Points to Remember: Hydrogen is the most abundant element found in the universe. Hydrogen is much more common in the form of compounds. The most important compound of hydrogen is water. The chief sources of hydrogen are water, acids and alkalies. Hydrogen is prepared by the action of water, acids or alkalies on active metals. Electrolysis of water results in the formation of hydrogen and oxygen. Hydrogen is lighter than air. Hydrogen bums in air with pop sound. Hydrogen acts as a reducing agent. Hydrogen is used to produce oxyhydrogen flame and in weather forecast balloons. EXERCISE 1. FILL IN THE BLANKS: (a) Hydrogen is lighter than air. (b) Hydrogen is sparingly soluble in water. (c) Hydrogen bums with a oxyhydrogen pale blue flame and pop sound is heard. (d) A metal sodium hydrogen in the reactivity series gives hydrogen with water. (e) Hydrogen reacts with metal oxides to form metal and water . (f) Oxidation is the removal of hydro...
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