Metallurgical Operations Test 2

Total Questions:50 Total Time: 75 Min

Remaining:

 

Questions 1 of 50

Question:The highest quantity present in the atmosphere is of

Answers Choices:

Oxygen

Hydrogen

Nitrogen

Ozone

Questions 2 of 50

Question:Which of the following statement is correct

Answers Choices:

Bauxite is an ore of aluminium

Magnetite is an ore of manganese

Haematite is an ore of mercury

Pyrites is an ore of phosphorus

Questions 3 of 50

Question:Carnellite is a mineral of

Answers Choices:

\(Ca\)

\(Na\)

\(Mg\)

\(Zn\)

Questions 4 of 50

Question:The salt which is least likely to be found in minerals is

Answers Choices:

Chloride

Sulphate

Sulphide

Nitrate

Questions 5 of 50

Question:Cryolite is

Answers Choices:

Magnesium silicate

Sodium borofluoride

Sodium aluminium fluoride

Magnesium silicate

Questions 6 of 50

Question:Composition of bauxite is

Answers Choices:

\(A{l_2}{O_3}\)

\(A{l_2}{O_3}.\,{H_2}O\)

\(A{l_2}{O_3}.\,2{H_2}O\)

\(A{l_2}{O_3}.\,3{H_2}O\)

Questions 7 of 50

Question:Main ore of aluminium is

Answers Choices:

Bauxite

Corundum

Cryolite

Magnetite

Questions 8 of 50

Question:Corundum is

Answers Choices:

\(Sr{O_2}\)

\(A{l_2}{O_3}\)

\(CaC{l_2}\)

\(C{u_2}C{l_2}\)

Questions 9 of 50

Question:Argentite is a mineral of

Answers Choices:

Copper

Silver

Platinum

Gold

Questions 10 of 50

Question:Which one of the following is an ore of silver

Answers Choices:

Argentite

Stibnite

Haematite

Bauxite

Questions 11 of 50

Question:Calamine is

Answers Choices:

\(ZnS{O_4}\)

\(ZnO\)

\(Zn{(N{O_3})_2}\)

\(ZnC{O_3}\)

Questions 12 of 50

Question:Important ore of zinc is

Answers Choices:

Calamine

Cryolite

Gibsite

Malachite

Questions 13 of 50

Question:The molecular formula of cryolite is

Answers Choices:

\(F{e_3}{O_4}\)

\(N{a_3}Al{F_6}\)

\(Na{ & _2}A{l_2}{O_3}\)

All of these

Questions 14 of 50

Question:All ores are minerals, while all minerals are not ores because

Answers Choices:

The metal can’t be extracted economically from all the minerals

Minerals are complex compounds

The minerals are obtained from mines

All of these are correct

Questions 15 of 50

Question:Corundum is an ore of

Answers Choices:

Copper

Boron

Aluminium

Sodium

Questions 16 of 50

Question:Which one of the following is correct

Answers Choices:

A mineral cannot be an ore

An ore cannot be a mineral

All minerals are ores

All ores are minerals

Questions 17 of 50

Question:Which of the following is a carbonate ore

Answers Choices:

Pyrolusite

Malachite

Diaspore

Cassiterite

Questions 18 of 50

Question:Sulphide ores are generally concentrated by

Answers Choices:

Froth floatation process

Magnetic separation

Gravity separation

By hand picking

Questions 19 of 50

Question:Froth floatation process is used for the concentration of

Answers Choices:

Oxide ores

Sulphide ores

Chloride ores

Amalgams

Questions 20 of 50

Question:Magnetic separation is used for increasing concentration of the following

Answers Choices:

Horn silver

Calcite

Haematite

Magnesite

Questions 21 of 50

Question:In the metallurgy of zinc, flux is not used because

Answers Choices:

Zinc ore has no impurities

Zinc is volatile hence easily separated

Zinc reacts with flux

Flux is volatile

Questions 22 of 50

Question:Ores like magnetite or tungstates in tin ores are concentrated by

Answers Choices:

Froth floatation

Magnetic separation

Gravity separation

Electrostatic separation

Questions 23 of 50

Question:Froth–floatation method is successful in separating impurities from ores because

Answers Choices:

The pure ore is lighter than water containing additives like pine oil, cresylic acid etc.

The pure ore is soluble in water containing additives like pine oil, cresylic acid etc.

The impurities are soluble in water containing additives like pine oil, cresylic acid etc.

