454 + Interview Questions in METALLURGY IN GENERAL AWARENESS Page 7 InterviewSolution

301.	Write scientific reason.Pine oil is used in the froth floatation process.
Answer» In the concentration of an ore by froth floatation process, the ore is mixed with water and pine oil. When air is bubbled through the mixture a froth is formed. The mineral particles in the ore are preferentially wetted by the oil and float on the top in the froth. The gangue particles are wetted by water and settle down. Thus the mineral can be separated from the gangue and the ore is concentrated.

Discussion

302.	Write scientific reason.Anodes need to be replaced from time to time during the electrolysis of alumina.
Answer» During electrolysis of alumina, the oxygen liberated at the carbon anode reacts with graphite rods (carbon anode) and forms carbon dioxide. As the anodes get oxidised during electrolysis of alumina, they are continuously eroded. Hence, it is necessary to replace anodes from time to time.

Discussion

303.	When a copper coin is dipped in silver nitrate solution, a glitter appears on the coin after some time. Why does this happen? Write the chemical equation.
Answer» When a copper coin is dipped in a silver nitrate solution, more reactive copper displaces silver from silver nitrate solution. The silver so liberated deposits on the copper coin. As a result, a shiny coat of silver is formed on the coin. Cu_(s) + 2AgNO_3(aq) → Cu(NO₃)_2(aq) + 2Ag_(s)

303.

When a copper coin is dipped in silver nitrate solution, a glitter appears on the coin after some time. Why does this happen? Write the chemical equation.

Answer»

When a copper coin is dipped in a silver nitrate solution, more reactive copper displaces silver from silver nitrate solution. The silver so liberated deposits on the copper coin. As a result, a shiny coat of silver is formed on the coin.

Cu_(s) + 2AgNO_3(aq) → Cu(NO₃)_2(aq) + 2Ag_(s)

Discussion

304.	Extraction of aluminium can be understood by : Electrolytric reduction of `Al_(2) O_(3)` : Electrolysis : `Al_(2) O_(3) + Cryolite + CaF_(2)` Cathode : Carbon inside the `Fe` container Anode : Graphite rods. The purpose of adding cryolite is.A. to decrease the electrical conductivity of pure aluminiumB. to lower the melting point of `AI_(2)O_(3)`C. to remove the impurities as slagD. to increase the `Al%` in the yield
Answer» Correct Answer - B

Discussion

305.	Extraction of aluminium can be understood by : Electrolytric reduction of `Al_(2) O_(3)` : Electrolysis : `Al_(2) O_(3) + Cryolite + CaF_(2)` Cathode : Carbon inside the `Fe` container Anode : Graphite rods. The motion electrolytes contain `Na^(oplus),Al^(3+)` and `Ca^(2+)` but only `Al` gets deposited at cathode because,A. Standard reduction potential of `Al` is more than those of `Na & Ca`B. Standard oxidation potential of `Al` is more than those of `Na & Ca`C. Graphite reacts only with `Al^(3+)` and not with `Na^(+) & Ca^(2+)`D. Discharge potential of `Al^(3+)` is higher than `Na^(+) & Ca^(2+)`
Answer» Correct Answer - A

Discussion

306.	Extraction of aluminium can be understood by : Electrolytric reduction of `Al_(2) O_(3)` : Electrolysis : `Al_(2) O_(3) + Cryolite + CaF_(2)` Cathode : Carbon inside the `Fe` container Anode : Graphite rods. The function of fluorspar `(CaF_(2))` is.A. to increase the melting point of electrolyteB. to increase electrolytic conductivity powerC. to remove the impurities as slagD. all of the above
Answer» Correct Answer - B

Discussion

307.	(viii) Amongest the following groups of oxides, the group containing oxides that cannot be reducing by carbon to give the respective metals is.A. `Fe_(2)O_(3),ZnO`B. `PbO,Fe_(3)O_(4)`C. `Cu_(2)O,SnO_(2)`D. `CaO,K_(2)O`
Answer» (d) potassium and calcium are strong reductant hence their oxides cannot be reduced by carbon.

