Isolation of Elements Test 4

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Isolation of Elements Test 4

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Question 1
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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

A
CaSiO₃ and CaO

B
CaSiO₃ and SiO₂

C
CaO + SiO₃

D
SiO₂and CaSiO₃

Solution

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.
Question 2
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Froth flotation process is based on

A
Specific gravity of the particles

B
Magnetic properties of the particles

C
Wetting properties of the particles

D
Electrical properties of the particles

Solution

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.
Question 3
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Which one of the following ores is concentrated by chemical leaching method?

A
Galena

B
Copper pyrite

C
CaO + SiO₃

D
SiO₂ and CaSiO₃

Solution

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.
Question 4
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Which of the ore dressing process requires finest size of ore?

A
Froth floatation

B
Gravity separation

C
Magnetic Separation

D
All of these

Solution

The ore is crushed into a fine powder and mixed with water to form suspension.
Question 5
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Wolframite(FeWO₄) impurities present in cassiterite (SnO₂) can be separated by the process of

A
Froth Floatation

B
Electromagnetic

C
Zone refining

D
Gravity separation

Solution

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).
Question 6
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In the metallurgical process, the flux used for removing acidic impurities is

A
Silica

B
Sodium Chloride

C
Lime stone

D
Sodium Carbonate

Solution
Question 7
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Gravity method of ore concentration depends on

A
Preferential wetting properties of particles

B
Difference in the the specific gravity of ore and gangue particles

C
Fusion temperature of gangue and ore particles

D
Magnetic properties of gangue and ore particles

Solution

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.
Question 8
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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?

A
Sphalerite

B
Argentite

C
Galena

D
Copper pyrites

Solution

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.
Question 9
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The slag formed in the extraction of iron from haematite in the blast furnace is:

A
CaSiO₃

B
FeSiO₃

C
MgSiO₃

D
CaCO₃

Solution
Question 10
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In the froth floatation process for benefaction of the ores, the ore particles float because

A
They are light

B
Their surface is not easily wetted by water

C
They are insoluble

D
They bear electric charge

Solution

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.
Question 11
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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.

A

B

C

D

Solution

(i) → (r), (ii) → (p), (iii) → (q), (iv) → (s)
Question 12
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Match the Column I with Column II and mark the correct option from the codes given below.

A
a

B
b

C
c

D
d

Solution

(i) → (q), (ii) → (r,t), (iii) → (p), (iv)→ (s)
Question 13
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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.

A
Both Statement I and Statement II are correct and Statement II is the correct explanation of Statement I

B
Both Statement I and Statement II are correct and Statement II is not the correct explanation of Statement I

C
Statement I is correct but Statement li is incorrect

D
Statement II is correct but Statement I is incorrect

Solution

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