| Hydrogen sulphide | Ammonia | Sulphur dioxide | Hydrogen chloride | |
| Shake the gas with red litmus solution | ||||
| Shake the gas with blue litmus solution | ||||
| Apply a burning splint to a gas |
| Hydrogen sulphide | Ammonia | Sulphur dioxide | Hydrogen chloride | |
| Shake the gas with red litmus solution | No change in the colour of litmus solution | Red litmus solution becomes blue in colour. | No change in the colour of litmus solution | No change in the colour of litmus solution |
| Shake the gas with blue litmus solution | Blue litmus solution becomes red in colour. | No change in the colour of blue litmus solution. | Blue litmus solution becomes red in colour. | Blue litmus solution becomes red in colour |
| Apply a burning splint to a gas | No reaction. | No reaction. | No reaction. | No reaction. |
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