Discussion

308.	The reactivity of metals with dil HCl in decreasing order is ___________A. `Mg gt Zn gt Al gt Fe`B. ` Mg gt al gt Zn gt Fe`C. `Fe gt Zn gt Al gt Mg`D. `Fe gt Al gt Zn gt Mg`
Answer» `Mg gt al gt Zn gt Fe`

Discussion

309.	What is the nature of the oxides of metals ?
Answer» Oxides of metals are basic in nature.

Discussion

310.	In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.(a) A and R are correct, R explains A (b) A and R are correct, R does not explains A (c) A is correct but R is wrong (d) A is wrong but R is correctAssertion(A) – Clay is an ore of aluminium while bauxite is not. Reason (R) – Aluminium can be economically extracted from bauxite not from clay.
Answer» (d) A is wrong but R is correct

Discussion

311.	Find out the incorrect pair:(a) Copper – Least reactive (b) Clay – Mineral of Al (c) Bauxite – Mineral of Al (d) Gangue – Impurity
Answer» (c) Bauxite – Mineral of Al

Discussion

312.	Sequence the following steps involved generally in the extraction of a metal in pure form from its ore, the extraction of a metal in pure form from its ore. (1) The metal obtained from its oxide requires further purification for end use. (2) The ore shoud be converted to its oxide form. (3) The ore is beneficial to us if it is hand-picked then metal crushed and ground, and later subjected to Pulverisation as per the requirement. (4) The ore in the form of oxide is required to be reduced. (5) Dressed ore is required for it to be concentrated.A. 5 3 2 4 1B. 3 5 2 4 1C. 3 5 2 1 4D. 3 5 4 2 1
Answer» (i) The ore is beneficial to us if it is hand-picked and then ore is crushed and grounded, and later subjected to Pulverisation as per the requirement. (ii) Dressed ore is required to be concetrated. (iii) Ore is required to be converted to its oxide form. (iv) Ore in the form of oxide its oxide requires reduced. (v) The metal obtained from its oxide requires further purification for end use.

Discussion

313.	Bauxite has the composition ……………… (a) Al2O3(b) Al2O3 .nH3O (c) Fe2O3 .2H2O (d) None of these
Answer» (b) Al₂O₃ .nH₃O

Discussion

314.	Aluminium oxide is called an amphoteric oxide.
Answer» (i) An oxide which shows both acidic as well as basic properties is called and amphoteric oxide. (ii) Metal oxides are usually basic in nature. (iii) But some metal oxides like aluminium oxide, zinc oxide, etc, react both with acid as well as bases to produce salt and water. (iv) Aluminium oxide shows both acidic as well as basic peroperties. (v) Hence, aluminium oxide is called an amphoteric oxide

Discussion

315.	___________ is an oxide which is amphoteric.A. Cooper oxideB. Magneiusm dioxideC. Zinc oxideD. Calcium oxide
Answer» Correct Answer - Zinc oxide

Discussion

316.	State the chemical composition of Bauxite.
Answer» In Bauxite, Aluminium oxide `(Al_(2)O_(3). nH_(2)O)` is 30% to 70% while the reamaining portion is gangue made of silica, sand, iron oxide etc.

