
b. black and absorbs all the light
c. remains unchanged but can observe blue light.
d. turns into colloidal and scatters light of shorter wavelength


Assertion reason questions
(a) Both A and R are true and R is the correct explanation of the assertion.
(b) Both A and R are true but R is not the correct explanation of the assertion.
(c) A is true but R is false.
(d) A is false but R is true.

1. A - Dispersion of light is the splitting of light when passes through a prism.
R – When light passes through a prism it gets internally reflected and a band of 7 colors appears.

Answer 1

13) d)

1) c)

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Answer 2

13. When sulphuric acid is added to hypo, the solution turns into colloidal and is able to scatter light of shorter wavelength.

• A colloidal solution has a property of scattering a beam of light.
• The particles of the medium scatter the light.
• This effect is called Tyndall Effect.
• For tyndall effect to take place, the diameter of particles should be smaller than the wavelength of light being scattered.

A is true but R is false because:

• Dispersion of light is the phenomenon of splitting of white light into its 7 constituent colours.
• The colours are seen in the VIBGYOR pattern.
• Splitting of white light occurs when passed via prism because the two sides are not parallel to each other and thus each component of light is bent to a different extent.