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 :

  1. to increase the electrical conductivity of pure aluminium    
  2. to lower the melting point of Al2O3    
  3. to remove the impurities as slag    
  4. to increase the Al% in the yield    

The correct answer is: to lower the melting point of Al2O3

Related Questions to study

General
chemistry-


Which of the following statement is true ?


Which of the following statement is true ?

chemistry-General
General
chemistry-


To make the following reduction process spontaneous, temperature should be : Z n O plus C ⟶ Z n plus C O


To make the following reduction process spontaneous, temperature should be : Z n O plus C ⟶ Z n plus C O

chemistry-General
General
chemistry-

chemistry-General
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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 open square brackets A u left parenthesis C N right parenthesis subscript 2 end subscript close square brackets to the power of minus end exponent, 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 open square brackets Z n left parenthesis C N right parenthesis subscript 2 end subscript close square brackets to the power of 2 minus end exponentGold 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 open square brackets A u left parenthesis C N right parenthesis subscript 2 end subscript close square brackets to the power of minus end exponent, 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 open square brackets Z n left parenthesis C N right parenthesis subscript 2 end subscript close square brackets to the power of 2 minus end exponentGold 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
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
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
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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
General
chemistry-

The iron obtained from the blast furnace is called :

The iron obtained from the blast furnace is called :

chemistry-General
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
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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
General
maths-

Statement‐I: The function f left parenthesis x right parenthesis equals not stretchy integral subscript 0 end subscript superscript x end superscript square root of 1 plus t to the power of 2 end exponent end root d t is an odd function and g left parenthesis x right parenthesis equals f to the power of ’ end exponent left parenthesis x right parenthesis is an even function.
Statement‐II: For a differentiable function f left parenthesis x right parenthesis if f to the power of ’ end exponent left parenthesis x right parenthesis is an even function then f left parenthesis x right parenthesis is an odd function.

Statement‐I: The function f left parenthesis x right parenthesis equals not stretchy integral subscript 0 end subscript superscript x end superscript square root of 1 plus t to the power of 2 end exponent end root d t is an odd function and g left parenthesis x right parenthesis equals f to the power of ’ end exponent left parenthesis x right parenthesis is an even function.
Statement‐II: For a differentiable function f left parenthesis x right parenthesis if f to the power of ’ end exponent left parenthesis x right parenthesis is an even function then f left parenthesis x right parenthesis is an odd function.

maths-General
General
maths-

Statement‐I:: not stretchy integral subscript blank superscript blank 2 to the power of t a n to the power of negative 1 end exponent x end exponent d left parenthesis c o t to the power of negative 1 end exponent x right parenthesis equals fraction numerator 2 to the power of t w to the power of negative 1 end exponent x end exponent over denominator l n 2 end fraction plus c
Statement‐II : fraction numerator d over denominator d x end fraction left parenthesis a to the power of x end exponent plus c right parenthesis equals a to the power of x end exponent l n a

Statement‐I:: not stretchy integral subscript blank superscript blank 2 to the power of t a n to the power of negative 1 end exponent x end exponent d left parenthesis c o t to the power of negative 1 end exponent x right parenthesis equals fraction numerator 2 to the power of t w to the power of negative 1 end exponent x end exponent over denominator l n 2 end fraction plus c
Statement‐II : fraction numerator d over denominator d x end fraction left parenthesis a to the power of x end exponent plus c right parenthesis equals a to the power of x end exponent l n a

maths-General
parallel
General
maths-

The value of not stretchy integral subscript blank superscript blank blank x. fraction numerator l n left parenthesis x plus square root of 1 plus x to the power of 2 end exponent end root right parenthesis over denominator square root of 1 plus x to the power of 2 end exponent end root end fraction d x equals:

The value of not stretchy integral subscript blank superscript blank blank x. fraction numerator l n left parenthesis x plus square root of 1 plus x to the power of 2 end exponent end root right parenthesis over denominator square root of 1 plus x to the power of 2 end exponent end root end fraction d x equals:

maths-General
General
maths-

not stretchy integral subscript blank superscript blank fraction numerator d x over denominator blank c o s blank x minus blank s i n blank x end fraction is equal to‐

not stretchy integral subscript blank superscript blank fraction numerator d x over denominator blank c o s blank x minus blank s i n blank x end fraction is equal to‐

maths-General
General
maths-

not stretchy integral subscript blank superscript blank fraction numerator x to the power of 4 end exponent minus 4 over denominator x to the power of 2 end exponent square root of 4 plus x to the power of 2 end exponent plus x to the power of 4 end exponent end root end fraction d x equals‐

not stretchy integral subscript blank superscript blank fraction numerator x to the power of 4 end exponent minus 4 over denominator x to the power of 2 end exponent square root of 4 plus x to the power of 2 end exponent plus x to the power of 4 end exponent end root end fraction d x equals‐

maths-General
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