A) \[N{{a}_{2}}HP{{O}_{3}}\]
B) \[NaN{{O}_{3}}\]
C) \[N{{a}_{3}}P{{O}_{4}}\]
D) \[N{{a}_{2}}S{{O}_{4}}\]
Correct Answer: C
Solution :
\[\text{Fe(OH}{{\text{)}}_{\text{3}}}\]is a positive sol hence the best coagulant for the precipitation of \[\text{Fe(OH}{{\text{)}}_{\text{3}}}\]is \[\text{N}{{\text{a}}_{\text{3}}}\text{P}{{\text{O}}_{\text{4}}}\text{.}\]The precipitating effect of an ion on dispersed phase of opposite charge increases with the valence of the ions.
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