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Conversion of stannous salts to stannic salts

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

General principles and processes of isolation of elements practice · Medium

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These sets use single-correct-answer MCQs. They do not cover every JEE Main or JEE Advanced question format and are not full-length mock papers.

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Showing 31-60 of 175 questions

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31 Medium

31 of 175

Analyzing +4 | -1

Which of the following factors is of no significance for roasting sulphide ores to the oxides and not subjecting the sulphide ores to carbon reduction directly?

View answer and explanation

Correct option: C

Metal sulphides are less stable than the corresponding oxides

Option C (Metal sulphides are less stable than the corresponding oxides) is the factor of no significance because metal sulfides are generally *more* stable than their corresponding oxides, which is why roasting is necessary.

32 Medium

32 of 175

Remembering +4 | -1

Among the followings, Which ore contains both sulphur and copper?

View answer and explanation

Correct option: D

both (2) and (3)

Option D (both (2) and (3)) is correct because both Chalcoite (

Cu_2S

) and Chalcopyrite (

CuFeS_2

) contain both copper and sulfur.

33 Medium

33 of 175

Remembering +4 | -1

Gold when dissolved in aqua-regia gives:

View answer and explanation

Correct option: C

Chloroauric acid

Option C (Chloroauric acid) is correct because gold dissolves in aqua regia to form chloroauric acid (

\mathrm{HAuCl}_4

34 Medium

34 of 175

Remembering +4 | -1

Which of the following ore is concentrated using group 1 cyanide salt?

View answer and explanation

Correct option: D

Sphalerite

Option D is correct because Sphalerite (ZnS) ore is concentrated using group 1 cyanide salts like NaCN as a depressant in the froth flotation method.

35 Medium

35 of 175

Remembering +4 | -1

Froth stabiliser used in froth floatation process is

View answer and explanation

Correct option: C

Cresols

Option C (Cresols) is correct because cresols are used as froth stabilizers in the froth floatation process.

36 Medium

36 of 175

Remembering +4 | -1

CO on passing over heated nickel gives:

View answer and explanation

Correct option: B

\mathrm{Ni}{\left( {\mathrm{CO}} \right)_4}

Option B (

\mathrm{Ni}{\left( {\mathrm{CO}} \right)_4}

) is correct because nickel reacts with carbon monoxide at around 330 K to form nickel carbonyl, which is a volatile compound.

37 Medium

37 of 175

Remembering +4 | -1

Mercury is transported in mental containers made up of:

View answer and explanation

Correct option: A

\mathrm{Fe}

Option A (

\mathrm{Fe}

) is correct because iron does not form an amalgam with mercury, making it suitable for containing and transporting mercury.

38 Medium

38 of 175

Understanding +4 | -1

Which is incorrect as the uses of lime stone in industries are concerned?

View answer and explanation

Correct option: B

In the extraction of Sn from its ore

Option B (In the extraction of Sn from its ore) is correct because limestone is not used in the extraction of Sn from its ore.

39 Medium

39 of 175

Remembering +4 | -1

A metal which is refined by poling is

View answer and explanation

Correct option: C

Blister copper

Option C (Blister copper) is correct because poling is used to refine blister copper by reducing copper oxide impurities.

40 Medium

40 of 175

Understanding +4 | -1

Leaching of gold with dilute aqueous solution of

NaCN

in presence of oxygen gives complex [A], which on reaction with zinc forms the elemental gold and another complex [B]. [A] and [B], respectively are:

View answer and explanation

Correct option: C

{\left[ {Au{{(CN)}_2}} \right]^ - }\,\,{\text{and}}\,\,{\left[ {Zn{{(CN)}_4}} \right]^{2 - }}

The correct answer is C (

{\left[ {Au{{(CN)}_2}} \right]^ - }\,\,{\text{and}}\,\,{\left[ {Zn{{(CN)}_4}} \right]^{2 - }}

) because gold leaching forms

[Au(CN)_2]^-

and its reaction with zinc yields

[Zn(CN)_4]^{2-}

41 Medium

41 of 175

Understanding +4 | -1

A sulphide ore is generally roasted to the oxide before reduction, because

View answer and explanation

Correct option: A

The enthalpy of formation of

{CO}_2

is more than that of

{CS}_2

The correct answer is that the enthalpy of formation of

{CO}_2

is more than that of

{CS}_2

because the more stable

{CO}_2

has a higher enthalpy of formation, making the conversion thermodynamically favorable.

42 Medium

42 of 175

Remembering +4 | -1

The major component of which of the following ore is sulphide based mineral?

View answer and explanation

Correct option: A

Sphalerite

Option A (Sphalerite) is correct because Sphalerite (ZnS) is a sulphide-based mineral, while the others are carbonate or hydroxide-based.

43 Medium

43 of 175

Remembering +4 | -1

Pig iron is converted into steel by reducing the amount of carbon contained in it, in a:

View answer and explanation

Correct option: C

Bessemer’s converter

Option C (Bessemer’s converter) is correct because the Bessemer process is specifically designed to convert pig iron into steel by reducing the carbon content through oxidation.

44 Medium

44 of 175

Remembering +4 | -1

The lining in blast furnace are made up of:

View answer and explanation

Correct option: C

Fireclay bricks

Option C (Fireclay bricks) is correct because fireclay bricks are used to line blast furnaces due to their high resistance to heat and chemical attack.

45 Medium

45 of 175

Understanding +4 | -1

Given below are two statements.
Statement-I : Pig iron is obtained by heating cast iron with scrap iron.
Statement-II : Pig iron has a relatively lower carbon content than that of cast iron.
In the light of the above statements, choose the correct answer from the options given below.

View answer and explanation

Correct option: B

Both Statement-I and Statement-II are not correct.

