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NEET • CHEMISTRY • GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

General principles and processes of isolation of elements practice · Mixed difficulty

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Showing 1-30 of 190 questions

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1 Hard

1 of 190

Remembering +4 | -1

Mac Arthur and Forest cyanide process is used in the extraction of:

View answer and explanation

Correct option: B

Ag and Au

Option B (Ag and Au) is correct because the Mac Arthur and Forest cyanide process is specifically designed for the extraction of silver and gold from their ores.

2 Medium

2 of 190

Remembering +4 | -1

Which form of iron has lowest percentage of carbon?

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Correct option: B

Wrought iron

Option B is correct because Wrought iron has the lowest percentage of carbon (0.02-0.08%) among the given options.

3 Hard

3 of 190

Analyzing +4 | -1

Assertion (A): Wolframite impurities are separated from cassiterite by electromagnetic separation.

Reason (R): Cassiterite being magnetic is attracted by the magnet and forms a separate heap.

View answer and explanation

Correct option: C

(A) is true but (R) is false

Option C is correct because while the assertion is true, the reason is false. Wolframite is magnetic and is separated from non-magnetic cassiterite, not the other way around.

4 Medium

4 of 190

Remembering +4 | -1

Which one is an ore of sodium?

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Correct option: D

Soda ash

Option D (Soda ash) is the correct answer because Soda ash (Na2CO3) is a common ore of sodium.

5 Medium

5 of 190

Understanding +4 | -1

Aluminothermic process is used for the extraction of metals, whose oxides are:

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Correct option: B

Not easily reduced by carbon

Option B (Not easily reduced by carbon) is correct because the aluminothermic process uses aluminum to reduce oxides that are more stable and difficult to reduce with carbon.

6 Easy

6 of 190

Understanding +4 | -1

In the extraction of copper, the metal formed in the Bessemer’s converter is due to the reaction:

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Correct option: D

2\mathrm{C}{\mathrm{u}_2}\mathrm{O} + \mathrm{C}{\mathrm{u}_2}\mathrm{S} \to 6\mathrm{Cu} + \mathrm{S}{\mathrm{O}_2}

Option D (

2\mathrm{C}{\mathrm{u}_2}\mathrm{O} + \mathrm{C}{\mathrm{u}_2}\mathrm{S} \to 6\mathrm{Cu} + \mathrm{S}{\mathrm{O}_2}

) is correct because this reaction represents the self-reduction of cuprous oxide by cuprous sulfide in the Bessemer converter to produce copper.

7 Medium

7 of 190

Remembering +4 | -1

Silver containing lead as impurity is purified by

View answer and explanation

Correct option: B

Cupellation

Option B (Cupellation) is correct because cupellation is a process used to purify silver containing lead as an impurity.

8 Hard

8 of 190

Analyzing +4 | -1

Statement-I: Leaching of gold with cyanide ion in absence of

air/{O_2}

leads to cyano complex of

Au\left( {III} \right).

Statement-II: Zinc is oxidized during the displacement reaction carried out for gold extraction.
In the light of the above statements, choose the correct answer from the options given below.

View answer and explanation

Correct option: D

Statement-I is incorrect but statement-II is correct

Statement-I is incorrect because leaching of gold with cyanide in the presence of air/O2 leads to the formation of the

Au(I)

complex,

[Au(CN)_2]^-

. Statement-II is correct because zinc is oxidized to

Zn^{2+}

during the displacement reaction.

9 Easy

9 of 190

Understanding +4 | -1

Leaching is a process of:

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Correct option: B

Concentration

Option B (Concentration) is correct because leaching is a method used to selectively dissolve the desired ore, thus concentrating it.

10 Easy

10 of 190

Understanding +4 | -1

In the extraction of copper metal is formed in the Bessemer converter due to reaction

View answer and explanation

Correct option: A

C{u_2}S + 2C{u_2}O \to 6Cu + S{O_2}

Option A (

Cu_2S + 2Cu_2O \to 6Cu + SO_2

) is correct because this reaction represents the self-reduction of copper oxides and sulfides in the Bessemer converter.

11 Medium

11 of 190

Understanding +4 | -1

Identify the reaction that does not take place in a blast furnace.

View answer and explanation

Correct option: C

2\mathrm{F}{\mathrm{e}_2}{\mathrm{O}_3} + 3\mathrm{C} \to 4\mathrm{Fe} + 3\mathrm{C}{\mathrm{O}_2}

Option D (

CO_2 + C \to 2CO

) is correct because the reverse reaction,

2CO \to CO_2 + C

(Boudouard reaction), is favored at lower temperatures in the blast furnace, not the forward reaction.

12 Medium

12 of 190

Remembering +4 | -1

Cyanide process is used to extraction of

View answer and explanation

Correct option: A

Option A (Ag) is correct because the cyanide process is used to extract gold and silver from their ores by forming soluble cyanide complexes.

13 Easy

13 of 190

Remembering +4 | -1

Vapour phase refining of nickel is carried out by using

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Correct option: D

\mathrm{CO}

Option D (CO) is correct because carbon monoxide (CO) is used in the Mond process for vapor phase refining of nickel.

14 Medium

14 of 190

Understanding +4 | -1

In the extraction of copper from its sulphide ore, the metal is finally obtained by the reduction of cuprous oxide with:

View answer and explanation

Correct option: B

Sulphur dioxide

Option B (Sulphur dioxide) is correct because in the final step, Cu2O is reduced to Cu by SO2 during self-reduction of copper sulphide ore.