Discussion

317.	`NaCN` is sometimes added in the froth flotation process as a depressant when `ZnS` and `PbS` minerals are expected because `:`A. `Pb(CN)_(2)` is precipitated whhile no effect on `ZnS`.B. `ZnS` forms solubel complex `Na_(2)[Zn(CN)_(4)]` while `PbS` forms froth.C. `PbS` froms soluble complex `Na_(2)[Pb(CN)_(4)]` while `ZnS` forms froth.D. `NaCN` is never added in froth floatation process.
Answer» Correct Answer - 2 `ZnS+4NaCNrarrNa_(2)[Zn(CN)_(4)]+Na_(2)S` `PbS+NaCNrarr`No such complex formation

Discussion

318.	In the extraction of copper, metal is formed in the Bessemer converter due to reactionA. `Cu_(2)S +2Cu_(2)O rarr 6Cu +SO_(2)`B. `Cu_(2)S rarr 2Cu +S`C. `Fe + Cu_(2)O rarr 2Cu +FeO`D. `2Cu_(2)O rarr 4Cu +O_(2)`
Answer» Correct Answer - A

Discussion

319.	Select the stepe requried for the extraction of aluminium and sequence them. (1) froth flotation (2) chemical separation (3) electrolytic reduction (4) smelting (5) distillation under low pressure (6) electrolytic refining (7) Pulverisation (8) conversion of concentrated ore into oxide (9) crushing and grindingA. 9 5 7 2 3 8 6 1B. 3 2 1 4 5 6 7 8C. 9 7 2 8 3 6D. 9 7 2 3 8 6
Answer» (i) Crushing and grinding (ii) Pulverisation (iii) Chemical separation (iv) Conversion of concentrated ore into oxide (v) Electrolytic reduction (vi) Electrolytic refining

Discussion

320.	Why is it necessary to replace carbon anode from time to time in the electrolytic extraction of aluminium ?
Answer» (i) Reactions taking place at anode. (ii) Electrolyte used in the extraction of alumininum. (iii) Ions obtained. (iv) Products obtained at the anode. (v) Reaction between the product obtained and the anode.

Discussion

321.	The given sketch of an electrolytic cell used in the extraction of aluminium:(i) What is the substance of which the electrode A and B are made ? (ii) At which electrode (A ro B) is the aluminium formed ? (iii) What are the two aluminium compound in the electrolyte C ? (iv) Why is it necessary for electrode B to be continuously replaced ?
Answer» (i) Carbon (Graphite) (ii) A (iii) Aluminium oxide / Alumina / cryolite (sodium aluminium fluoride). (iv) Burns away in the presence of oxygen produced or consumed.

321.

The given sketch of an electrolytic cell used in the extraction of aluminium:(i) What is the substance of which the electrode A and B are made ? (ii) At which electrode (A ro B) is the aluminium formed ? (iii) What are the two aluminium compound in the electrolyte C ? (iv) Why is it necessary for electrode B to be continuously replaced ?

Answer»

(i) Carbon (Graphite)

(ii) A

(iii) Aluminium oxide / Alumina / cryolite (sodium aluminium fluoride).

(iv) Burns away in the presence of oxygen produced or consumed.

Discussion

322.	The given figure illustrates the refining of aluminium by Hoope’s process. (i) Which of A and B is the cathode and which one is the anode ? (ii) What is the electrolyte in the tank ? (iii) What material is used for the cathode ?
Answer» (i) A—Cathode, B—Anode. (ii) Mixture of fluorides. (iii) Graphite

322.

The given figure illustrates the refining of aluminium by Hoope’s process. (i) Which of A and B is the cathode and which one is the anode ? (ii) What is the electrolyte in the tank ? (iii) What material is used for the cathode ?

Answer»

(i) A—Cathode, B—Anode.

(ii) Mixture of fluorides.

(iii) Graphite

Discussion

323.	Write the reactions occuring at cathode and anode.
Answer» The electrons reaction are as follows : Anode reaction `-Ag to Ag^(+) +e^(-)` Cathode reaction `-Ag^(+)+w^(-) to Ag`

Discussion

324.	What can you say about the reactivity of metals at anode and cathode.
Answer» The reactivity of metal at anode is less thant the reactivitiy of metal at cathode.

Discussion

325.	Silver is purified by distillation process
Answer» Correct Answer - F

Discussion

326.	Impure nickel can be purified byA. electrolytic refiningB. Mond-carbonyl processC. zone-refining processD. van-arkel process
Answer» (b) Mond-carbony! Process is used to purify impure Ni.

