The coagulation values in millimoles per litre of the
electrolytes used for the coagulation of ``As_2S_3`` are
given below :
I. (NaCl) = 52, II. (``BaCl_2``) = 0.69,
III. (``MgSO_4``) = 0.22
The correct order of their coagulating power is
(1) III > II > I
(2) III > I > II
(3) I > II > III
(4) II > I > III