Assertion :Aqueous gold colloidal solution is red in colour. Reason: Colour to the colloidal solution arises due to scattering of light by its colloidal 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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Both Assertion and Reason are 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
Colloidal gold is a sol or colloidal solution of sub-micrometer-sizednanoparticles in a fluid, usually water. The liquid is usually either an intense red colour (for particles less than 100 nm) or blue/purple (for larger particles). The colour arises due to the scattering of light by colloidal gold particles.
Hence option $A$ is correct.

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