(A) Alumina has hgih condutivity (R ) The mixture of alumia and cryolite is used for electrolytic reduction in order to extract aluminium

(A) Alumina has hgih condutivity (R ) The mixture of alumia and cryolite is used for electrolytic reduction in order to extract aluminium
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(A) Alumina has hgih condutivity (R ) The mixture of alumia and cryolite is used for electrolytic reduction ... (A) is incorrect but (R ) is correct
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The metallic aluminium is obtained from pure alumina in the presence of fused cryolite by (A) Electrolysis (B) Electrolytic reduction (C) Electrolytic oxidation (D) None of these

Description : The metallic aluminium is obtained from pure alumina in the presence of fused cryolite by (A) Electrolysis (B) Electrolytic reduction (C) Electrolytic oxidation (D) None of these

Last Answer : (B) Electrolytic reduction

The function of adding cryolite in the electrolytic reduction of alumina by Hall-Heroult process is to

Description : The function of adding cryolite in the electrolytic reduction of alumina by Hall-Heroult process is to

Last Answer : The function of adding cryolite in the electrolytic reduction of alumina by Hall-Heroult ... D. increase the electrical canductivity of alumina

Statement -I :Cryolite is used in electrolytic extraction of Al from alumuna.Statement -2: It dissilves alumina

Description : Statement -I :Cryolite is used in electrolytic extraction of Al from alumuna.Statement -2: It dissilves alumina

Last Answer : Statement -I :Cryolite is used in electrolytic extraction of Al from alumuna. Statement -2: It dissilves alumina

Electrolytic reduction cell used for conversion of calcined Al2O3to Al is a carbon lined furnace operating at 800-900 °C. The purpose of electric current supplied to the furnace is to (A) Achieve very high purity of aluminium (99.9%) (B) Keep the electrolyte in liquid condition by the generation of heat (C) Electrolytically dissociate alumina (D) Both (B) & (C)

Description : Electrolytic reduction cell used for conversion of calcined Al2O3to Al is a carbon lined furnace operating at 800-900 °C. The purpose of electric current supplied to the furnace is to (A) Achieve very high ... by the generation of heat (C) Electrolytically dissociate alumina (D) Both (B) & (C)

Last Answer : (D) Both (B) & (C)

Electrolytic reduction of `Al_(2)O_(3)`. Electrolyte (`Al_(2)O_(3)+"cryolite")` Anode: Graphite rods. Coke powder is spreadded over the molten electro

Description : Electrolytic reduction of `Al_(2)O_(3)`. Electrolyte (`Al_(2)O_(3)+"cryolite")` Anode: Graphite rods. Coke powder is spreadded over the molten electro

Last Answer : Electrolytic reduction of `Al_(2)O_(3)`. Electrolyte (`Al_(2)O_(3)+"cryolite")` Anode: Graphite rods. ... of molten aluminium by air D. (a) both (b)

Electrolytic reduction of `Al_(2)O_(3)`. Electrolyte (`Al_(2)O_(3)+"cryolite")` Anode: Graphite rods. The purpose of adding crylite is :

Description : Electrolytic reduction of `Al_(2)O_(3)`. Electrolyte (`Al_(2)O_(3)+"cryolite")` Anode: Graphite rods. The purpose of adding crylite is :

Last Answer : Electrolytic reduction of `Al_(2)O_(3)`. Electrolyte (`Al_(2)O_(3)+"cryolite")` Anode: Graphite rods. ... . to increase melting point of `Al_(2)O_(3)`

Electrolytic reduction of `Al_(2)O_(3)`. Electrolyte (`Al_(2)O_(3)+"cryolite")` Anode: Graphite rods. What is wrong if anode is made of nickel instant

Description : Electrolytic reduction of `Al_(2)O_(3)`. Electrolyte (`Al_(2)O_(3)+"cryolite")` Anode: Graphite rods. What is wrong if anode is made of nickel instant

Last Answer : Electrolytic reduction of `Al_(2)O_(3)`. Electrolyte (`Al_(2)O_(3)+"cryolite")` Anode: Graphite ... CO D. Nickel May be affected by high temperature.

