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JEE Main202126 Feb 2021Evening ShiftChemistrySurface ChemistryActual

The nature of charge on resulting colloidal particles when FeCl 3 is added to excess of hot water is:

Options

  1. Apositive
  2. Bsometimes positive and sometimes negative
  3. Cneutral
  4. Dnegative

Correct answer

A. positive

Step-by-step solution

If FeCl 3 is added to hot water, a positively charged sol, hydrated ferric oxide is formed due to adsorption of Fe 3 + ions. Fe 2 O 3 · xH 2 O / Fe 3 + Positively charged. Thus, When   FeCl 3 ​ sol is treated with hot water, it forms Fe ( OH ) 3 ​ forming Fe 3 + ions(in excess amount) and these positive ions are adsorbed preferentially.

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