15 Medium

15 of 190

Remembering +4 | -1

Which of the following metal is correctly matched with its ore?
Metal

\;\;\;\;

Ore

View answer and explanation

Correct option: A

Zinc

\;\;\;\;

Calamine

Option A (Zinc - Calamine) is correct because Calamine (

ZnCO_3

) is a well-known ore of Zinc.

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16 Medium

16 of 190

Understanding +4 | -1

The salt which is least likely to be found in minerals is:

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Correct option: B

Acetate

Option B (Acetate) is correct because acetate salts are organic salts and less likely to be found in minerals compared to inorganic salts like sulfates, chlorides, and sulfides.

17 Medium

17 of 190

Understanding +4 | -1

Considering Ellingham diagram, which of the following metals can be used to reduce alumina?

View answer and explanation

Correct option: C

\mathrm{Mg}

Option C (Mg) is correct because, according to the Ellingham diagram, magnesium has a lower Gibbs free energy of oxide formation than aluminum, making it a stronger reducing agent.

18 Medium

18 of 190

Understanding +4 | -1

In the metallurgy of iron, when limestone is added to the blast furnace, the calcium ions end up in

View answer and explanation

Correct option: A

Calcium silicate (slag)

Option A (Calcium silicate (slag)) is correct because limestone (CaCO3) decomposes to CaO, which then reacts with silica (SiO2) to form calcium silicate slag.

19 Easy

19 of 190

Understanding +4 | -1

Metallurgy is the process of:

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Correct option: C

Extracting the metal from the ore

Option C (Extracting the metal from the ore) is correct because metallurgy is the science and technology of extracting metals from their ores.

20 Medium

20 of 190

Understanding +4 | -1

Alloy formation gives rise to:

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Correct option: D

All are correct

Option D (All are correct) is correct because alloy formation generally leads to decreased corrosion, increased hardness, and decreased conductivity.

21 Easy

21 of 190

Remembering +4 | -1

Which one is malachite from the following?

View answer and explanation

Correct option: D

CuC{O_3}.\,Cu{(OH)_2}

Option D (

CuCO_3.\,Cu(OH)_2

) is correct because it represents the chemical formula of malachite, a copper carbonate hydroxide mineral.

22 Easy

22 of 190

Remembering +4 | -1

Which of the following is correct?

View answer and explanation

Correct option: C

Calomel is used medically as purgative

Option C is correct because calomel (Hg2Cl2) is used medically as a purgative (laxative).

23 Hard

23 of 190

Understanding +4 | -1

Which of the following statements are incorrect?

I. Zinc can be extracted by self-reduction.

II. A depressant prevents certain type of particles to come to the froth.

III. Copper matte contains

{ZnS}

and

{Cu}_2{S}

.

IV. The solidified copper obtained from reverberatory furnace has blistered appearance due to evolution of

{SO}_2

during the extraction.

View answer and explanation

Correct option: C

I and III

Option C (I and III) is correct because Zinc cannot be extracted by self-reduction, and copper matte contains Cu2S and FeS, not ZnS.

24 Medium

24 of 190

Understanding +4 | -1

Which of the following statements regarding the metallurgy of magnesium using electrolytic method is not correct?

View answer and explanation

Correct option: D

Molten magnesium is heavier than the electrolyte

Option D (Molten magnesium is heavier than the electrolyte) is correct because molten magnesium is lighter than the electrolyte (MgCl2 + NaCl + NaF).

25 Hard

25 of 190

Analyzing +4 | -1

Which of the following statements about the advantages of roasting of sulphide ore before reduction is not true?

View answer and explanation

Correct option: D

Carbon and hydrogen are suitable reducing agents for metal sulphides

Option D is correct because carbon and hydrogen are generally not suitable reducing agents for metal sulfides directly; roasting converts the sulfide to an oxide, which is then reduced.

26 Easy

26 of 190

Understanding +4 | -1

Which method of purification is represented by the following equations

Ti + 2{I_2}\xrightarrow{{523\,K}}Ti{I_4}\xrightarrow{{1700\,K}}Ti + 2{I_2}

View answer and explanation

Correct option: C

Van Arkle

Option C (Van Arkle) is correct because the given equations represent the Van Arkel method, which involves forming a volatile iodide to purify metals.

27 Easy

27 of 190

Remembering +4 | -1

Composition of azurite mineral is

View answer and explanation

Correct option: C

2\mathrm{CuC}{\mathrm{O}_3}.\mathrm{Cu}{\left( {\mathrm{OH}} \right)_2}

Option C is correct because the chemical formula for azurite is

2\mathrm{CuC}{\mathrm{O}_3}.\mathrm{Cu}{\left( {\mathrm{OH}} \right)_2}

28 Easy

28 of 190

Remembering +4 | -1

Which of the following pairs of metal is purified by zone refining method ?

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Correct option: D

Si and Ge

Option D is correct because Silicon (Si) and Germanium (Ge) are semiconductors that are commonly purified using the zone refining method.

29 Medium

29 of 190

Understanding +4 | -1

Softening of lead means:

View answer and explanation

Correct option: C

Removal of metallic impurities from lead

Option C (Removal of metallic impurities from lead) is correct because softening of lead refers to the removal of impurities like tin, antimony, and arsenic.

30 Hard

30 of 190

Remembering +4 | -1

In Mac Arthur forrest method, silver is extracted from the solution of

\mathrm{Na}\left[ {\mathrm{Ag}{{\left( {\mathrm{CN}} \right)}_2}} \right]

by the use of

View answer and explanation

Correct option: D

Option D (Zn) is correct because Zinc is used as a reducing agent to precipitate silver from the complex ion solution in the Mac Arthur Forrest method.

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Key Takeaways

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