The major role of flourspar, `CaF_(2)` which is added in small amount in the electrolytic reduction of `Al_(2)O_(3)` dissolved on fused cryolite in fu

Description : The major role of flourspar, `CaF_(2)` which is added in small amount in the electrolytic reduction of `Al_(2)O_(3)` dissolved on fused cryolite in fu

Last Answer : The major role of flourspar, `CaF_(2)` which is added in small amount in the electrolytic reduction ... the rate of oxidation of carbon at the anode

The major role of fluorpar (`CaF_2` ) which added in small quantities in the electrolyte reduction of alumina dissolved in fused cryolite `(N_(3)AlF_(

Description : The major role of fluorpar (`CaF_2` ) which added in small quantities in the electrolyte reduction of alumina dissolved in fused cryolite `(N_(3)AlF_(

Last Answer : The major role of fluorpar (`CaF_2` ) which added in small quantities in the electrolyte reduction ... the rate of oxidation of carbon at the anode

Electrolytic reduction of alumina to aluminum by the Hall-Heroult process is carried out

Description : Electrolytic reduction of alumina to aluminum by the Hall-Heroult process is carried out

Last Answer : Electrolytic reduction of alumina to aluminum by the Hall-Heroult process is carried out A. In ... which forms a melt with higher melting temparature.

During electrolytic reduction of alumina , two auxiliary electrolytes X and Y are added to increase the electrical conductance and lower the temperatu

Description : During electrolytic reduction of alumina , two auxiliary electrolytes X and Y are added to increase the electrical conductance and lower the temperatu

Last Answer : During electrolytic reduction of alumina , two auxiliary electrolytes X and Y are added to increase ... . alum and flourspar D. flourspar and bauxite

Describe electrolytic reduction of alumina.

Description : Describe electrolytic reduction of alumina.

Last Answer : i) Aluminium is extracted from alumina by electrolysis of mixture of alumina (20%) , Cryolite (60%) & Calcium fluoride (20%). Addition of cryolite& fluorspar not only makes alumina a ... set free at the cathode is removed periodically in the molten condition from bottom of the cell.

Statement -1 In the electltic reduction of `Al_(2)O_(3)`cryolite is used . Statement -2: Cryolite si an ore of aluminium

Description : Statement -1 In the electltic reduction of `Al_(2)O_(3)`cryolite is used . Statement -2: Cryolite si an ore of aluminium

Last Answer : Statement -1 In the electltic reduction of `Al_(2)O_(3)`cryolite is used . Statement -2: Cryolite si an ore of aluminium

Aluminium is extracted from bauxite (a) By reduction with carbon (b) By reduction with Mg (c) By reduction with CO (d) By electrolysis in molten cryolite

Description : Aluminium is extracted from bauxite (a) By reduction with carbon (b) By reduction with Mg (c) By reduction with CO (d) By electrolysis in molten cryolite

Last Answer : Ans:(d)

Electrolytic reducation of `Al_(2)O_(3)` Electrolyte `(Al_(2)O_(3)+cryolite)` Cathode : fraphite inside Fe -Container Coke power is spreased over the

Description : Electrolytic reducation of `Al_(2)O_(3)` Electrolyte `(Al_(2)O_(3)+cryolite)` Cathode : fraphite inside Fe -Container Coke power is spreased over the

Last Answer : Electrolytic reducation of `Al_(2)O_(3)` Electrolyte `(Al_(2)O_(3)+cryolite)` Cathode : fraphite inside Fe ... aluminmum by air D. (A) and (B) both

Electrolytic reducation of `Al_(2)O_(3)` Electrolyte `(Al_(2)O_(3)+cryolite) ` Cathode : fraphite inside Fe -Container The purpose of adding cryolite

Description : Electrolytic reducation of `Al_(2)O_(3)` Electrolyte `(Al_(2)O_(3)+cryolite) ` Cathode : fraphite inside Fe -Container The purpose of adding cryolite

Last Answer : Electrolytic reducation of `Al_(2)O_(3)` Electrolyte `(Al_(2)O_(3)+cryolite) ` Cathode : fraphite inside ... the impurities as slag D. Both (a) & (B)

Electrolytic reducation of `Al_(2)O_(3)` Electrolyte `(Al_(2)O_(3)+cryolite)` Cathode : fraphite inside Fe -Container Pick out the statement which is

Description : Electrolytic reducation of `Al_(2)O_(3)` Electrolyte `(Al_(2)O_(3)+cryolite)` Cathode : fraphite inside Fe -Container Pick out the statement which is

Last Answer : Electrolytic reducation of `Al_(2)O_(3)` Electrolyte `(Al_(2)O_(3)+cryolite)` Cathode : fraphite ... 2)` D. nikkel may be affected at high temperature

In the electrolusis of alumina. Cryolite is absorbed to

Description : In the electrolusis of alumina. Cryolite is absorbed to

Last Answer : In the electrolusis of alumina. Cryolite is absorbed to A. Lower that melting point of alumia B ... the anode effect D. Remove impurities form alumia

Although thermodynamically feasible, in practice, Magnesium metal is not used for the reduction of Alumina in the metallurgy of aluminium.Why?

