![]() It is highly reactive, though the metal is protected by a surface layer of inert transparent oxide (Al 2 O 3) that forms rapidly in air, providing excellent corrosion resistance. For example, sodium reacts with water: sodium + water sodium hydroxide + hydrogen. Aluminium is soft, lightweight and ductile with excellent thermal and electrical conductivity. Water and soil The concentration of aluminum in natural waters (e.g., ponds, lakes, streams) is generally below 0.1 milligrams per liter (mg/L). The alkali metals react with water to produce a metal hydroxide and hydrogen. Aluminum levels in urban and industrial areas may be higher and can range from 0.4 to 8.0 ìg/m 3. Here it is to be noted that nitric acid is a very strong oxidising agent and it oxidises Al readily to its corresponding oxide. Most of the aluminum in the air is in the form of small suspended particles of soil (dust). When Aluminum is dipped in nitric acid its reactivity decreases as the oxide formation takes place on the surface of metal. Silver metal is stable in clean air under normal conditions. It has a great affinity towards oxygen, forming a protective layer of oxide on the surface when exposed to air. 3 Ag (s) + 4 HNO 3 (aq) AgNO 3 (aq) + NO (g) + 2 H 2 O (l) Reaction of silver with air. ![]() Silver dissolves in dilute nitric acid, HNO 3 8. One more thing, when aluminum is dipped the reactive of aluminum decreases because of the formation of the oxide layer.Īssertion is Correct but the reason is not correct. Silver metal dissolves in hot concentrated sulphuric acid. The +3 oxidation states are favorable except for the heavier elements, such as Tl, which prefer the +1 oxidation state due to its stability. The boron family adopts oxidation states +3 or +1. ![]() Aluminium reacts quickly to form a surface layer. ![]() Aluminium is the fastest and copper is the slowest of the six. react with oxygen in the air to form the metal oxide. Hint: Whenever aluminum is dipped in nitric acid, it oxidizes aluminum and a protective layer of $A$, aluminum oxide on the surface. The boron family contains the semi-metal boron (B) and metals aluminum (Al), gallium (Ga), indium (In), and thallium (Tl). Metals in the reactivity series from aluminium to copper. ![]()
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