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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.

Answer»

If both assertion and reason are ture, and reason is the trure explanation of the assertion.
If both assertion and reason are true, but reason is not the true explanation of the assertion.
If assertion is true, but reason is false.
If both assertion and reason false.

SOLUTION :The colur is due to scattering . It depends upon to size of particles. Finest gold sol has red colour. At the size of the particles INCREASES, it BECOMES PURPLE than blue and finally golden YELLOW.


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