To coagulate gelatin sol, which of the following is most effective :— 
(1) NaCl                 (2) N A 3 P O 4
(3) A l C l 3             (4) Alcohol    


Dear student,
For coagulation of gelatin, one must remove the water layer developed on the sol and for that we need a dehydrating agent. Now Na3PO4 is a good dehydrating agent and hence can best be used to remove water layer which will coagulate the gelatin sol.

Hope it helps

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