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

Electrolytic reducation of `Al_(2)O_(3)` Electrolyte `(Al_(2)O_(3)+cryolite) ` Cathode : fraphite inside Fe -Container The purpose of adding cryolite
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Electrolytic reducation of `Al_(2)O_(3)` Electrolyte `(Al_(2)O_(3)+cryolite) ` Cathode : fraphite inside ... the impurities as slag D. Both (a) & (B)
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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

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

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

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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)

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

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

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(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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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

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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_(

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How many of the following liberate `O_(2)` on heating in a dry test tube ? `CaO, Fe_(2)O_(3), Fe_(3)O_(4), FeO, Cr_(2)O_(3), XeF_(4), Al_(2)O_(3), MgO

Description : How many of the following liberate `O_(2)` on heating in a dry test tube ? `CaO, Fe_(2)O_(3), Fe_(3)O_(4), FeO, Cr_(2)O_(3), XeF_(4), Al_(2)O_(3), MgO

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P is an alcohl which on heating with `Al_(2)O_(3)` forms an alkene Q.Q on ozonolysis produces R and S. When the mixture of R and S is heated with NaOH

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P is an alcohl which on heating with `Al_(2)O_(3)` forms an alkene Q.Q on ozonolysis produces R and S. When the mixture of R and S is heated with NaOH

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Last Answer : P is an alcohl which on heating with `Al_(2)O_(3)` forms an alkene Q.Q on ozonolysis produces R and S. ... (|)overset(CH_(3))overset(|)(C)-CH=CH_(2)`

P is an alcohl which on heating with `Al_(2)O_(3)` forms an alkene Q.Q on ozonolysis produces R and S. When the mixture of R and S is heated with NaOH

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Statement -1 `Al_(2)O_(3)` is converted in to Al by reductin with carbon at high temp.statement -2: Carbon has grater affinity for oxygen than alumium

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The most abundant ore of Al, called bauxite ore has the cheimal compositon `Al_(2)O_(3). xH_(2)O`. The x is

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Which of the following statement is incorrect ? a)Oxide of aluminium `(Al_(2)O_(3))` and arsenic `(As_(2)O_(3))` are amphoteric. b)Oxide of chlorine `

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Bauxide ore is made up of `Al_(2)O_(3) + SiO_(2) + TiO_(2) + Fe_(2) O_(3)`. This ore is treated with conc. `NaOH` solution at `500 K` and `35` bar pre

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Last Answer : Bauxide ore is made up of `Al_(2)O_(3) + SiO_(2) + TiO_(2) + Fe_(2) O_(3)`. This ore is treated with ... `Na_(2)SiO_(3)` both D. `Na_(2)SiO_(3)` Only

In the extraction of aluminium by Hall-Heroult process purified `Al_(2)O_(3)` is mixed with `CaF_(2)` to

Description : In the extraction of aluminium by Hall-Heroult process purified `Al_(2)O_(3)` is mixed with `CaF_(2)` to

Last Answer : In the extraction of aluminium by Hall-Heroult process purified `Al_(2)O_(3)` is mixed with `CaF_(2)` to A ... ^(3+)` into Al(s)` D. acts as catalyst

(A) The reduction reaction, `Cr_(2)O_(3)+2Al to Al_(2)O_(3)+2Cr, DeltaG^(0)=-421KJ` is not possible at room temperature (R ) Certain amount of activat

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Last Answer : (A) The reduction reaction, `Cr_(2)O_(3)+2Al to Al_(2)O_(3)+2Cr, DeltaG^(0)=-421KJ` is not ... incorrect D. If (A) is incorrect but (R ) is correct

(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_

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Match the following `{:("List I","ListII"),("(A) Feldspar",(I) [Ag_(3)SbS_(3)]),("(B) Asbestors",(II) Al_(2)O_(3)H_(2)O),("(C) Pyrargyrite",(III) MgSO

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Last Answer : Match the following `{:("List I","ListII"),("(A) Feldspar",(I) [Ag_(3)SbS_(3)]),("(B) Asbestors",(II) Al_(2)O_( ... (,(A),(B),(C),(D)),(,II,V,IV,I):}`

Aluminium is obtained by the electrolysis of pure of `Al_(2)O_(3)` dissolved in

Description : Aluminium is obtained by the electrolysis of pure of `Al_(2)O_(3)` dissolved in

Last Answer : Aluminium is obtained by the electrolysis of pure of `Al_(2)O_(3)` dissolved in A. Alumina B. Bauxite C. Cryolite D. Felspar

The value of n in the molecular formula `Be_(n)Al_(2)Si_(6)O_(18)` is:

Description : The value of n in the molecular formula `Be_(n)Al_(2)Si_(6)O_(18)` is:

Last Answer : The value of n in the molecular formula `Be_(n)Al_(2)Si_(6)O_(18)` is:

`BeO,Al_(2)O_(3),SnO_(2),SiO_(2),Sb_(2)O_(3),PbO` are __ oxides

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

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What products do we get on electrolysis of saturated brine using steel cathode and graphite anode in an electrolytic cell? (A) Cl2 & Na (B) Cl2 & H2 (C) O2 & H2 (D) Cl2 , H2 & NaOH solution

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Last Answer : (D) Cl2 , H2 & NaOH solution

Pick out the wrong statement about coating/electroplating of metals. (A) Phosphate coating is used as an excellent base for paints & enamels (B) Phosphate coating is less corrosion resistant than chromate coating (C) The base metal to be electroplated is normally made the cathode of the electrolytic cell and coating metal is made the anode (D) Calorising is the process of coating steel with chromium

Description : Pick out the wrong statement about coating/electroplating of metals. (A) Phosphate coating is used as an excellent base for paints & enamels (B) Phosphate coating is less corrosion resistant than ... coating metal is made the anode (D) Calorising is the process of coating steel with chromium

Last Answer : (D) Calorising is the process of coating steel with chromium

Statement - 1 : `PbSiF_(6) + H_(2) SiF_(6)` + gelatine is taken as electrolyte in electrolytic refining of lead . Statement -2 : Discharge potential o

Description : Statement - 1 : `PbSiF_(6) + H_(2) SiF_(6)` + gelatine is taken as electrolyte in electrolytic refining of lead . Statement -2 : Discharge potential o

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Define the following : Electrochemistry , Electrolyte , Non-Electrolyte , Electrolytic Cell , Galvanic or Voltaic cell , Electrolysis , Hydrolysis & electroplating.

Description : Define the following : Electrochemistry , Electrolyte , Non-Electrolyte , Electrolytic Cell , Galvanic or Voltaic cell , Electrolysis , Hydrolysis & electroplating.

Last Answer : Ans : (a) Electrochemistry : Electrochemistry is the branch of chemistry which deals with such chemical reactions involving the inter-conversion of electrical energy and chemical energy. Example : Batteries , ... should be a solution of the coating metal, such as its metal nitrate or sulfate.

In electro-refining, the pure metal is deposited on – (1) vessel (2) electrolyte (3) cathode (4) anode

Description : In electro-refining, the pure metal is deposited on – (1) vessel (2) electrolyte (3) cathode (4) anode

Last Answer : (3) cathode Explanation: In electro-refining, the anodes consist of unrefined impure metal, and as the current passes through the acidic electrolyte the anodes are corroded into the solution so ... pure metal onto the cathodes. Electrolytic refining is used to extract impurities from crude metals.

In electro-refining, the pure metal is deposited on (1) vessel (2) electrolyte (3) cathode (4) anode

Description : In electro-refining, the pure metal is deposited on (1) vessel (2) electrolyte (3) cathode (4) anode

Last Answer : cathode

Which of the following is an electrolytic cell A. lron * (ll) * (Fe) oxidized, aluminum (Al) reduced O B. Silver (Ag) oxidized, gold (Au) reduced C. Aluminum () oxidized (Zn) reduced LithiumD. (Li) oxidized, (Zn) reduced?

Description : Which of the following is an electrolytic cell A. lron * (ll) * (Fe) oxidized, aluminum (Al) reduced O B. Silver (Ag) oxidized, gold (Au) reduced C. Aluminum () oxidized (Zn) reduced LithiumD. (Li) oxidized, (Zn) reduced?

Last Answer : The answer is not c.

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.

For the just coagultion of 250 mL of `Fe(OH)_(3)` sol, 2 mL of `1 M Na_(2)SO_(4)` electrolyte is required. What is the coagulating value of `Na_(2)SO_

Description : For the just coagultion of 250 mL of `Fe(OH)_(3)` sol, 2 mL of `1 M Na_(2)SO_(4)` electrolyte is required. What is the coagulating value of `Na_(2)SO_

Last Answer : For the just coagultion of 250 mL of `Fe(OH)_(3)` sol, 2 mL of `1 M Na_(2)SO_(4)` ... What is the coagulating value of `Na_(2)SO_(4)` electrolyte.