The pure ore is not as easily wetted by water as by pine oil, cresylic acid etc

Questions 24 of 50

Question:An ore like zinc blende is concentrated by

Answers Choices:

Froth floatation

Magnetic separation

Leaching

Washing with water

Questions 25 of 50

Question:In order to bring initial chemical change in the ore, the process of heating of ore below its melting point is known as

Answers Choices:

Reduction

Smelting

Calcination

Roasting

Questions 26 of 50

Question:Matte contains mainly

Answers Choices:

\(C{u_2}S\)and \(FeS\)

\(CuS\)and \(F{e_2}{S_3}\)

\(Fe\)

\(C{u_2}S\)

Questions 27 of 50

Question:The substance which is mixed with the ore for removal of impurities is termed as

Answers Choices:

Slag

Gangue

Flux

Catalyst

Questions 28 of 50

Question:The cheap and having high melting point compound used in furnace is

Answers Choices:

\(PbO\)

\(CaO\)

\(HgO\)

\(ZnO\)

Questions 29 of 50

Question:The smelting of iron in the blast furnace involves all the following process except

Answers Choices:

Oxidation

Reduction

Decomposition

Sublimation

Questions 30 of 50

Question:In the manufacture of iron from haematite, the function of lime stone is as

Answers Choices:

A reducing agent

Flux

Slag

Gangue

Questions 31 of 50

Question:The slag obtained during the extraction of copper from copper pyrites is composed mainly of

Answers Choices:

\(CaSi{O_3}\)

\(FeSi{O_3}\)

\(CuSi{O_3}\)

\(Si{O_2}\)

Questions 32 of 50

Question:Complex is formed in the extraction of

Answers Choices:

\(Na\)

\(Cu\)

\(Ag\)

\(Fe\)

Questions 33 of 50

Question:In blast furnace, the highest temperature is in

Answers Choices:

Reduction zone

Slag zone

Fusion zone

Combustion zone

Questions 34 of 50

Question:The process of roasting of an ore is carried out in the

Answers Choices:

Absence of air

Presence of air

Limited supply of air

None of these

Questions 35 of 50

Question:Flux is used to remove

Answers Choices:

Acidic impurities

Basic impurities

All impurities from ores

Both 1 and 2

Questions 36 of 50

Question:During extraction of \(Fe\); slag obtained is

Answers Choices:

\(FeO\)

\(FeSi{O_3}\)

\(MgSi{O_3}\)

\(CaSi{O_3}\)

Questions 37 of 50

Question:The important step in the extraction of metal from carbonate ore is

Answers Choices:

Calcination

Roasting

Electro–reduction

Cupellation

Questions 38 of 50

Question:Electrometallurgical process is used to extract

Answers Choices:

\(Fe\)

\(Pb\)

\(Na\)

\(Ag\)

Questions 39 of 50

Question:General method for the extraction of metal from oxide ore is

Answers Choices:

Carbon reduction

Reduction by aluminium

Reduction by hydrogen

Electrolytic reduction

Questions 40 of 50

Question:Alumina

Answers Choices:

Is a good conductor of electricity

Is a bad conductor of electricity

Melts at \({200^o}C\)

Is an electrovalent compound

Questions 41 of 50

Question:Aluminium is prepared in large quantities by

Answers Choices:

Heating cryolite in a limited quantity of air

Reducing aluminium oxide with coke

Reducing aluminium oxide with sodium

Electrolysing aluminium oxide dissolved in fused electrolyte

Questions 42 of 50

Question:Alumina is

Answers Choices:

\(Al{(OH)_3}\)

\(AlC{l_3}\)

\(AIN\)

\(A{l_2}{O_3}\)

Questions 43 of 50

Question:Alumino–thermic process is used for metallurgy of

Answers Choices:

\(Pb\)

\(Ag\)

\(Al\)

None of these

Questions 44 of 50

Question:Which metal can't be obtained from electrolysis

Answers Choices:

\(Cu\)

\(Mg\)

\(Cr\)

\(Ni\)

Questions 45 of 50

Question:To obtain chromium from chromic oxide \((C{r_2}{O_3}),\) the method used is

Answers Choices:

Alumino-thermic process

Electrolytic reduction

Carbon reduction

Carbon monoxide reduction

Questions 46 of 50

Question:The substance used in the thermite process of reducing metal ores is

Answers Choices:

Aluminium

Thorium

Heated platinum gauze

Carbon

Questions 47 of 50

Question:Silver obtained from argentiferrous lead containing lead impurity is purified by

Answers Choices:

Distillation

Froth floatation

Cupellation

Treatment of \(KCN\)

Questions 48 of 50

Question:If the impurity in a metal has a greater affinity for oxygen and is more easily oxidised than the metal, then the purification of metal may be carried out by

Answers Choices:

Poling

Zone refining

Electrolytic refining

Cupellation

Questions 49 of 50

Question:Electric refining is used for refining of

Answers Choices:

Lead

Copper

Iron

Sodium

Questions 50 of 50

Question:Zone refining is used for the purification of

Answers Choices:

\(Cu\)

\(Au\)

\(Ge\)

\(Ag\)