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:

Asked in RPSC RAS Prelims 1995 · Topic: Sulphur, Nitrogen, Halogen, Inert Gases (Ammonia: Preparation (Haber process), properties, structure, and industrial applications)

1. Sulphide Dioxide
2. Nitric Oxide
3. Ammonia
4. Carbon Monoxide

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