Discussion

327.	The reagent that dissolves noble metals.
Answer» Correct Answer - Aqura regia

Discussion

328.	In _____________ process sulphide ores are strongly heated.
Answer» Correct Answer - Roasting

Discussion

329.	Explain the following reactions with the help of balanced equation:Chlorine is treated with hydrobromic acid.
Answer» When chlorine is treated with hydrobromic acid, chlorine displaces bromine from hydrobromic acid. Cl_2(g) + 2HBr_(aq) → 2HCl_(aq) + Br_2(aq)

329.

Explain the following reactions with the help of balanced equation:Chlorine is treated with hydrobromic acid.

Answer»

When chlorine is treated with hydrobromic acid, chlorine displaces bromine from hydrobromic acid.

Cl_2(g) + 2HBr_(aq) → 2HCl_(aq) + Br_2(aq)

Discussion

330.	Extraction of copper from its sulphide ore.
Answer» `{:(2Cu_(2)S,+,3O_(2),to, 2Cu_(2)O, +, 2SO_(2) uarr),("Copper",,"Oxygen",,"Copper",,"Sulphur"),("Sulphide",,,,"oxide",,"dioxide"),(2Cu_(2)O,+, Cu_(2)S, to, 6Cu,+,SO_(2) uarr),("Copper",, "Copper",,"Copper",,"Sulphur"),("oxide",,"sulphide",,,,"dioxide"):}`

Discussion

331.	Zinc oxide is dissolved in diute hydrochloric acid.
Answer» When zinc oxide dissolves in dilute hydrochoric acid, zinc chloride and water is formed. `underset("Oxide")underset("Zinc")(ZnO)+underset("Acid")underset("Hydrochloric")(2HCl)to underset("Chloride")underset("Zinc")(ZnCl_(2))+underset("Water")(H_(2)O)`

Discussion

332.	State two metals which can be cut easily with a knife.
Answer» Sodium and potassium are soft metals and can be cut easily with a knife.

Discussion

333.	The process employed for the purification of copper with cuprous oxide as the impurity isA. pollingB. liquationC. electrolytic processD. oxidation
Answer» Correct Answer - A

Discussion

334.	The reaction that is not asscoiated with the middle region of blast furnace during smelting is ______.A. `CO_(2)+Cto2CO`B. `CaCO_(3)toCaO+CO_(2)`C. `CaO+SiO_(2)toCaSiO_(3)`D. `C+O_(2)toCO_(2)`
Answer» `C+O_(2)toCO_(2)`. This reaction takes plance in the lower region of blast furnace.

Discussion

335.	Which of the following process involves smeltingA. `2PbS +3O_(2) rarr 2PbO + 2SO_(2) uarr`B. `AI_(2) O_(3).2H_(2)O rarr AI_(2)O_(3) + 2H_(2)O`C. `Fe_(2)O_(3) +CO rarr 2Fe +2CO_(2)`D. `Cr_(2)O_(3) + 2AI + AI_(2) O_(3) +2Cr +Heat`
Answer» Correct Answer - C

Discussion

336.	Fill in the blanks: 1. Magnesite is calcined to give …………… 2. …………… a chemical substance that forms an easily fusible slag with gangue. 3. Flux + Gangue → …………… 4. In the extraction of iron …………… is removed as slag. 5. In the extraction of copper …………… is removed as slag. 6. Cr O can be reduced by …………… an process. 7. …………… is used as a reducing agent for the reduction of chromic oxide. 8. …………… is purified by zone refining. 9. In the mond process, impure nickel is heated with …………… compound. 10. …………… filament is used to decompose.
Answer» 1. Magnesia 2. Flux 3. slag 4. Calcium silicate (CaSiO₃) 5. Ferrous silicate (FeSiO₃) 6. Aluminothermic process 7. Aluminium 8. semi-conductior 9. carbon monoxide 10. Tungsten

336.

