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Assertion: Aqueous gold colloidal solution is red in colour.

Reason: The colour arises due to scattering of light by colloidal gold particles.

(a) Both A and R are true and R is the correct explanation of A

(b) Both A and R are true but R is not correct explanation of A

(c) A is true but R is false

(d) A and R are false

1 Answer

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Best answer

Correct option (a) Both A and R are true and R is the correct explanation of A

Explanation:

The colour of colloidal solution depends on the wavelength of light scattered by the dispersed particles. The wavelength of light further depends on the size and nature of the particles. Finest gold sol is red in colour. As size of the particles increases, it becomes purple, then blue and finally golden yellow.

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