In the illustration, the component labeled 'G' _________. EL-0031 A. is lined with cardboard to maintain a moisture (electrolyte) barrier between cells B. is a one piece container with compartments for each individual cell C. must be UL approved for shipboard use D. can only contain one cell

Description : In the illustration, the component labeled 'G' _________. EL-0031 A. is lined with cardboard to maintain a moisture (electrolyte) barrier between cells B. is a one piece container with compartments for each individual cell C. must be UL approved for shipboard use D. can only contain one cell

Last Answer : Answer: B

When mixing electrolyte for a lead-acid storage battery, ______________. A. stirring should always be avoided B. a lead container should always be used C. always pour the water into the acid D. always pour the acid into the water

Description : When mixing electrolyte for a lead-acid storage battery, ______________. A. stirring should always be avoided B. a lead container should always be used C. always pour the water into the acid D. always pour the acid into the water

Last Answer : Answer: D

When mixing electrolyte for a lead-acid storage battery, you should pour the ___________. A. distilled water into the acid in a zinc-plated container B. distilled water into the acid in a glass container C. acid into the distilled water in a zinc-plated container D. acid into distilled water in a glass container

Description : When mixing electrolyte for a lead-acid storage battery, you should pour the ___________. A. distilled water into the acid in a zinc-plated container B. distilled water into the acid in a glass ... into the distilled water in a zinc-plated container D. acid into distilled water in a glass container

Last Answer : Answer: D

On adding excess electrolyte what happens to the collides :-

Description : On adding excess electrolyte what happens to the collides :-

Last Answer : On adding excess electrolyte what happens to the collides :- A. Coagulates B. Dissolves C. Peptizes D. Disperses

When the electrolyte level of a lead-acid storage battery has decreased due to normal evaporation, the level should be reestablished by adding _____________. A. distilled water only B. sulfuric acid only C. a weak solution of sulfuric acid and distilled water D. a strong solution of sulfuric acid and distilled water

Description : When the electrolyte level of a lead-acid storage battery has decreased due to normal evaporation, the level should be reestablished by adding _____________. A. distilled water only B. sulfuric acid ... of sulfuric acid and distilled water D. a strong solution of sulfuric acid and distilled water

Last Answer : Answer: A

The charge of a lead-acid battery can be restored by ______. A. passing an alternating electric current through the cell B. passing a direct electric current through the cell C. adding acid to the electrolyte D. all of the above

Description : The charge of a lead-acid battery can be restored by ______. A. passing an alternating electric current through the cell B. passing a direct electric current through the cell C. adding acid to the electrolyte D. all of the above

Last Answer : Answer: B

Local action in a nickel-cadmium battery is offset by _____________. A. separating the positive and negative plates with plastic spacers B. separating the positive and negative plates with resin impregnated spacers C. adding a small amount of lithium hydroxide to the electrolyte D. trickle charging

Description : Local action in a nickel-cadmium battery is offset by _____________. A. separating the positive and negative plates with plastic spacers B. separating the positive and negative plates with resin impregnated spacers C. adding a small amount of lithium hydroxide to the electrolyte D. trickle charging

Last Answer : Answer: D

Radioactive materials should be kept in the container made of : (1) Fe (2) Al (3) Pb (4) Steel

Description : Radioactive materials should be kept in the container made of : (1) Fe (2) Al (3) Pb (4) Steel

Last Answer : (4) Steel Explanation: Radioactive materials are first encased in resin or concrete and sealed in steel drums. The drums are then packed into concrete casks and placed in concrete trenches up to 18 metres deep.

Radioactive materials should be kept in the container made of : (1) Fe (2) Al (3) Pb (4) Steel

Description : Radioactive materials should be kept in the container made of : (1) Fe (2) Al (3) Pb (4) Steel

Last Answer : Steel

When `S_(2)O_(8)^(2-)` oxidise `Fe^(2+)` then product formed is :-

Description : When `S_(2)O_(8)^(2-)` oxidise `Fe^(2+)` then product formed is :-

Last Answer : When `S_(2)O_(8)^(2-)` oxidise `Fe^(2+)` then product formed is :- A. `s_(2)O_(6)^(2-)` B. `SO_(4)^(2-)` C. `S_(2)O_(8)^(2-)` D. `SO_(5)^(2-)`

What would be the equivalent weight of the reductant in the reaction : `[Fe(CN)_(6)]^(-3)+H_(2)O_(2)+2OH^(-)rarr2[Fe(CN)_(6)]^(4-)+2H_(2)O+O_(2)` [Giv

Description : What would be the equivalent weight of the reductant in the reaction : `[Fe(CN)_(6)]^(-3)+H_(2)O_(2)+2OH^(-)rarr2[Fe(CN)_(6)]^(4-)+2H_(2)O+O_(2)` [Giv

Last Answer : What would be the equivalent weight of the reductant in the reaction : `[Fe(CN)_(6)]^(-3)+H_(2)O_(2)+2OH^(-) ... O=16,H=1]` A. 17 B. 212 C. 34 D. 32