Which of the following is a solid-in-solid colloid?

Shaving cream

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Milk of magnesia

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Milky glass

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Cheese

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Solution

The correct option is C Milky glass

The colloidal solutions are divided into different categories based on the physical state of the dispersed phase and the dispersion medium. Solid sol is one of them in which both dispersed phase and dispersion medium are solid. Ex: coloured glass, gems, alloys, ruby stone, etc.
Hence option C is correct.

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