Metallurgy Practice Test — Class 12 Chemistry

12th Standard Chemistry — Metallurgy: Online Practice Test

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Bauxite has the composition

A.\(Al_{2}O_{3}\) B.\(Al_{2}O_{3}.nH_{2}O\) C.\(Fe_{2}O_{3}.2H_{2}O\) D.None of these

Roasting of sulphide ore gives the gas (A). (A) is a colourless gas. Aqueous solution of (A) is acidic. The gas (A) is

A.\(CO_{2}\) B.\(SO_{3}\) C.\(SO_{2}\) D.\(H_{2}S\)

Which one of the following reaction represents calcinations?

A.\(2Zn + O_{2} \rightarrow 2ZnO\) B.\(2ZnS + 3O_{2} \rightarrow 2ZnO + 2SO_{2}\) C.\(MgCO_{3} \rightarrow MgO + CO_{2}\) D.Both (a) and (c)

The metal oxide which cannot be reduced to metal by carbon is

A.PbO B.\(Al_{2}O_{3}\) C.ZnO D.FeO

Which of the metal is extracted by Hall-Heroult process?

A.Al B.Ni C.Cu D.Zn

Which of the following statements, about the advantage of roasting of sulphide ore before reduction is not true?

A.\(\Delta G_{f}^{0}\) of sulphide is greater than those for \(CS_{2}\) and \(H_{2}S\). B.\(\Delta G_{r}^{0}\) is negative for roasting of sulphide ore to oxide C.Roasting of the sulphide to its oxide is thermodynamically feasible. D.Carbon and hydrogen are suitable reducing agents for metal sulphides.

Match items in column - I with the items of column – II and assign the correct code. Column-I: A) Cyanide process B) Froth floatation process C) Electrolytic reduction D) Zone refining Column-II: (i) Ultrapure Ge (ii) Dressing of ZnS (iii) Extraction of Al (iv) Extraction of Au

A.A-(i), B-(ii), C-(iii), D-(iv) B.A-(iii), B-(iv), C-(v), D-(i) C.A-(iv), B-(ii), C-(iii), D-(i) D.A-(ii), B-(iii), C-(i), D-(v)

Wolframite ore is separated from tinstone by the process of

A.Smelting B.Calcination C.Roasting D.Electromagnetic separation

Which one of the following is not feasible

A.\(Zn(s) + Cu^{2+}(aq) \rightarrow Cu(s) + Zn^{2+}(aq)\) B.\(Cu(s) + Zn^{2+}(aq) \rightarrow Zn(s) + Cu^{2+}(aq)\) C.\(Cu(s) + 2Ag^{+}(aq) \rightarrow 2Ag(s) + Cu^{2+}(aq)\) D.\(Fe(s) + Cu^{2+}(aq) \rightarrow Cu(s) + Fe^{2+}(aq)\)

Q10

Electrochemical process is used to extract

A.Iron B.Lead C.Sodium D.silver

Q11

Flux is a substance which is used to convert

A.Mineral into silicate B.Infusible impurities to soluble impurities C.Soluble impurities to infusible impurities D.All of these

Q12

Which one of the following ores is best concentrated by froth – floatation method?

A.Magnetite B.Haematite C.Galena D.Cassiterite

Q13

In the extraction of aluminium from alumina by electrolysis, cryolite is added to

A.Lower the melting point of alumina B.Remove impurities from alumina C.Decrease the electrical conductivity D.Increase the rate of reduction

Q14

Zinc is obtained from ZnO by

A.Carbon reduction B.Reduction using silver C.Electrochemical process D.Acid leaching

Q15

Extraction of gold and silver involves leaching with cyanide ion. silver is later recovered by

A.Distillation B.Zone refining C.Displacement with zinc D.liquation

Q16

Considering Ellingham diagram, which of the following metals can be used to reduce alumina? (NEET-2018)

A.Fe B.Cu C.Mg D.Zn

Q17

The following set of reactions are used in refining Zirconium Zr (impure) + 2I\(_2\) \(\xrightarrow{523 K}\) ZrI\(_4\) ZrI\(_4\) \(\xrightarrow{1800 K}\) Zr (pure) + 2I\(_2\) This method is known as

A.Liquation B.Van Arkel process C.Zone refining D.Mond’s process

Q18

Which of the following is used for concentrating ore in metallurgy?

A.Leaching B.Roasting C.Froth floatation D.Both (a) and (c)

Q19

The incorrect statement among the following is

A.Nickel is refined by Mond’s process B.Titanium is refined by Van Arkel’s process C.Zinc blende is concentrated by froth floatation D.In the metallurgy of gold, the metal is leached with dilute sodium chloride solution

Q20

In the electrolytic refining of copper, which one of the following is used as anode?

