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Among the electrolytes Na2SO4, CaCI2, AI...

Among the electrolytes `Na_2SO_4, CaCI_2, AI_2(SO_4)_3` and `NH_4CI` the most effective coagulating agent for `Sb_2S_3` sol is:

A

`Na_(2)SO_(4)`

B

`CaCl_(2)`

C

`Al_(2)(SO_4)_3`

D

`NH_4Cl`

Text Solution

Verified by Experts

The correct Answer is:
C
The colloidal particles are coagulated with the addition of electrolytes due to the neutralization of charges. According to Hardy-Schulze rule, larger the charge on the ion, larger its coagulation ability. `Sb_2S_3`, being a negative sol, it will be coagulated most effectively by `Al_2(SO_4)_3` as `Al^(3+)`-ion carries the larger positive charge.
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