Option B is correct because pig iron is used to make cast iron, and pig iron has a higher carbon content than cast iron.

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46 Medium

46 of 175

Remembering +4 | -1

Which of the following is subjected to Leaching process during concentration of ore

View answer and explanation

Correct option: A

Bauxite

Option A (Bauxite) is correct because bauxite ore is commonly concentrated using the leaching process to remove impurities like silica and iron oxides.

47 Medium

47 of 175

Remembering +4 | -1

Wolframite ore contains:

View answer and explanation

Correct option: B

\mathrm{W}

Option B (

\mathrm{W}

) is correct because Wolframite is an ore of tungsten (W).

48 Medium

48 of 175

Understanding +4 | -1

Assertion (A) : Reduction of

\mathrm{ZnO}

with carbon is done at

1100^{\circ} \mathrm{C}

.

Reason (R) : At this temperature,

\Delta G^{\circ}

is negative thus process is spontaneous.

View answer and explanation

Correct option: A

Both

\mathbf{A}

and

\mathbf{R}

are true and

\mathbf{R}

is the correct explanation of

\mathbf{A}

Option A is correct because the reduction of

\mathrm{ZnO}

with carbon is indeed done at around

1100^{\circ} \mathrm{C}

, and at this temperature,

\Delta G^{\circ}

is negative, making the process spontaneous.

49 Medium

49 of 175

Understanding +4 | -1

Assertion : Coke and flux are used in smelting.

Reason : The phenomenon in which ore is mixed with suitable flux and coke is heated to fusion is known as smelting.

View answer and explanation

Correct option: B

If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.

Option B (If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.) is correct because both coke and flux are used in smelting, and smelting involves heating the ore with flux and coke, but the reason doesn't directly explain why both are used.

50 Medium

50 of 175

Remembering +4 | -1

Cyanide process is used in the extraction of

View answer and explanation

Correct option: D

Both (a) and (c)

Option D (Both (a) and (c)) is correct because the cyanide process is used to extract both gold (Au) and silver (Ag) from their ores by forming soluble cyanide complexes.

51 Medium

51 of 175

Remembering +4 | -1

Tin plague means-

View answer and explanation

Correct option: B

Conversion of white tin to grey tin

Option B (Conversion of white tin to grey tin) is correct because tin plague refers to the allotropic transformation of white tin to grey tin at low temperatures.

52 Medium

52 of 175

Understanding +4 | -1

The final step in the metallurgical extraction of Cu metal from Cu pyrites takes place in a Bessemer converter. The reaction taking place is:

View answer and explanation

Correct option: C

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 C is correct because the final step in copper extraction from copper pyrites involves the auto-reduction of cuprous oxide and cuprous sulfide to produce copper and sulfur dioxide.

53 Medium

53 of 175

Understanding +4 | -1

Alloy formation gives rise to:

View answer and explanation

Correct option: D

All are correct

Option D (All are correct) is correct because alloy formation typically leads to decreased corrosion, increased hardness, and decreased conductivity compared to the pure metals.

54 Medium

54 of 175

Remembering +4 | -1

Stainless steel has iron and

View answer and explanation

Correct option: A

Option A (Cr) is correct because stainless steel is an alloy of iron and chromium, which provides corrosion resistance.

55 Medium

55 of 175

Remembering +4 | -1

Which of the following metal is extracted by the amalgamation process?

View answer and explanation

Correct option: B

Silver

Option B (Silver) is correct because the amalgamation process is specifically used for the extraction of silver from its ore.

56 Medium

56 of 175

Remembering +4 | -1

Which is not essential for rusting?

View answer and explanation

Correct option: C

Carbon dioxide

Option C (Carbon dioxide) is correct because while carbon dioxide can enhance rusting, it is not essential. Oxygen, water, and iron are all essential for the rusting process.

57 Medium

57 of 175

Remembering +4 | -1

The powdered ore is agitated with water or washed with running steam of water. The heavy ore particles
and lighter impurities are separated. This method of concentration is known a

View answer and explanation

Correct option: C

Gravity separation

Option C (Gravity separation) is correct because gravity separation relies on the difference in densities between the ore particles and the impurities (gangue).

58 Medium

58 of 175

Remembering +4 | -1

Spelter is:

View answer and explanation

Correct option: A

Impure zinc

Option A (Impure zinc) is correct because spelter refers to impure zinc obtained during the metallurgy of zinc.

59 Medium

59 of 175

Remembering +4 | -1

In froth floatation process many chemicals (frother, collector, activator and depressant) are used. Which is called a frother?

View answer and explanation

Correct option: C

Pine oil

The correct answer is C (Pine oil) because pine oil reduces the surface tension of water, allowing for froth formation in the froth floatation process.

60 Medium

60 of 175

Analyzing +4 | -1

Which of the following statements about the advantage of roasting sulphide ore before reduction is true?

a. The

\Delta_{{f}} {G}^{\mathrm{o}}

of the sulphide is greater than that for

{CS}_2

and

{H}_2 {S}

b. The

\Delta {G}

is negative for roasting sulphide ore to oxide.

c. Roasting sulphide to oxide is thermodynamically feasible

d. Carbon and hydrogen are suitable reducing agents for metal sulphides

View answer and explanation

Correct option: B

a, b, and c

The correct answer is a, b, and c. Roasting sulphide ores is advantageous because the change in Gibbs free energy is negative, making it thermodynamically feasible, and the Gibbs free energy of formation of the sulphide is greater than that of CS2 and H2S. Carbon and hydrogen are not suitable reducing agents for metal sulphides.

Revision notes and key takeaways

Review GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS in your textbook or class notes, then use this set to check your understanding.

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