Fill in the blanks: 1. Magnesite is calcined to give …………… 2. …………… a chemical substance that forms an easily fusible slag with gangue. 3. Flux + Gangue → …………… 4. In the extraction of iron …………… is removed as slag. 5. In the extraction of copper …………… is removed as slag. 6. Cr O can be reduced by …………… an process. 7. …………… is used as a reducing agent for the reduction of chromic oxide. 8. …………… is purified by zone refining. 9. In the mond process, impure nickel is heated with …………… compound. 10. …………… filament is used to decompose.

Answer»

1. Magnesia

2. Flux

3. slag

4. Calcium silicate (CaSiO₃)

5. Ferrous silicate (FeSiO₃)

6. Aluminothermic process

7. Aluminium

8. semi-conductior

9. carbon monoxide

10. Tungsten

Discussion

337.	Fill in the Blanks:1. …………… is the most abundant metal. 2. …………… is used in packing materials for food items.3. …………… is used in the manufacture of paints, rubber and cosmetics. 4. …………… is the first metal used by the humans. 5. …………… is one of the expensive and precious metals. 6. …………… is used for increasing the efficiency of solar cells and also used as catalysts. 7. …………… ore is concentrated by froth floatation process. 8. Zinc blende is concentrated by …………… process. 9. Gold ore is leached by adding of ……………
Answer» 1. Aluminium 2. Aluminium foils 3. Zinc oxide 4. Copper 5. Gold 6. Gold nanoparticle 7. Sulphide 8. Froth floatation 9. NaCN

337.

Fill in the Blanks:1. …………… is the most abundant metal. 2. …………… is used in packing materials for food items.3. …………… is used in the manufacture of paints, rubber and cosmetics. 4. …………… is the first metal used by the humans. 5. …………… is one of the expensive and precious metals. 6. …………… is used for increasing the efficiency of solar cells and also used as catalysts. 7. …………… ore is concentrated by froth floatation process. 8. Zinc blende is concentrated by …………… process. 9. Gold ore is leached by adding of ……………

Answer»

1. Aluminium

2. Aluminium foils

3. Zinc oxide

4. Copper

5. Gold

6. Gold nanoparticle

7. Sulphide

8. Froth floatation

9. NaCN

Discussion

338.	Match the following:(i) Haematite (a) Fe3O4(ii) Siderite(b) Fe3O3(iii) Iron pyrite(c) Fe3O3(iv) Magnetite(d) FeS2
Answer» (i) – (b) (ii) – (c) (iii) – (d) (iv) – (a)

338.

Match the following:(i) Haematite (a) Fe3O4(ii) Siderite(b) Fe3O3(iii) Iron pyrite(c) Fe3O3(iv) Magnetite(d) FeS2

Answer»

(i) – (b)

(ii) – (c)

(iii) – (d)

(iv) – (a)

Discussion

339.	Match the following:(i) Copper glance(a) CuCO3 . Cu(OH)2(ii) Malachite(b) Cu2S(iii) Copper pyrite(c) 2CuCO3. Cu(OH)2(iv) Azurite(d) CuFeS2
Answer» (i) – (b) (ii) – (a) (iii) – (d) (iv) – (c)

339.

Match the following:(i) Copper glance(a) CuCO3 . Cu(OH)2(ii) Malachite(b) Cu2S(iii) Copper pyrite(c) 2CuCO3. Cu(OH)2(iv) Azurite(d) CuFeS2

Answer»

(i) – (b)

(ii) – (a)

(iii) – (d)

(iv) – (c)

Discussion

340.	Match the following :(i) Copper glance(a) CuCO3 . Cu(OH)2(ii) Malachite(b) Cu2S(iii) Copper pyrite(c) 2CuCO3 . Cu(OH)2(iv) Azurite(d) CuFeS2
Answer» (i) – (b) (ii) – (a) (iii) – (d) (iv) – (c)

340.

