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Test: Metallurgy Process of Concentration of Ores


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25 Questions MCQ Test Chemistry Class 12 | Test: Metallurgy Process of Concentration of Ores

Test: Metallurgy Process of Concentration of Ores for NEET 2022 is part of Chemistry Class 12 preparation. The Test: Metallurgy Process of Concentration of Ores questions and answers have been prepared according to the NEET exam syllabus.The Test: Metallurgy Process of Concentration of Ores MCQs are made for NEET 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Metallurgy Process of Concentration of Ores below.
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Test: Metallurgy Process of Concentration of Ores - Question 1

Only One Option Correct Type

This section contains 10 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE is correct

Q.

Flux is often added to remove impurities from an iron ore in a blast furnace. In the reaction slag and flux are

CaO + SiO2 →CaSiO3 

The slag and the flux are

Detailed Solution for Test: Metallurgy Process of Concentration of Ores - Question 1

The ores even after concentration , contain some ganghue.To remove these gangue particle cortain substance are mixed to form a fushible ore which combite with the gangue to form a fusible meterial which is not solution in molten metal . The sulstances used are called fluxed and the fasible merterial formed during reduction process is called slag
Slag is usually lighly and thus on the surface of the moltes metal

Flaxtes are classified as (i) acidic flox and (ii) basic , flex An acoidic flux siles bores etc is the chenical substans which removes the imparities.

Test: Metallurgy Process of Concentration of Ores - Question 2

Froth flotation process is based on

Detailed Solution for Test: Metallurgy Process of Concentration of Ores - Question 2

This method is based upon the fact that the surface of sulphide over is preferentially wetted by oils while that of gangue is preferentially wetted by water.

Test: Metallurgy Process of Concentration of Ores - Question 3

Which one of the following ores is concentrated by chemical leaching method?

Detailed Solution for Test: Metallurgy Process of Concentration of Ores - Question 3

In this process the finely divided powdered argentite or the native silver or gold is treated with a dilute solution (0.5%) of sodium or potassium cyanide while a current of air is continuously passed. As a result silver pass into solution forming their respective soluble complex cyanides while the impurities remain unaffected which are filtered off.

Test: Metallurgy Process of Concentration of Ores - Question 4

Which of the ore dressing process requires finest size of ore?

Detailed Solution for Test: Metallurgy Process of Concentration of Ores - Question 4

The ore is crushed into a fine powder and mixed with water to form suspension.

Test: Metallurgy Process of Concentration of Ores - Question 5

Wolframite(FeWO4) impurities present in cassiterite (SnO2) can be separated by the process of

Detailed Solution for Test: Metallurgy Process of Concentration of Ores - Question 5

Electromagnetic separation method of concentration is employed when either the ore or the impurities associated with it are magnetic in nature. Tinstone or cassiterite (SnO2) an ore of tin being non-magnetic can be separated from magnetic impurities (FeWO4).

Test: Metallurgy Process of Concentration of Ores - Question 6

In the metallurgical process, the flux used for removing acidic impurities is

Detailed Solution for Test: Metallurgy Process of Concentration of Ores - Question 6

 
 

Test: Metallurgy Process of Concentration of Ores - Question 7

Gravity method of ore concentration depends on

Detailed Solution for Test: Metallurgy Process of Concentration of Ores - Question 7

The mineral particle becom es wet by oils while the gangue particles by water. A rotating paddle agitates the mixtures and draws air in it. As a result froth is formed which carrier the mineral particles. The froth is light and is skimmed of. If is then dried for recovery of the ore particles.

Test: Metallurgy Process of Concentration of Ores - Question 8

Sulphide ores of metals are usually concentrated by froth floatation process.Which one of the following sulphide ores offers an exception and  is concentrated by leaching?

Detailed Solution for Test: Metallurgy Process of Concentration of Ores - Question 8

Leaching This process consists in treating the powdered ore with a suitable reagent (such as acids, bases or other chemicals) which can selectively dissolves the ore but not the impuritier. It is used to extract silver metals.

Test: Metallurgy Process of Concentration of Ores - Question 9

The slag formed in the extraction of iron from haematite in the blast furnace is:

Detailed Solution for Test: Metallurgy Process of Concentration of Ores - Question 9


Test: Metallurgy Process of Concentration of Ores - Question 10

In the froth floatation process for benefaction of the ores, the ore particles float because

Detailed Solution for Test: Metallurgy Process of Concentration of Ores - Question 10

The ore particles preferentially wetted by the oil become lighter and thus rise to the surface along with the froth while the gangue particle wetted by wated become heavier and thus settle down at the bottom.

*Multiple options can be correct
Test: Metallurgy Process of Concentration of Ores - Question 11

One or More than One Options Correct Type

This section contains 5 multiple type questions. Each question has 4 choices (a), (b), (c) and (d), out of which ONE or MORE THAN ONE are correct.?

Q.

The ore that is concentrated by froth floatation process is

Detailed Solution for Test: Metallurgy Process of Concentration of Ores - Question 11

Cinnabar, Galena , zinc blende are concetrated by froth floatation method.

*Multiple options can be correct
Test: Metallurgy Process of Concentration of Ores - Question 12

In froth floatation process the particles of the ore come on the froth because

Detailed Solution for Test: Metallurgy Process of Concentration of Ores - Question 12

They are light and water repellent.

