Cl - + H 2 SO 4 → HCl + HSO Gas so produced (1) Turns blue litmus paper red (2) Gives white fumes of NH 4 Cl when a glass rod moistened with ammonia solution is brought near the mouth of test tube. ii) Silver nitrate solution: White, curdy ppt. of AgCl insoluble in water & in dil .nitric acid, but soluble in dilute ammonia solution. Inorganic Chemistry> blue litmus paper is brought near the mou... blue litmus paper is brought near the mouth of the delivery tube to check the presence of HCL acid but no change is observed in the color of litmus paper because: Harshit Singh , 4 Years ago Grade 12th pass Acids turn blue litmus red. Bases or alkalis turn red litmus blue. Neutral solutions don’t change the colour of either red litmus paper or blue litmus paper . Get Revision Notes of Class 7th Science Chapter 5 Acids, Bases and Salts to score good marks in your Exams. Our notes of Chapter 5 Acids, Bases and Salts are prepared by Maths experts in an easy to remember format, covering all syllabus of CBSE, KVPY, NTSE, Olympiads, NCERT & other Competitive Exams.
