ICSE CHEMISTRY CLASS 10 - PRACTICAL CHEMISTRY
Identification of gases:
Gas |
Nature |
Test |
observation |
|
Oxygen
|
Neutral
|
Passed into
alkaline Pyrogallol
|
Dark brown
|
|
Carbon dioxide
|
Slightly acidic –
turns blue litmus to faint red
|
- lime water
- acidified KMnO4
and
- K2Cr2O7
|
Turns milky
No effect
No effect
|
|
Sulphur dioxide
|
Acidic in nature
|
- lime water
- acidified KMnO4
and
- K2Cr2O7
|
Turns milky
Decolourizes
Turns clear green
solution
|
|
Hydrogen sulphide
|
Acidic in nature
|
Lead acetate
paper
|
Turns silvery
black
|
|
Chlorine
|
Acidic – turns blue
litmus to red then bleaches
|
Starch iodide
paper
|
Turns blue black
|
|
Nitrogen dioxide
|
Acidic
|
Potassium iodide
crystals
|
Violet fumes
|
|
Hydrogen chloride
gas
|
Acidic
|
Exposed to Glass
rod dipped in Ammonia solution
|
Dense white fumes
|
|
Ammonia gas
|
Basic in nature
|
Exposed to Glass
rod dipped in Conc. Hydrochloric acid.
|
Dense white fumes
|
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