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Q.

Assertion-Aqueous gold colloidal solution is red in color.

Reason: The color arises due to scattering of light.

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a

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

b

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

c

Assertion is correct but Reason is incorrect

d

Assertion is incorrect but Reason is correct

answer is A.

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Detailed Solution

Concept- The colloidal solution of aqueous gold is red in color. The red color is due to the scattering of light, which is because of the Tyndall effect.
Solution color depends on the size of gold particles. The finest gold particles have red color, as the size increases the color changes from purple to blue and then finally to yellow.
Hence, the correct option is 1

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Assertion-Aqueous gold colloidal solution is red in color.Reason: The color arises due to scattering of light.