Therefore option (B) Al metal cannot be extracted by the carbon reduction process. Note: It should be noted that during the extraction process, and reducing an oxide ore to metal, if carbon is used it is oxidized to carbon monoxide, and if carbon monoxide is used, it is oxidized to carbon dioxide.
Which ore is extracted by leaching?
Cyanide leaching (e.g. gold ore) Ammonia leaching (e.g. crushed ore) Alkali leaching (e.g. bauxite ore)
Which metal can be extracted from its ore?
Extraction using carbon
Metals such as zinc, iron and copper are present in ores as their oxides. Each of these oxides is heated with carbon to obtain the metal. The metal oxide loses oxygen, and is therefore reduced.
What type of metal does not need to be extracted from an ore?
Platinum, gold, silver and copper can occur native and do not need to be extracted. The reactivity of a metal determines how it is extracted. Metals are often found combined with oxygen as oxides.
What is an example of leaching method?
The leaching process example includes the leaching of bauxite or Al₂O₃ . Another example of the process of leaching is leaching of the noble metals like silver and gold in the presence of the dilute aqueous solutions of either potassium cyanide or sodium cyanide in the presence of air. …
What is leaching give an example?
In agriculture, leaching is the loss of water-soluble plant nutrients from the soil, due to rain and irrigation. Soil structure, crop planting, type and application rates of fertilizers, and other factors are taken into account to avoid excessive nutrient loss. Example:- Red and yellow soil is formed due to leaching.
How is leaching carried out?
For low grade copper ores, leaching is carried out with acid or bacteria in the presence of air. During this process, copper goes into the solution as Cu2+ ions. The solution is then reacted with scrap iron or H2 to get metallic copper.
How is silver extracted?
How and where is silver extracted? Silver ore is mined through both open-pit and underground methods. The open pit method involves using heavy machinery to mine deposits relatively near the earth’s surface. In underground mining, deep shafts are dug into the ground to extract ore.
What is an ore Class 12?
The naturally occurring chemical substances in the earth’s crust which are obtained by mining are known as minerals. … Minerals which can be used as a source for commercial recovery of a desired substance are termed as ores.
What is leaching method explain by suitable example class 12?
Leaching is the process in which the ore is concentrated by chemical reaction with a suitable reagent which dissolves the ore but not the impurities, e.g., bauxite is leached with a hot concentrated solution of NaOH which dissolves aluminium while other oxides (Fe2O3, TiO2, SiO2), remain undissolved and noble metals ( …
Is leaching a chemical reaction?
From its commercial applications to the environmental concerns surrounding it, leaching is a very well known chemical process.
Which metal is extracted by hydrometallurgy?
Definition – What does Hydrometallurgy mean? This is a method of metal or metal compound extraction from an ore through pre-treatments that involve the use of a leaching agent, separation of impurities and precipitation. It is used in the extraction of uranium, gold, zinc, silver and copper from low-grade ores.
What is called leaching?
Leaching is the loss or extraction of certain materials from a carrier into a liquid (usually, but not always a solvent). and may refer to: Leaching (agriculture), the loss of water-soluble plant nutrients from the soil; or applying a small amount of excess irrigation to avoid soil salinity.
Which of the following is used for leaching?
Explanation: lixivation is common leaching process used for removing alkali from wood ashes. Explanation: To get the leached product the solvents are used at its boiling point is known as decoction. Explanation: Generally elution is the process of removing soluble materials from the solids.
In which soil leaching is most common?
What soil type is most prone to leaching? The more porous the soil, the easier it is for chemicals to pass through. Pure sand is probably the best leaching type, but isn’t very hospitable to garden plants. In general, the more sand your garden soil has, the more likely it is that you will have excess leaching.
What is the difference between Eluviation and leaching?
Eluviation is the movement of water that removes dissolved or suspended material from a layer or layers of soil when rainfall exceeds evaporation. Leaching is the term used to describe the loss of material in the solution.
What is meant by leaching Class 8?
Leaching occurs when extra precipitation, flooding or drainage, extracts water-soluble nutrients from the soil. The lost particles are transported downwards and are usually repositioned in a lower layer. This transport results in a porous and accessible upper layer and a dense, rigid lower layer.
Which metal is easiest to extract from its ore?
Many metals can be reduced and extracted in a school laboratory. The easiest are iron, copper and lead.
What metal is produced in a blast furnace?
Blast furnaces produce pig iron from iron ore by the reducing action of carbon (supplied as coke) at a high temperature in the presence of a fluxing agent such as limestone.
Is copper found uncombined?
Overview. Copper was one of the earliest elements known to man. At one time, it could be found lying on the ground in its native state or uncombined state. … Copper is a transition metal, one of several elements found in rows 4 through 7 between Groups 2 and 13 in the periodic table.
What are the two main types of metal extraction?
Extraction of metals
There are two types of mines to obtain metals: Surface mining that is used when the mineral is near the surface. Underground mining that is used when the mineral is deep below the surface.
What is used in metal extraction?
carbon can be used to extract metals from some metal oxides. A metal can either be reduced or oxidised in a reaction. … oxidation occurs when a metal (or carbon) gains oxygen, to form an oxcide compound.