Assertion :Aqueous gold colloidal solution is red in colour. Reason: The colour arises due to scattering of light by colloidal gold particles.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Aqueous gold colloidal solution is red in colour. The colour is due to scattering. It depends upon the size of particles. Finest gold sol has red colour. As the size of the particle increases, it becomes purple and then blue and finally golden yellow.

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