Which among the following ionic species has least precipitating power?

Which among the following ionic species has least precipitating power?
  1. $\mathrm{Cl}^{-}$
  2. $\mathrm{SO}_{4}^{-2}$
  3. $\mathrm{Mg}^{+2}$
  4. $\mathrm{Al}^{+3}$

Solution

Lower the valency of the flocculating ion added, lower is its power to cause precipitation.

Asked in: MHT CET 2020 (15 Oct Shift 2)

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