A.Pure copper B.Impure copper C.Carbon rod D.Platinum electrode

Q21

Which of the following plot gives Ellingham diagram

A.\(\Delta\)S Vs T B.\(\Delta\)G Vs T C.\(\Delta\)G Vs 1/T D.\(\Delta\)G Vs T\(^2\)

Q22

In the Ellingham diagram, for the formation of carbon monoxide

A.\(\frac{\Delta S^0}{\Delta T}\) is negative B.\(\frac{\Delta G^0}{\Delta T}\) is positive C.\(\frac{\Delta G^0}{\Delta T}\) is negative D.initially \(\frac{\Delta G^0}{\Delta T}\) is positive, after 700 \(^0\)C, \(\frac{\Delta G^0}{\Delta T}\) is negative

Q23

Which of the following reduction is not thermodynamically feasible?

A.Cr\(_2\)O\(_3\) + 2Al \(\rightarrow\) Al\(_2\)O\(_3\) + 2Cr B.Al\(_2\)O\(_3\) + 2Cr \(\rightarrow\) Cr\(_2\)O\(_3\) + 2Al C.3TiO\(_2\) + 4Al \(\rightarrow\) 2Al\(_2\)O\(_3\) + 3Ti D.none of these

Q24

Which of the following is not true with respect to Ellingham diagram?

A.Free energy changes follow a straight line. Deviation occurs when there is a phase change. B.The graph for the formation of CO\(_2\) is a straight line almost parallel to free energy axis. C.Negative slope of CO shows that it becomes more stable with increase in temperature. D.Positive slope of metal oxides shows that their stabilities decrease with increase in temperature.

Q25

Which of the following minerals is considered an ore of aluminium because extraction is commercially profitable?

A.China clay B.Bauxite C.Kaolinite D.Malachite

Q26

In the gravity separation process, the separation of the ore from the gangue is primarily based on the difference in their:

A.Magnetic properties B.Chemical reactivity C.Specific gravities D.Solubility in acids

Q27

What is the function of collectors like pine oil or eucalyptus oil in the froth floatation method?

A.To decrease the wetting of ore particles by water B.To increase the solubility of gangue C.To act as a stabilizing agent for the foam D.To prevent the oxidation of sulphide ores

Q28

During the extraction of silver by leaching, which reagent is typically used to dissolve the metal from its ore?

A.Sodium hydroxide B.Dilute sulphuric acid C.Sodium cyanide D.Concentrated nitric acid

Q29

The process of roasting is most commonly applied for the conversion of which type of ores into their oxides?

A.Carbonate ores B.Sulphide ores C.Silicate ores D.Halide ores

Q30

Calcination differs from roasting primarily because it involves heating the ore in:

A.The presence of excess oxygen B.A vacuum C.The absence of air or limited supply of air D.The presence of a reducing agent

Q31

In the smelting of iron, quick lime (CaO) acts as a basic flux to remove silica gangue. The resulting product is:

A.Elemental silicon B.Calcium silicate (slag) C.Iron silicate D.Calcium carbide

Q32

In an Ellingham diagram, the y-axis represents which thermodynamic property for the formation of metal oxides?

A.Standard enthalpy change (\(\Delta H^0\)) B.Standard entropy change (\(\Delta S^0\)) C.Standard Gibbs free energy change (\(\Delta G^0\)) D.Equilibrium constant (K)

Q33

Which reaction in the Ellingham diagram is represented by a line with a significant negative slope, making the product more stable at higher temperatures?

A.\(C + O_2 \rightarrow CO_2\) B.\(2C + O_2 \rightarrow 2CO\) C.\(2Mg + O_2 \rightarrow 2MgO\) D.\(4Al + 3O_2 \rightarrow 2Al_2O_3\)

Q34

Electrochemical principles are preferred for the extraction of highly active metals like sodium because:

A.They have low melting points B.Their oxides are easily reduced by carbon C.Reduction by carbon is thermodynamically not feasible D.They are only found as native elements

Q35

Which refining method is suitable for low boiling volatile metals like zinc and mercury?

A.Liquation B.Zone refining C.Distillation D.Electrolytic refining

Q36

Zone refining is based on which of the following principles?

A.Differences in magnetic attraction B.Impurities are more soluble in the melt than in the solid state of the metal C.Metals form volatile compounds with specific reagents D.Differences in standard reduction potentials

Q37

In the Mond process for refining nickel, the metal is converted into which volatile compound?

A.Nickel chloride B.Nickel tetracarbonyl C.Nickel tetraiodide D.Nickel oxide

Q38

The Van Arkel process for refining titanium and zirconium uses which reagent to form a volatile intermediate?

A.Chlorine gas B.Carbon monoxide C.Iodine D.Ammonia

Q39

Which alloy of iron is known for its high resistance to corrosion and is used in manufacturing surgical instruments and cutlery?

A.Nickel steel B.Chrome steel C.Stainless steel D.Wrought iron

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About this Metallurgy test

This free online practice test covers Metallurgy from the 12th Standard Chemistry (Samacheer Kalvi) syllabus. Choose the number of questions and an optional time limit, then answer and submit — everything is checked in your browser, with the correct answers and a worked explanation shown at the end. For the full solutions to every question in this set, see the solved MCQs page.

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