1.

Which of the following will be the most effective in the coagulation of `Fe(OH)_(3)` sol ?A. `Mg(PO_(4))_(2)`B. `BeCl_(2)`C. `NaCl`D. `KCN`

Answer» Correct Answer - A
Accrding to Hardy Schulze rule, coagulation power of lons is directiy proportional to charge on ion.
`:.Fe(OH)_(3)` is positively charged colloid.
`:.` It will be coagulated anion.
(a) `Mg_(3)(PO_(4))_(2)hArr 3Mg^(2+) + 2PO_(4)^(3-)`
(b) `BaCl_(2)hArrBa^(2+) + 2Cl^(-)`
(c ) `NaClhArr Na^(+) + Cl^(-)`
(d)`KCN hArrK^(+) + CN^(-)`


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