Under the influemce of an electric field, the particles in a sol migrate towards cathode. The coagulation of the same sol is studied using `NaCl,Na_(2)SO_(4)` , and `Na_(3)PO_(4)` solutions. Their coagulation values will in the order
a. `NaClgtNa_(2)SO_(4)gtNa_(3)PO_(4)`
b. `Na_(2)SO_(4)gtNa_(3)PO_(4)gtNaCl`
c. `Na_(3)PO_(4)gtNa_(2)SO_(4)gtNaCl`
d. `Na_(2)SO_(4)gtNaClgtNa_(3)PO_(4)`
A. NaCl
B. `Na_(2) So_(4)`
C. `Na_(3) PO_(3)`
D. same for all
