Chemistry-
General
Easy

Question

Dow's process of extraction of Mg involves extraction of Mg from sea water. Sea water is concentrated in sun light and is then treated with slaked lime. Magnesium hydroxide is heated in a stream of HCl to give MgCl2 which is electrolysed to discharge Mg. The mixture is in the ratio 35 percent sign M g C l subscript 2 end subscript plus 50 percent sign N a C l plus 15 percent sign C a C l subscript 2 end subscript times N a C l blank a n d blank C a C l subscript 2 end subscript are added to lower the fusion temperature and to increase the conductance.
M g to the power of 2 plus end exponent plus C a left parenthesis O H right parenthesis subscript 2 end subscript ⟶ M g left parenthesis O H right parenthesis subscript 2 end subscript plus C a to the power of 2 plus end exponent
M g left parenthesis O H right parenthesis subscript 2 end subscript plus 2 H C l ⟶ M g C l subscript 2 end subscript plus 2 H subscript 2 end subscript O blank left parenthesis l i q u i d right parenthesis
Electrolysis of fused MgCl2
electrolysed is protected from atmospheric oxidation by a blanket of inert gases.
M g to the power of 2 plus end exponent plus C a left parenthesis O H right parenthesis subscript 2 end subscript ⟶ M g left parenthesis O H right parenthesis subscript 2 end subscript downwards arrow plus C a to the power of 2 plus end exponent2 This reaction indicates :

  1. Mg(OH)2 is weaker base than Ca(OH)2    
  2. Solubility products of Mg(OH)2 is less than that of Ca(OH)2    
  3. Polarising power of Mg2+ is more than that of Ca2+ ion    
  4. Both (B) and (C).    

The correct answer is: Both (B) and (C).

Related Questions to study

General
chemistry-

Extraction of Aluminium can be understand by :  electrolytic reduction of Al2O3
Electrolyte : (Al2O3 + Cryolite) .
Cathode : Graphite inside the Fe container
Anode : Graphite rods
What is wrong if anode is made of nickel instead of graphite?

Extraction of Aluminium can be understand by :  electrolytic reduction of Al2O3
Electrolyte : (Al2O3 + Cryolite) .
Cathode : Graphite inside the Fe container
Anode : Graphite rods
What is wrong if anode is made of nickel instead of graphite?

chemistry-General
General
chemistry-

Extraction of Aluminium can be understand by :  electrolytic reduction of Al2O3
Electrolyte : (Al2O3 + Cryolite) .
Cathode : Graphite inside the Fe container
Anode : Graphite rods
The molten electrolytes contains N a to the power of plus end exponent comma A l to the power of 3 plus end exponent comma C a to the power of 2 plus end exponentbut only Al gets deposited at cathode because :

Extraction of Aluminium can be understand by :  electrolytic reduction of Al2O3
Electrolyte : (Al2O3 + Cryolite) .
Cathode : Graphite inside the Fe container
Anode : Graphite rods
The molten electrolytes contains N a to the power of plus end exponent comma A l to the power of 3 plus end exponent comma C a to the power of 2 plus end exponentbut only Al gets deposited at cathode because :

chemistry-General
General
chemistry-

Extraction of Aluminium can be understand by :  electrolytic reduction of Al2O3
Electrolyte : (Al2O3 + Cryolite) .
Cathode : Graphite inside the Fe container
Anode : Graphite rods
The function of fluorspar (CaF2) is :

Extraction of Aluminium can be understand by :  electrolytic reduction of Al2O3
Electrolyte : (Al2O3 + Cryolite) .
Cathode : Graphite inside the Fe container
Anode : Graphite rods
The function of fluorspar (CaF2) is :

chemistry-General
parallel
General
chemistry-

Extraction of Aluminium can be understand by :  electrolytic reduction of Al2O3
Electrolyte : (Al2O3 + Cryolite)
Cathode : Graphite inside the Fe container
Anode : Graphite rods
Coke powder is spreaded over the molten electrolyte due to :

Extraction of Aluminium can be understand by :  electrolytic reduction of Al2O3
Electrolyte : (Al2O3 + Cryolite)
Cathode : Graphite inside the Fe container
Anode : Graphite rods
Coke powder is spreaded over the molten electrolyte due to :

chemistry-General
General
chemistry-

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 :

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 :

chemistry-General
General
chemistry-


Which of the following statement is true ?


Which of the following statement is true ?

chemistry-General
parallel
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
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
parallel
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
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
parallel
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
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
parallel

card img

With Turito Academy.

card img

With Turito Foundation.

card img

Get an Expert Advice From Turito.

Turito Academy

card img

With Turito Academy.

Test Prep

card img

With Turito Foundation.