Access courses anytime, anywhere on the go. One of the common compounds formed by metals is metal oxide. The reactions of the Group 2 metals with air rather than oxygen is complicated by the fact that they all react with nitrogen to produce nitrides. The density of metals is usually high. For CBSE Class 11 and Class 12, subjects available are Physics and Chemistry. Metals are natural compounds of earth’s crust, in which they are generally found in the form of metal ores, associated both with each other and with many other elements. They are also naturally present in the rocks washed by surface water and groundwater and in atmospheric dust. Whenever sodium or potassium is exposed to air it catches fire. 4Na (s) + O2 (g) —>2 Na2O (s) 4K (s) + + O2 (g) —>2 K20 (s) LearnFatafat is best to prepare for various competitive exams and Olympiads. What is microorganism? You can buy LearnFatafat Course in SD Card or Memory Card in which you can watch video lessons based on your course syllabus. Some metals react less vigorously with oxygen, forming a powdery metal oxide that coats the metal’s surface. Sodium is ordinarily quite reactive with air, and the reactivity is a function of the relative humidity, or water-vapour content of the air. 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Metals which fall below hydrogen in the reactivity series does not react with dilute acids. Reaction of Metals With Metal Salts. Put a piece of coal (carbon) in a test tube then add some dilute HCl to it. A number of metals, including iron and zinc , do not react to the oxygen in dry air; however, when both water and oxygen are present, as in moist air, these metals form a metal oxide through a process called corrosion . Amphoteric Oxides: Some metal oxide such as zinc oxide and aluminium oxide react with both acid and bases to produce salt and water hence these are called Amphoteric Oxides. Some metals like sodium and potassium react vigorously with oxygen. A lot of heat generated in this reaction. Ltd. 3Fe + 4H2O → Fe3O4 + 4H2. There is excellent quality content from authorized subject matter experts. Any references taken from NCERT books are not our copyrights. Aluminium develops thin oxide layer on exposure to air. Group 1, … Chemical properties. 4K + O2 → 2K2O. 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