Being electropositive, aluminium has a high affinity for oxygen and can not be extracted through smelting.
What metals are not extracted by smelting and explain why?
Solution : (a) Aluminium cannot be extracted by the smelting process because :
(i) `Al`is highly electropositive element and has strong affinity for oxygen. Hence, `Al_(2) O_(3)` is a very stable compound and is not reduced by carbon.
Why can’t aluminium be extracted the same way as iron?
Aluminium is more reactive than carbon so it must be extracted from its compounds using electrolysis . Even though aluminium is more abundant than iron in the Earth’s crust , aluminium is more expensive than iron. This is mainly because of the large amounts of electrical energy used in the extraction process.
Which metal Cannot be used for smelting?
Zn cannot be used as a reducing agent is smelting.
Why aluminium Cannot be extracted from its ore by heating with carbon?
Model Answer
Electrolysis is used to extract aluminium from its ore as aluminium is more reactive than carbon therefore cannot be extracted by carbon. Any metal in the reactivity series above carbon must be extracted using electrolysis as it to too reactive.
Why are different methods used to extract aluminium and iron from their ores?
The reactivity of the metal determines the reduction method used. Reactive metals such as aluminium are extracted using electrolysis, as they are more reactive than the usual reducing agents used. Iron is not as reactive as aluminium and its ore can be reduced by the reducing agent carbon and carbon monoxide.
Which metals can be extracted by smelting?
Lead, iron and zinc can be extracted by smelting process .
Why does aluminum not rust?
Shifting atoms
structure changes just enough to become chemically inert and thus unable to react rapidly with additional water molecules or atmospheric oxygen. This change in molecular structure is why aluminum oxide metal resists corrosion.
What method would you use to extract aluminium from its ore?
Aluminium ore is called bauxite . The bauxite is purified to produce aluminium oxide, a white powder from which aluminium can be extracted. The extraction is done by electrolysis.
Is aluminum a cathode or anode?
Typically, Copper Foil is used as the negative electrode for the anode and aluminium is used as the positive elecrode for the cathode.
Can aluminium be used as reducing agent in smelting?
Solution : Carbon , sodium and aluminium are used as powerful reducing agents in smelting.
What is the difference between smelting and refining?
In metallurgy, refining consists of purifying an impure metal. It is to be distinguished from other processes such as smelting and calcining in that those two involve a chemical change to the raw material, whereas in refining, the final material is usually identical chemically to the original one, only it is purer.
Which of the following metal can not be extracted?
Therefore option (B) Al metal cannot be extracted by the carbon reduction process.
Why is aluminium not extracted from its ore by chemical reduction with coke?
Due to the high melting point and poor conduction of heat, aluminium is not extracted by reduction of its ores.
Why heating aluminium oxide and carbon does not produce aluminium?
Simply heating aluminum oxide with carbon to very high temperatures will not produce any aluminum metal. No reaction will occur in this case as carbon is simply not a powerful enough reducing agent to reduce the aluminum oxide.
Why is bauxite used for the extraction of aluminum?
The ore is then concentrated by a chemical process. Bauxite is the name given to aluminium ore. To generate aluminium oxide, bauxite is purified, a white powder from which aluminium can be extracted. Aluminium oxide has a very high melting point of more than 2000° C which makes melting very expensive.
What is the hardest metal to extract?
1. Tungsten (1960–2450 MPa) Tungsten is one of the hardest metals you will find in nature. Also known as Wolfram, the rare chemical element exhibits a high density (19.25 g/cm3) as well as a high melting point (3422 °C/ 6192 °F).
Which metal is hardest to extract from its ore?
The correct option is D Sodium
Which metal Cannot be extracted by electrolysis?
Copper is not extracted by electrolysis. Rest other elements such as sodium, aluminium, magnesium are extracted by electrolysis.
What is the difference between melting and smelting?
Melting: Melting is the process by which a substance changes from the solid phase to the liquid phase. Smelting: Smelting is the process by which a metal is obtained at temperatures beyond the melting point from its ore.
What do you mean by smelting?
Smelting is a form of extractive metallurgy to produce a metal from its ore. Smelting uses heat and a chemical reducing agent to decompose the ore, driving off other elements as gasses or slag and leaving just the metal behind. The reducing agent is commonly a source of carbon such as coke, charcoal, and coal.