Metallurgy Additional Practice Test

12th Standard Chemistry — Metallurgy: Additional Online Practice Test

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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

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

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

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

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

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

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

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)

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.\(4Al + 3O_2 \rightarrow 2Al_2O_3\)

Q10

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

Q11

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

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

Q12

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

Q13

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

Q14

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

Q15

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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