From the given following sol, how many can coagulate silica acid sol?
$F e (O H)_{3}, C a (O H)_{2}, A l (O H)_{3}, S t a r c h, C l a y, A s_{2} S_{3}, C d S, B a s i c d y e$

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Solution

The correct option is B 4
Silica acid sol is negatively charged sol. It can be coagulated by following four positively charged sols. $F e (O H)_{3}, C a (O H)_{2}, A l (O H)_{3},$ and basic dye.

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