Recognition and Identification of common gases

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Section 1

Question Answer
Oxygen (O2)Insert a glowing splint into the gas. The splint relights
Carbon dioxide (CO2)Bubble the gas through lime water. The lime water turns milky / forms whit ppt
Ammonia (NH3) 1Insert a piece of moist red litmus paper into gas. The moist red litmus paper turns blue.
Ammonia (NH3) 2Dip a glass rod into dilute hydrochloric acid and insert it into the gas, Dense fumes are formed.
Nitrogen dioxide (NO2) 1Appearance of color of gas. Brown gas (insoluble in organic solvents)
Nitrogen dioxide (NO2) 2Add starch - iodide paper. Gas turns starch iodide paper blue black
Hydrogen (H2)Insert a burning splint into gas. Burning splint goes off with a "pop" sound. (colorless gas)
Hydrogen chloride (HCl) 1Dip a glass rod in aqueous ammonia and insert into the gas Dense white fumes are formed
Hydrogen chloride (HCl) 2Test with blue litmus paper. The steamy fumes produced changes blue litmus to red.
Chlorine (Cl2)Insert a piece of moist blue litmus paper into the gas. The pale green gas turns moist blue litmus paper to red and then it bleaches it.
Bromine (Br2)Appearance or color of gas. Brown gas which dissolves in organic solvents.
Water vapor. (H2O)Insert a piece of blue anhydrous cobalt(II) chloride paper into the gas. The blue cobalt chloride paper turns pink.
Sulphur dioxide (SO2)Pass the gas through acidified potassium dichromate (VI) solution. Orange color turns to green.

Section 2