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As the size of gold particle increases the colour of solution varies as

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Purple $\to$ blue $\to$ golden $\to$ red

Golden $\to$ red $\to$ purple $\to$ blue

Red $\to$ purple $\to$ blue $\to$ golden

Blue $\to$ purple $\to$ golden $\to$ red

answer is C.

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Detailed Solution

The colour of the solution changes from red to purple to blue to golden as the size of the gold particles rises.

As a result, the size of the gold particles affects the colour of the solution.

Therefore, As the size of gold particle increases the colour of solution varies as Red $\to$ purple $\to$ blue $\to$ golden.

Hence the correct option is (C).

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