RAS Pre Exam solved Paper 1995
1- An unknown gas dissolve readily in water. The solution turn red litmus blue. The gas react with dydrogen chloride to produce white fumes. The unknown gas is: A. Sulphide Dioxide B. Nitric Oxide C. Ammonia D. Carbon Monoxide Ans: C 2. In developing a Photographic Plate: A. Sodium thiosulphate is used as reducing agent B. … Read more RAS Pre Exam solved Paper 1995