Which of the following are negative colloids?

F e {(O H)}_{3}

sol

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{A s}_{2} S_{3}

sol

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Blood

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Gold sol

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Solution

The correct options are
A ${A s}_{2} S_{3}$ sol
B Gold sol
C Blood
Based on the nature of charge, the colloidal sols may be classified as positively charged and negatively charged sols.
$F e (O H)_{3}$ - Positive colloid
$A s_{2} S_{3}$ - Negative colloid
Blood - Negative colloid
Gold sol - Negative colloid

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