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Test: Minerals and ores - JEE MCQ


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15 Questions MCQ Test - Test: Minerals and ores

Test: Minerals and ores for JEE 2024 is part of JEE preparation. The Test: Minerals and ores questions and answers have been prepared according to the JEE exam syllabus.The Test: Minerals and ores MCQs are made for JEE 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Minerals and ores below.
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Test: Minerals and ores - Question 1

Which of the following statement is not correct about Ellingham diagram?

Detailed Solution for Test: Minerals and ores - Question 1

Ellingham diagrams are based on thermodynamic concepts. It does not tell anything about the kinetics of the reduction process.

Test: Minerals and ores - Question 2

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

Detailed Solution for Test: Minerals and ores - Question 2

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

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Test: Minerals and ores - Question 3

Which among the following is used as flux in the extraction of iron from oxide ores?

Detailed Solution for Test: Minerals and ores - Question 3

Lime stone (CaCO3) used in the extraction of Fe from haematite in blast furnace get decomposed to CaO, which removes silicate impurity (gangue) of the ore as molten slag.

Test: Minerals and ores - Question 4

When is electrolysed using platinum electrodes,

Detailed Solution for Test: Minerals and ores - Question 4



At cathode
At anode

Test: Minerals and ores - Question 5

Which of the following is not added during the extraction of silver by cyanide process?

Detailed Solution for Test: Minerals and ores - Question 5

In the extraction of silver from cyanide process (also Mac-Arthur Forrest process), the siliver compound dissolve in NaCN solution forming a
soluble complex salt, in presence of air, then silver is precipitated from this complex salt by the addition of Zn, because Zn being more reactive displaces the Ag.

Test: Minerals and ores - Question 6

Cryolite is

Detailed Solution for Test: Minerals and ores - Question 6

is cryolite and used in the electrolysis of alumina to lower the melting point and increase electrical conductivity.

Test: Minerals and ores - Question 7

The following reactions take place in the blast furnace in the preparation of impure iron. Identify the reaction pertaining to the formation of the slag.

Detailed Solution for Test: Minerals and ores - Question 7

In blast furnace at about , calcium carbonate is almost completely decomposed to give which acts as a flux and combines with present as impurity (gangue) in the ore to form calcium silicate (fusible slag)

CaO(s) + SiO2(s) ⟶ CaSiO3( s)
(basic flux) (acidic flux) 

Test: Minerals and ores - Question 8

Aluminium is extracted from alumina by electrolysis of a molten mixture of

Detailed Solution for Test: Minerals and ores - Question 8

Fused alumina is a bad conductor of electricity. Therefore, cryolite and fluorspar are added to purified alumina which not onlymake alumina a good conductor of electricity but also reduce the melting point of the mixture to around .

Test: Minerals and ores - Question 9

Correct match is:

Detailed Solution for Test: Minerals and ores - Question 9

Roasted mass obtained from roasting step is called matte.

Test: Minerals and ores - Question 10

Consider the following metallurgical processes:
(I) Heating impure metal CO and distilling the resulting volatile carbonyl (b.p. ) and finally decomposition at to get the pure metal
(II) Heating the sulphide ore in air until a part is converted to oxide and then furher heating in the absence of air to let the oxide react with unchanged metal sulphide
(III) Electrolysis of the molten electrolyte containing approximately equal amounts of the metal chloride and to obtained the metal The processes used for obtaning magnesium, nickel and copper are respectively:

Detailed Solution for Test: Minerals and ores - Question 10

Test: Minerals and ores - Question 11

When copper pyrites is roasted in excess of air, a mixture of is formed. is present as impurity. This can be removed as slag during reduction of . The flux added to form slag is

Detailed Solution for Test: Minerals and ores - Question 11

Test: Minerals and ores - Question 12

What is the role of limestone during the extraction of iron from haematite ore?

Detailed Solution for Test: Minerals and ores - Question 12

During extraction of iron from haematite ore, roasted ore, along with coke and limestone is heated in blast furnance. Here coke behaves as reducing agent and limestone is worked as flux. In this process, in reducing zone , spongy iron is obtained. In slag zone , limestone reacts with impurity (e.g., silica) to form slag. In the combustion and fusion zone , all the charge melts and pig iron is obtained which purified further.

Test: Minerals and ores - Question 13

In the extraction of aluminium by Hall-Heroult process, purified is mixed with to
(i) lower the melting point of .
(ii) increase the conductivity of molten mixture.
(iii) reduce into .
(iv) acts as catalyst.

Detailed Solution for Test: Minerals and ores - Question 13

In the extraction of aluminium by HallHeroult process purified Al2O3 is mixed with CaF2 to lower the melting point by Al2O3 and increase the conductivity of molten mixture

Test: Minerals and ores - Question 14

In Hall-Heroult process how much carbon anode is burnt away to produce each of aluminium?

Detailed Solution for Test: Minerals and ores - Question 14

For each of produced, about of carbon anode is burnt away.

Test: Minerals and ores - Question 15

Which statement is incorrect regarding Hall-Heroult process for metallurgy of aluminium?
1. Use of lowers the melting point of
2. Steel vessel with lining of carbon acts as cathode.
3. Graphite is used as anode.
4. Carbon dioxide gas is generated at cathode.

Detailed Solution for Test: Minerals and ores - Question 15

In Hall-Heroult process for extraction of aluminium (crude) from alumina (Al2O3).
Statements (1), (2) and (3) are correct because cryolite (Na3AlF6) is added to Al2O3 to lower, its melting point. Here, steel vessel with lining of carbon acts as cathode and graphite acts as anode, but statement (4) is incorrect because Al gets deposited at cathode.

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