A: A colloidal sol of $Fe (OH)_{3}$ formed by peptization carries positive charge.
R: During formation of $Fe (OH)_{3}$ sol, electrons are lost by the particles

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(A) is true but (R) is false

Both (A) and (R) are true and (R) is the correct explanation of (A)

Both (A) and (R) are true and (R) is not the correct explanation of (A)

Both (A) and (R) are false

answer is C.

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Detailed Solution

$Fe (OH)_{3}$ is peptidized to create a positively charged colloidal sol.

By adding an appropriate electrolyte, a precipitate is transformed into colloidal particles during the peptidization process.

The freshly precipitated ferric hydroxide is mixed with a tiny amount of ferric chloride solution to create a reddish brown tinted colloidal solution.

Since ${Fe}^{3 +}$ ions are shared by the lattice of $Fe (OH)_{3}$ particles, which gives colloidal particles in the solution a positive charge, $Fe (OH)_{3}$ has a tendency to adsorb $F e^{3 +}$ ions in the solution preferentially