Description : Although thermodynamically feasible, in practice, Magnesium metal is not used for the reduction of Alumina in the metallurgy of aluminium.Why?

Last Answer : Ans. : Below the temperature(1623 K) correspoinding to the point of intersection of Al 2O3 and MgO curves in Ellingham diagram, Magnesium can reduce Alumina because the ΔfG o value of Al2O3 at ... to Al. But Magnesium is much costier metal than Aluminium and hence the process will be uneconomical.

36. Aluminium is extracted from alumina (Al2O3 ) by electrolysis of a molten mixture of : (1) Al2O3 + KF + Na3AlF6 (2) Al2O3 + HF + NaAlF4 (3) Al2O3 + CaF2 + NaAlF4 (4) Al2O3 + Na3AlF6 + CaF2

Description : 36. Aluminium is extracted from alumina (Al2O3 ) by electrolysis of a molten mixture of : (1) Al2O3 + KF + Na3AlF6 (2) Al2O3 + HF + NaAlF4 (3) Al2O3 + CaF2 + NaAlF4 (4) Al2O3 + Na3AlF6 + CaF2

Last Answer : Al2O3 + Na3AlF6 + CaF2

In the elactrolytic extraction of aluminium, cryolite is used.

Description : In the elactrolytic extraction of aluminium, cryolite is used.

Last Answer : In the elactrolytic extraction of aluminium, cryolite is used. A. Lower the melting point of ... impurities from alumina D. Minimise the anodic effect

The important ore of aluminium is – (1) bauxite (2) cryolite (3) fluorspar (4) haematite

Description : The important ore of aluminium is – (1) bauxite (2) cryolite (3) fluorspar (4) haematite

Last Answer : (1) bauxite Explanation: Bauxite is an aluminium ore and is the main source of aluminium. This form of rock consists mostly of the minerals gibbsite, boehmite and diaspore , in a mixture ... it was first recognized as containing aluminium and named by the French geologist Pierre Berthier in 1821.

What is the role of molten cryolite in the extraction of aluminium?

Description : What is the role of molten cryolite in the extraction of aluminium?

Last Answer : When pure alumina is mixed with molten cryolite, it forms an electrolyte at 1223K. Molten cryolite also acts as a solvent for alumina.

Identify the correct statement with reference to the extractive metallurgy of aluminium. (A) The electrolyte consists of molten Na3AlF6 with approximately 1 to 8% Al2O3 (B) Approximately 80% of the aluminium deposited on the cathode comes from cryolite (C) Sodium is deposited along with aluminium, but is immediately vaporised (D) Anode effect sets in when the cryolite concentration goes below 40%.

Description : Identify the correct statement with reference to the extractive metallurgy of aluminium. (A) The electrolyte consists of molten Na3AlF6 with approximately 1 to 8% Al2O3 (B) Approximately 80% of ... is immediately vaporised (D) Anode effect sets in when the cryolite concentration goes below 40%.

Last Answer : (A) The electrolyte consists of molten Na3AlF6 with approximately 1 to 8% Al2O3

The important ore of aluminium is (1) bauxite (2) cryolite (3) fluorspar (4) haematite

Description : The important ore of aluminium is (1) bauxite (2) cryolite (3) fluorspar (4) haematite

Last Answer : bauxite

In a single stage extraction process, 10 kg of pure solvent S (containing no solute A) is mixed with 30 kg of feed F containing A at a mass fraction xf = 0.2. The mixture splits into an extract phase E and a raffinate phase R containing A at xB = 0.5 and xR = 0.05 respectively. The total mass of the extract phase is (in Kg) (A) 6.89 (B) 8.89 (C) 10 (D) 8.25

Description : In a single stage extraction process, 10 kg of pure solvent S (containing no solute A) is mixed with 30 kg of feed F containing A at a mass fraction xf = 0.2. The mixture splits into an extract phase E and a raffinate ... phase is (in Kg) (A) 6.89 (B) 8.89 (C) 10 (D) 8.25

Last Answer : (B) 8.89

The cathode used in the electrolytic cell during aluminium extraction is made of

Description : The cathode used in the electrolytic cell during aluminium extraction is made of