Match the following :(i) Copper glance(a) CuCO3 . Cu(OH)2(ii) Malachite(b) Cu2S(iii) Copper pyrite(c) 2CuCO3 . Cu(OH)2(iv) Azurite(d) CuFeS2

Answer»

(i) – (b)

(ii) – (a)

(iii) – (d)

(iv) – (c)

Discussion

341.	Copper glance is...........type of ore-A. CarbonateB. SulphidesC. OxideD. Sulphate
Answer» Correct Answer - B Copper glance, chemical formula is `Cu_(2)S`.

Discussion

342.	What is meant by amalgam?
Answer» The amalgam is an alloy in which one of the metals is mercury.

Discussion

343.	High purity copper is obtained byA. Zone refiningB. PolingC. Electrolytic refiningD. Cupelling
Answer» Correct Answer - C After electrlytic refining. Purity of copper is `99.99%` which is enough for electrical applications.

Discussion

344.	State the term used to express the purity of gold.
Answer» The purity of gold is expressed in carat.

Discussion

345.	What are the constituents of bronze?
Answer» Copper and tin are the constituents of bronze.

Discussion

346.	Select the correct answer from A, B, C and D. The two main metals in Bronze are : (A) Copper and zinc (B) Copper and lead (C) Copper and nickel (D) Copper and tin
Answer» The two main metals in Bronze are Copper and tin.

Discussion

347.	ldentify the term in the following : “The method used to separate ore from gangue by preferential wetting.”
Answer» Froth flotation process.

Discussion

348.	A strip of copper is placed in four different colourless salt solutions. They are KNO3 , AgNO3 , Zn(NO3 )2 , Ca(NO3)2 . Which one of the solutions will finaky turn blue.
Answer» Silver Nitrate (AgNO₃).

Discussion

349.	Sulfide ores are common for the metals.A. `Ag,Cu` and `Pb`B. `Ag,Cu` and `Zn`C. `Ag,Mg` and `Pb`D. `Al,Cu` and `Pb`
Answer» Correct Answer - A

Discussion

350.	Statement I Nitrate ores are very rar. statement II Bond dissociation energy of `N_(2)` is very high Which of these statement (s) is`//`are true ?A. Only IB. Only IIC. Neither (a) nor (b)D. Both (a) and (b)
Answer» Correct Answer - (d)

Discussion

Explore topic-wise InterviewSolutions in .

Write scientific reason.Pine oil is used in the froth floatation process.

Write scientific reason.Anodes need to be replaced from time to time during the electrolysis of alumina.

When a copper coin is dipped in silver nitrate solution, a glitter appears on the coin after some time. Why does this happen? Write the chemical equation.

(viii) Amongest the following groups of oxides, the group containing oxides that cannot be reducing by carbon to give the respective metals is.A. `Fe_(2)O_(3),ZnO`B. `PbO,Fe_(3)O_(4)`C. `Cu_(2)O,SnO_(2)`D. `CaO,K_(2)O`

The reactivity of metals with dil HCl in decreasing order is ___________A. `Mg gt Zn gt Al gt Fe`B. ` Mg gt al gt Zn gt Fe`C. `Fe gt Zn gt Al gt Mg`D. `Fe gt Al gt Zn gt Mg`

What is the nature of the oxides of metals ?

Find out the incorrect pair:(a) Copper – Least reactive (b) Clay – Mineral of Al (c) Bauxite – Mineral of Al (d) Gangue – Impurity

Bauxite has the composition ……………… (a) Al2O3(b) Al2O3 .nH3O (c) Fe2O3 .2H2O (d) None of these

Aluminium oxide is called an amphoteric oxide.

___________ is an oxide which is amphoteric.A. Cooper oxideB. Magneiusm dioxideC. Zinc oxideD. Calcium oxide

State the chemical composition of Bauxite.

