Tender For corrigendum : supply of hydrochloric acid as per is 265 (q3) , silver nitrate as per is 2214 (q3) , sodium chloride, analytical reagent as per is: 4408 (q3) , silica gel as per is 3401 (q3) , ammoniumferroussulphate hexahydrate (q3) , sulfuric acid (research grade) (q3)