*Multiple options can be correct
Test: Metallurgy Process of Concentration of Ores - Question 13

Purification of bauxite is called

Detailed Solution for Test: Metallurgy Process of Concentration of Ores - Question 13

Hoope's method is used to obtain aluminium of very high purity. The metal obtained in the Hall-Heroult process is about 99% pure and for most purposes it is taken as pure metal. However further purification of aluminium can be carried out by the Hoope’s process. This is an electrolytic process.

*Multiple options can be correct
Test: Metallurgy Process of Concentration of Ores - Question 14

The common impurities found in bauxite are

Detailed Solution for Test: Metallurgy Process of Concentration of Ores - Question 14

The common impurities present in bauxite are Fe2O3 and SiO2.

*Multiple options can be correct
Test: Metallurgy Process of Concentration of Ores - Question 15

Which of the following chemicals are involved in froth floatation process?

Detailed Solution for Test: Metallurgy Process of Concentration of Ores - Question 15

Flux is not involved in froth floatation process.

Test: Metallurgy Process of Concentration of Ores - Question 16

Comprehension Type

This section contains a passage describing theory, experiments, data, etc. Two questions related to the paragraph have been given. Each question has only one correct answer out of the given 4 options (a), (b), (c) and (d).

Passage

Most of the ores available in nature contain large amount of impurities i.e. gangue. The pretreatment of ores, based on physical properties and without bringing out any major chemical change in the ore is called ore dressing or ore concentration.

Q. Which of the following is related to ore concentration?

Detailed Solution for Test: Metallurgy Process of Concentration of Ores - Question 16

The process by which lighter earthly particles are free from the heavier ore particles by washing with water is called levigation.

Test: Metallurgy Process of Concentration of Ores - Question 17

Most of the ores available in nature contain large amount of impurities i.e. gangue. The pretreatment of ores, based on physical properties and without bringing out any major chemical change in the ore is called ore dressing or ore concentration.

Q. 

In the purification of bauxite by leaching, the chemicals employed in Baeyer’s and Hall’s process respectively are

Detailed Solution for Test: Metallurgy Process of Concentration of Ores - Question 17

In the Baeyer process Al2O3 is obtained from bauxite ore by treating the powered ore with a strong solution of NaOH when alumina (Al2O3) dissolves forming sodium mefa-aluminate leaving behind impurities.

Test: Metallurgy Process of Concentration of Ores - Question 18

Matching List Type

Choices for the correct combination of elements from Column I and Column II are given as options (a), (b), (c) and (d), out of which one is correct.

Q. 

Match the Column I with Column II and mark the correct option from the codes given below.

Detailed Solution for Test: Metallurgy Process of Concentration of Ores - Question 18

(i) → (r), (ii) → (p), (iii) → (q), (iv) → (s)

Test: Metallurgy Process of Concentration of Ores - Question 19

Match the Column I with Column II and mark the correct option from the codes given below.

Detailed Solution for Test: Metallurgy Process of Concentration of Ores - Question 19

(i) → (q), (ii) → (r,t), (iii) → (p), (iv)→ (s)

*Answer can only contain numeric values
Test: Metallurgy Process of Concentration of Ores - Question 20

One Integer Value Correct Type

This section contains 5 questions, when worked out will result in an integer value from 0 to 9 (both inclusive).

Q.

The number of ores concentrated by froth floatation process among cassiterite, galena, zinc blende, chromite, haematite, copper iron pyrites


Detailed Solution for Test: Metallurgy Process of Concentration of Ores - Question 20

Galena, zinc blende and copper iron pyrites are concentrated by froth floatation method.

*Answer can only contain numeric values
Test: Metallurgy Process of Concentration of Ores - Question 21

The number of ores concentrated by leaching or wet process among calamine, tinstone, bauxite, argentite, horn silver, galena, cinnabar, native gold


Detailed Solution for Test: Metallurgy Process of Concentration of Ores - Question 21

Bauxite, horn silver, native gold, tinstone.

*Answer can only contain numeric values
Test: Metallurgy Process of Concentration of Ores - Question 22

In the leaching of Ag2S with NaCN the equation is

Ag2S + 4NaCN → 2Na[Ag(CN)2] + Na2S. In this change in oxidation state of silver.


Detailed Solution for Test: Metallurgy Process of Concentration of Ores - Question 22

In this reaction oxidation state of silver is zero.

*Answer can only contain numeric values
Test: Metallurgy Process of Concentration of Ores - Question 23

Number of ores concentrated by Levigation (hydraulic washing) among pitche blende, tinstone, chromite, galena, copper pyrites, argentite.


Detailed Solution for Test: Metallurgy Process of Concentration of Ores - Question 23

Pitche blende, tinstone, chromite are purified by levigation.

*Answer can only contain numeric values
Test: Metallurgy Process of Concentration of Ores - Question 24

The number of magnetic substances among : tinstone, wolframite, chromite, magnetite, pyrolusite, rutile, magnesite, sphalerite


Detailed Solution for Test: Metallurgy Process of Concentration of Ores - Question 24

Wolframite, chromite, magnetite, rutile (contain iron impurities).

Test: Metallurgy Process of Concentration of Ores - Question 25

Statement Type

Direction : This section is based on Statements I and Statements II. Select the correct answer from the codes given below.

Q. 

Statement I : Cresol and aniline are froth stabilisers.

Statement II : Collectors enhance the non-wettability of the ore particles.

Detailed Solution for Test: Metallurgy Process of Concentration of Ores - Question 25

Because cresol and aniline are froth stabilisers, but only ethyl xanthate, pine oil which enhance non-wettability of ore particles.

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