Last Answer : The cathode used in the electrolytic cell during aluminium extraction is made of A. Aluminium B. Carbon lining C. Iron D. Steel

Extraction of __________ employs an electrolytic process. (A) Aluminium (B) Silver (C) Copper (D) All (A), (B) and (C)

Description : Extraction of __________ employs an electrolytic process. (A) Aluminium (B) Silver (C) Copper (D) All (A), (B) and (C)

Last Answer : (A) Aluminium

Which of the following metals is not subjected to electrolytic refining/purification? (A) Copper (B) Zinc (C) Tin (D) Aluminium

Description : Which of the following metals is not subjected to electrolytic refining/purification? (A) Copper (B) Zinc (C) Tin (D) Aluminium

Last Answer : (C) Tin

The arcing contacts in a circuit breaker are made of (a) copper tungsten alloy (b) porcelain (c) electrolytic copper (d) aluminium alloy

Description : The arcing contacts in a circuit breaker are made of (a) copper tungsten alloy (b) porcelain (c) electrolytic copper (d) aluminium alloy

Last Answer : (a) copper tungsten alloy

Describe construction of Aluminium Electrolytic capacitor.

Description : Describe construction of Aluminium Electrolytic capacitor.

Last Answer : A plain foil dry electrolytic capacitor is made by forming a coating of aluminium oxide on both sides of an aluminium foil. Two strips of aluminium foil used are then separated by two layers of porous ... is rolled up the ends closed with wax and then sealed into an aluminium container.

State the functions of following essential parts of electrolytic capacitor. 1. Aluminium foil 2. Oxide film 3. Spacers 4. Aluminium container

Description : State the functions of following essential parts of electrolytic capacitor. 1. Aluminium foil 2. Oxide film 3. Spacers 4. Aluminium container

Last Answer : 1. Aluminium Foil – It serves as a positive electrode called anode  2. Oxide film – It acts as a dielectric medium.  3. Spacer- It is used to provide separation and hold the electrolyte.  4. Aluminium container- It serves as a negative electrode called cathode.

Explain electrolytic refining of aluminium with neat labelled diagram

Description : Explain electrolytic refining of aluminium with neat labelled diagram 

Last Answer : Process: 1) The electrolytic cell consists of an iron tank lined at the bottom with carbon, which serve as anode. A number of graphite rods serve as cathode. 2) The cell is filled with three ... Crude or impure Al is added to the bottom layer from time to time. The process is thus continued.

Describe the process of purification of aluminium by electrolytic refining with the help of neat, labelled diagram.

Description : Describe the process of purification of aluminium by electrolytic refining with the help of neat, labelled diagram.

Last Answer : Process: 1) The electrolytic cell consists of an iron tank lined at the bottom with carbon, which serve as anode. A number of graphite rods serve as cathode. 2) The cell is filled with ... . Crude or impure Al is added to the bottom layer from time to time. The process is thus continued.

(A) Reduction of `Cr_(2)O)(3)` with the Aluminium is possible ( R ) `DeltaG_((f))^(0) of Cr_(3)O_(3) " is -540kj//mole and" DeltaG_((f))^(0) ` `of Al_

Description : (A) Reduction of `Cr_(2)O)(3)` with the Aluminium is possible ( R ) `DeltaG_((f))^(0) of Cr_(3)O_(3) " is -540kj//mole and" DeltaG_((f))^(0) ` `of Al_

Last Answer : (A) Reduction of `Cr_(2)O)(3)` with the Aluminium is possible ( R ) `DeltaG_((f))^(0) of Cr_ ... incorrect D. If (A) is incorrect but (R ) is correct

The function of fluorspar in the electrolytic reduction of alumnia dissolved in fused cryotile `(Na_(3)AlF_(6))` is:

Description : The function of fluorspar in the electrolytic reduction of alumnia dissolved in fused cryotile `(Na_(3)AlF_(6))` is:

Last Answer : The function of fluorspar in the electrolytic reduction of alumnia dissolved in fused cryotile `(Na_(3 ... rate of oxidation of carbon at the cathode

Where does reduction occur in an electrolytic cell?

Description : Where does reduction occur in an electrolytic cell?