In the extraction of copper, metal is formed in the Bessemer converter due to reactionA. `Cu_(2)S +2Cu_(2)O rarr 6Cu +SO_(2)`B. `Cu_(2)S rarr 2Cu +S`C. `Fe + Cu_(2)O rarr 2Cu +FeO`D. `2Cu_(2)O rarr 4Cu +O_(2)`

Why is it necessary to replace carbon anode from time to time in the electrolytic extraction of aluminium ?

The given figure illustrates the refining of aluminium by Hoope’s process. (i) Which of A and B is the cathode and which one is the anode ? (ii) What is the electrolyte in the tank ? (iii) What material is used for the cathode ?

Write the reactions occuring at cathode and anode.

What can you say about the reactivity of metals at anode and cathode.

Silver is purified by distillation process

Impure nickel can be purified byA. electrolytic refiningB. Mond-carbonyl processC. zone-refining processD. van-arkel process

The reagent that dissolves noble metals.

In _____________ process sulphide ores are strongly heated.

Explain the following reactions with the help of balanced equation:Chlorine is treated with hydrobromic acid.

Extraction of copper from its sulphide ore.

Zinc oxide is dissolved in diute hydrochloric acid.

State two metals which can be cut easily with a knife.

The process employed for the purification of copper with cuprous oxide as the impurity isA. pollingB. liquationC. electrolytic processD. oxidation

The reaction that is not asscoiated with the middle region of blast furnace during smelting is ______.A. `CO_(2)+Cto2CO`B. `CaCO_(3)toCaO+CO_(2)`C. `CaO+SiO_(2)toCaSiO_(3)`D. `C+O_(2)toCO_(2)`

Which of the following process involves smeltingA. `2PbS +3O_(2) rarr 2PbO + 2SO_(2) uarr`B. `AI_(2) O_(3).2H_(2)O rarr AI_(2)O_(3) + 2H_(2)O`C. `Fe_(2)O_(3) +CO rarr 2Fe +2CO_(2)`D. `Cr_(2)O_(3) + 2AI + AI_(2) O_(3) +2Cr +Heat`

Match the following:(i) Haematite (a) Fe3O4(ii) Siderite(b) Fe3O3(iii) Iron pyrite(c) Fe3O3(iv) Magnetite(d) FeS2

Match the following:(i) Copper glance(a) CuCO3 . Cu(OH)2(ii) Malachite(b) Cu2S(iii) Copper pyrite(c) 2CuCO3. Cu(OH)2(iv) Azurite(d) CuFeS2

Match the following :(i) Copper glance(a) CuCO3 . Cu(OH)2(ii) Malachite(b) Cu2S(iii) Copper pyrite(c) 2CuCO3 . Cu(OH)2(iv) Azurite(d) CuFeS2

Copper glance is...........type of ore-A. CarbonateB. SulphidesC. OxideD. Sulphate

What is meant by amalgam?

High purity copper is obtained byA. Zone refiningB. PolingC. Electrolytic refiningD. Cupelling

State the term used to express the purity of gold.

What are the constituents of bronze?

Select the correct answer from A, B, C and D. The two main metals in Bronze are : (A) Copper and zinc (B) Copper and lead (C) Copper and nickel (D) Copper and tin

ldentify the term in the following : “The method used to separate ore from gangue by preferential wetting.”

A strip of copper is placed in four different colourless salt solutions. They are KNO3 , AgNO3 , Zn(NO3 )2 , Ca(NO3)2 . Which one of the solutions will finaky turn blue.

Sulfide ores are common for the metals.A. `Ag,Cu` and `Pb`B. `Ag,Cu` and `Zn`C. `Ag,Mg` and `Pb`D. `Al,Cu` and `Pb`

Statement I Nitrate ores are very rar. statement II Bond dissociation energy of `N_(2)` is very high Which of these statement (s) is`//`are true ?A. Only IB. Only IIC. Neither (a) nor (b)D. Both (a) and (b)