Indicator solution in Horrocks apparatus contains: (A) Oho toludine, (B) Starch iodide, (C) Ohotoludine arsenite, (D) Bromocresol purple
Answer is B. Horrock&;s apparatus is designed to find out the dose of bleaching powder required for disinfection of water.Starch-iodide indicator solution is used.Park 23e pg: 728