Last Answer : Cathode

Chlorine gas is produced by the electrolysis of brine (NaCl solution with solid NaCl make up) in mercury electrolytic cell. Which of the following is the anodic reaction? (A) Oxidation of Na + ions (B) Oxidation of Cl - ions (C) Reduction of Na + ions (D) Reduction of Cl - ions

Description : Chlorine gas is produced by the electrolysis of brine (NaCl solution with solid NaCl make up) in mercury electrolytic cell. Which of the following is the anodic reaction? (A) Oxidation of Na + ions (B) Oxidation of Cl - ions (C) Reduction of Na + ions (D) Reduction of Cl - ions

Last Answer : (B) Oxidation of Cl - ions

Titanium is produced by __________ of Ti Cl4. (A) Electrolytic reduction (B) Calcium reduction (C) Magnesium reduction (D) Thermal dissociation

Description : Titanium is produced by __________ of Ti Cl4. (A) Electrolytic reduction (B) Calcium reduction (C) Magnesium reduction (D) Thermal dissociation

Last Answer : (C) Magnesium reduction

Titanium is produced by __________ of Ti Cl4. (A) Electrolytic reduction (B) Calcium reduction (C) Magnesium reduction (D) Thermal dissociation

Description : Titanium is produced by __________ of Ti Cl4. (A) Electrolytic reduction (B) Calcium reduction (C) Magnesium reduction (D) Thermal dissociation

Last Answer : (C) Magnesium reduction

Catalyst used in catalytic reforming is (A) Platinum on alumina (B) Nickel (C) Iron (D) Aluminium chloride

Description : Catalyst used in catalytic reforming is (A) Platinum on alumina (B) Nickel (C) Iron (D) Aluminium chloride

Last Answer : (A) Platinum on alumina

Catalyst used in the isomerisation is (A) Aluminium chloride (B) Alumina (C) Nickel (D) Phosphoric acid

Description : Catalyst used in the isomerisation is (A) Aluminium chloride (B) Alumina (C) Nickel (D) Phosphoric acid

Last Answer : (A) Aluminium chloride

Briefly explain the extraction of aluminium from alumina with chemical equations.

Description : Briefly explain the extraction of aluminium from alumina with chemical equations.

Last Answer : Aluminium oxide dissolved in molten cryolite is taken in a chamber with gently sloped base.The inner wall is made of carbon lining. Graphite rods are introduced in the electrolyte bath. The carbon lining ... is passed. Molten aluminium collects at the lining and flows out of the gently sloped base.

What is the difficulty in obtaining aluminium from alumina?

Description : What is the difficulty in obtaining aluminium from alumina?

Last Answer : Pure alumina melts at 2323K. At this temperature, aluminium vapourises and there will be considerable loss. It consumes more energy and also molten aluminium is not a very good conductor of electricity.

Why is pure alumina needed for the extraction of aluminium?

Description : Why is pure alumina needed for the extraction of aluminium?

Last Answer : For electrolysis of we need pure alumina. Hence bauxite is converted into alumina by chemical process.

The catalyst used in the manufacture of DDT is (A) Alumina (B) Silica (C) 20% oleum (D) Aluminium chloride

Description : The catalyst used in the manufacture of DDT is (A) Alumina (B) Silica (C) 20% oleum (D) Aluminium chloride

Last Answer : (C) 20% oleum

For extraction of sodium from `NaC1`, the electrolytic mixture `Nac1+Na_(3)A1F_(6) +Cac1_(2)` is used. During extractions process, only sodium is depo

Description : For extraction of sodium from `NaC1`, the electrolytic mixture `Nac1+Na_(3)A1F_(6) +Cac1_(2)` is used. During extractions process, only sodium is depo

Last Answer : For extraction of sodium from `NaC1`, the electrolytic mixture `Nac1+Na_(3)A1F_(6) +Cac1_(2)` is used. During ... that of `K^(+)` and `Ca^(+2)` ions

Scale formation in boiler is controlled by (A) Preheating of feed water (B) Reduction in hardness, silica & alumina in feed water (C) Keeping the pH value of feed water just below 7 (D) Eliminating H2S in feed water

Description : Scale formation in boiler is controlled by (A) Preheating of feed water (B) Reduction in hardness, silica & alumina in feed water (C) Keeping the pH value of feed water just below 7 (D) Eliminating H2S in feed water

Last Answer : (B) Reduction in hardness, silica & alumina in feed water

The catalyst used in the production of elemental sulphur from H2S (by oxidation-reduction) is (A) Alumina (B) Silica gel(C) Platinum(D) Nickel

Description : The catalyst used in the production of elemental sulphur from H2S (by oxidation-reduction) is (A) Alumina (B) Silica gel (C) Platinum (D) Nickel

Last Answer : (A) Alumina

Is vanilla extract a compound element or a mixture?

Description : Is vanilla extract a compound element or a mixture?

Last Answer : compound...........