Question

Which of the following ion will have minimum flocculation value for ferric oxide sol?

• A. $F^{-}$
• B. $O_2^{-}$
• C. $P{O}_4^{3-}$
• D. $C{l}^{-}$

Answer 1

The correct option is C

$P{O}_4^{3-}$

Ions having a bigger charge are required in a lesser amount to cause flocculation. The charge on $P{O}_4^{3-}$ is maximum among the options.