Direction for: In each of the following questions a statement of Assertion is given followed by a corresponding statement of Reason just below it. Of the statements mark the correct answer as
Assertion: Aqueous gold colloidal solution is red in colour. Reason: The colour arises due to scattering of light by colloidal gold particles.A) If both assertion and reason are true and reason is not the correct explanation of assertion.
B) If both assertion and reason are true but reason is not the correct explanation of assertion.
C) If assertion is true but reason is false.
D) If both assertion and reason are false.
Correct Answer: A
Solution :
The colour of colloidal solution depends upon the wavelength of light scattered by the dispersed particles which in turn depends on size and nature of particles. Finest gold colloidal solution is red, as the size increase it becomes purple, blue and finally yellow.
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