Hydrogen

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Hydrogen is a topic covered in Chapter 7 of the ICSE Class 8 Chemistry textbook. Here are some key facts about hydrogen:
Properties:
Hydrogen is a colorless, odorless, and tasteless gas with the lowest density of all gases. It is the simplest element, consisting of one proton and one electron.
Abundance: Hydrogen is the most abundant element in the universe, making up almost 75% of its mass. It is present in water, in almost all living things, and in the atmosphere.
Uses:
Hydrogen is used as a rocket fuel, in the production of fertilizer, and in the chemical industry. It is also considered a clean fuel of the future because it can be generated from water and returned to water when oxidized.
Preparation:
In a laboratory, hydrogen can be made by reacting zinc with sulfuric acid.
Separation: Hydrogen can be separated from carbon dioxide by passing the mixture through water under pressure.
Tests:
Hydrogen can be tested for its properties.