Answer:
Other substances that give a positive test with AgNO3 are other chlorides present, iodides and bromide. However iodides and bromides have different colours hence they will not give a false positive test for KCl. Other chlorides present may lead to a false positive test for KCl.
Explanation:
In the qualitative determination of halogen ions, silver nitrate solution is used. Various halide ions give various colours of precipitate with silver nitrate. Chlorides yield a white precipitate, bromides yield a cream precipitate while iodides yield a yellow precipitate. All these ions or some of them may be present in the system.
However, if other chlorides are present, they will also yield a white precipitate just as KCl leading to a false positive test for KCl. Since other halogen ions yield precipitates of different colours, they don't lead to a false test for KCl. We can exclude other halides from the tendency to lead us to a false positive test for KCl but not other chlorides.
The boiling point of a liquid can be raised by adding pressure. Like wise, if you lower the pressure the boiling point goes down. This can be explained by the fact that boiling occurse when the vapor pressure equals the outside pressure so when the outside pressure rises the vapor pressure required for boiling also rises. Vapor pressure is proportional to temperature and therefore temperature needs to increase to make the vapor pressure increase.
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A). 4
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Answer=C
Mobile electrons bring about high electrical conductivity
Wear gloves when handling chemicals.
Make sure that none of the liquids near the Bunsen burner are flammable.
Explanation:
The safety precautions the student must apply while completing his experiment is that he/she must wear gloves while handling the chemicals and they must make sure that none of the liquids near the Bunsen burner are flammable.
- Safety guidelines provides a detailed and careful way to carry out experiment and observations in the laboratory.
- This is all in a bid to accidents in the workspace.
- It is a good practices to wear gloves and laboratory coat while handling chemicals.
- Also make sure to put out the Bunsen burner when not in use.
- Keep papers and books away from the work area. Chemicals and papers are not friends.
- Ensure that flammable liquids are not close to the Burner.
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Safety cautions brainly.com/question/4543399
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