Chemistry-
General
Easy
Question
Extraction of Aluminium can be understand by : 
electrolytic reduction of Al2O3
Electrolyte : (Al2O3 + Cryolite) .
Cathode : Graphite inside the Fe container
Anode : Graphite rods
The purpose of adding cryolite is :
- to increase the electrical conductivity of pure aluminium
- to lower the melting point of Al2O3
- to remove the impurities as slag
- to increase the Al% in the yield
The correct answer is: to lower the melting point of Al2O3
Related Questions to study
chemistry-
Which of the following statement is true ?
Which of the following statement is true ?
chemistry-General
chemistry-
To make the following reduction process spontaneous, temperature should be : 
To make the following reduction process spontaneous, temperature should be :
chemistry-General
chemistry-
chemistry-General
chemistry-
Metallic gold frequently is found in aluminosilicate rocks and it is finely dispersed among other minerals. It may be extracted by treating the crushed rock with aerated sodium cyanide solution. During this process metallic gold is slowly converted to 
, which is soluble in water. After equilibrium has been reached, the aqueous phase is pumped off and the metallic gold is recovered from it by reacting the gold complex with zinc, which is converted to 
Gold in nature is frequently alloyed with silver which is also oxidised by aerated sodium cyanide solution.
There have been several efforts to develop alternative gold extraction processes which could replace this one. Why ?
Metallic gold frequently is found in aluminosilicate rocks and it is finely dispersed among other minerals. It may be extracted by treating the crushed rock with aerated sodium cyanide solution. During this process metallic gold is slowly converted to , which is soluble in water. After equilibrium has been reached, the aqueous phase is pumped off and the metallic gold is recovered from it by reacting the gold complex with zinc, which is converted to Gold in nature is frequently alloyed with silver which is also oxidised by aerated sodium cyanide solution.
There have been several efforts to develop alternative gold extraction processes which could replace this one. Why ?
chemistry-General
chemistry-
Statement-1 :Lead, tin and bismuth are purified by liquation method.
Statement-2 : Lead, tin and bismuth have low m.p. as compared to impurities
Statement-1 :Lead, tin and bismuth are purified by liquation method.
Statement-2 : Lead, tin and bismuth have low m.p. as compared to impurities
chemistry-General
chemistry-
Statement-1 :In the extraction of Ag the complex Na[Ag(CN)2] is reacted with Zn
Statement-2 :Zn is transition metal according to electronic theory
Statement-1 :In the extraction of Ag the complex Na[Ag(CN)2] is reacted with Zn
Statement-2 :Zn is transition metal according to electronic theory
chemistry-General
chemistry-
Statement-1 : During calcination the ore is heated well below its melting point in the limited supply of air or absence of air.
Statement-2 : The process of calcination is carried out for sulphide ores.
Statement-1 : During calcination the ore is heated well below its melting point in the limited supply of air or absence of air.
Statement-2 : The process of calcination is carried out for sulphide ores.
chemistry-General
chemistry-
The iron obtained from the blast furnace is called :
The iron obtained from the blast furnace is called :
chemistry-General
chemistry-
The process of bringing the metal or its ore into solution by the action of a suitable chemical reagent followed by extraction of the metal either by electrolysis or by a suitable precipitating agent i.e. more electropositive metal is called
The process of bringing the metal or its ore into solution by the action of a suitable chemical reagent followed by extraction of the metal either by electrolysis or by a suitable precipitating agent i.e. more electropositive metal is called
chemistry-General
chemistry-
In the froth floatation process for the purification of minerals the particles float because :
In the froth floatation process for the purification of minerals the particles float because :
chemistry-General
maths-
Statement‐I: The function 
is an odd function and 
is an even function.
Statement‐II: For a differentiable function 
if 
is an even function then is an odd function.
Statement‐I: The function is an odd function and is an even function.
Statement‐II: For a differentiable function if is an even function then is an odd function.
maths-General
maths-
Statement‐I:: 
Statement‐II : 
a
Statement‐I::
Statement‐II : a
maths-General
maths-
The value of 
equals:
The value of equals:
maths-General
maths-
is equal to‐
is equal to‐
maths-General
maths-
equals‐
equals‐
maths-General
