Question 1

Which of the following is an example of a native ore, and what is its chemical formula?

Accepted Answer

Gold, $\mathrm{Au}$

Question 2

Which of the following statements best describes the role of flux in metallurgy?

Accepted Answer

Flux reacts with impurities to form a fusible mass called slag.

Question 3

During the concentration of ores by hydraulic washing, which physical property is primarily utilized?

Accepted Answer

Difference in densities (gravities) of ore and gangue particles

Question 4

Which of the following pairs is correctly matched with respect to the type of ore and the metal extracted?

Accepted Answer

Galena – Lead

Question 5

A mixture of sulphide ores of PbS and ZnS is to be separated by froth flotation. Which chemical is used as a depressant to selectively prevent ZnS from forming froth?

Accepted Answer

Sodium cyanide, $\mathrm{NaCN}$

Question 6

Which of the following is a correct statement about slag formation in metallurgy?

Accepted Answer

Slag is formed by the reaction of flux with impurities.

Question 7

Which ore is concentrated using magnetic separation due to its magnetic properties?

Accepted Answer

Magnetite, $\mathrm{Fe_3O_4}$

Question 8

Which of the following is a basic flux used in the extraction of iron from its ore?

Accepted Answer

$\mathrm{CaO}$

Question 9

In the froth flotation process, which property of sulphide ores is exploited for their separation from gangue?

Accepted Answer

Greater wettability by oil than by water

Question 10

Which of the following is NOT a carbonate ore?

Accepted Answer

Haematite

Question 11

Which of the following correctly matches the ore with the metal it is a source of?

Accepted Answer

Cinnabar – Mercury

Question 12

Which of the following is a sulphide ore of silver?

Accepted Answer

Argentite, $\mathrm{Ag_2S}$

Question 13

Which of the following is an example of a halide ore?

Accepted Answer

Horn silver, $\mathrm{AgCl}$

Question 14

Which of the following statements about gangue is correct?

Accepted Answer

Gangue is the earthy impurity associated with the ore.

Question 15

Which of the following is the correct order of steps in the metallurgical process for isolation of a metal from its ore?

Accepted Answer

Crushing → Concentration → Isolation → Refining

Question 16

Which of the following is a correct example of a basic impurity and the acidic flux used to remove it?

Accepted Answer

Calcium oxide ($\mathrm{CaO}$) as impurity, silica ($\mathrm{SiO_2}$) as flux

Question 17

Which of the following is a hydrocarbonate ore?

Accepted Answer

Malachite, $\mathrm{CuCO_3 \cdot Cu(OH)_2}$

Question 18

Which of the following is the correct chemical formula for calamine?

Accepted Answer

$\mathrm{ZnCO_3}$

Question 19

Which of the following is a correct statement about the economic impact of the Froth Flotation Method on copper mining?

Accepted Answer

It allowed copper to be extracted from low-grade ores, increasing supply and reducing cost.

Question 20

Which of the following is a correct match between the ore and its type?

Accepted Answer

Malachite – Carbonate

Isolation of Elements: Principles and Processes

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