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Gas Lab Manual

Physical Properties and Confirmatory Tests

The physical properties and specific chemical tests for the common gases in qualitative analysis are summarized in the following table.

GAS
COLOUR
ODOUR
H2
Colourless
Odourless
O2
Colourless
Odourless
CO2
Colourless
Odourless
H2O vapour
Colourless
Odourless
NH3
Colourless
Pungent
SO2
Colourless
Pungent, burning sulphur smell
HCl
Colourless/white fumes
Pungent
Cl2
Pale greenishyellow
Choking
NO2
brown
Pungent

 

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