Which among the following is a negatively charged sol?

Which among the following is a negatively charged sol?
  1. CdS
  2. $\mathrm{CrO}_3 \cdot \mathrm{xH}_2 \mathrm{O}$
  3. $\mathrm{Al}_2 \mathrm{O}_3 \cdot \mathrm{xH}_2 \mathrm{O}$
  4. $\mathrm{TiO}_2$

Solution

Theory based

Asked in: MHT CET 2022 (07 Aug Shift 2)

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