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Explore popular questions from General Principles and Processes of Isolation of Elements for NEET. This collection covers General Principles and Processes of Isolation of Elements previous year NEET questions hand picked by experienced teachers.

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General Principles and Processes of Isolation of Elements

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Q 1. Match items of Column I with the items of Column II and assign the correct code:

Column I Column II
(A)Cyanide process (i)Ultrapure {tex}\mathrm {Ge}{/tex}
(B)Froth floatation process (ii)Dressing of {tex}\mathrm {ZnS}{/tex}
(C)Electrolytic reduction (iii)Extraction of {tex}\mathrm {Al}{/tex}
(D)Zone refining (iv)Extraction of {tex}\mathrm {Au}{/tex}
(v)Purification of {tex}\mathrm {Ni}{/tex}

A

{tex} \mathrm {{A}- {(i)}, {B} - {(ii)}, {C} - {(iii)}, D-{(iv)}}{/tex}

B

{tex} \mathrm {{A}- {(iii)}, {B} - {(iv)}, {C} - {(v)}, D-{(i)}}{/tex}

{tex} \mathrm {{A}- {(iv)}, {B} - {(ii)}, {C} - {(iii)}, D-{(i)}}{/tex}

D

{tex} \mathrm {{A}- {(ii)}, {B} - {(iii)}, {C} - {(i)}, D-{(v)}}{/tex}

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Q 2. In the extraction of copper from its sulphide ore, the metal is finally obtained by the reduction of cuprous oxide with

A

carbon monoxide

copper (I) sulphide

C

sulphur dioxide

D

iron(II) sulphide.

Explanation

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Q 3. "Metals are usually not found as nitrates in their ores." Out of the following two (I and II) reasons which is/are true for the above observation?
{tex}\mathrm I{/tex}. Metal nitrates are highly unstable.
{tex}\mathrm {II}{/tex}. Metal nitrates are highly soluble in water.

I is false but II is true

B

I is true but II is false.

C

I and II are true.

D

I and II are false

Explanation

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Q 4. The metal oxide which cannot be reduced to metal by carbon is

{tex} \mathrm { Al } _ { 2 } \mathrm { O } _ { 3 } {/tex}

B

{tex} \mathrm { PbO } {/tex}

C

{tex} \mathrm{ZnO}{/tex}

D

{tex} \mathrm { Fe } _ { 2 } \mathrm { O } _ { 3 } {/tex}

Explanation

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Q 5. Which one of the following is a mineral of iron?

A

Malachite

B

Cassiterite

C

Pyrolusite

Magnetite

Explanation

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Q 6. Which of the following elements is present as the impurity to the maximum extent in the pig iron?

A

Manganese

Carbon

C

Silicon

D

Phosphorus

Explanation

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Q 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.

A

{tex} \mathrm { Fe } _ { 2 } \mathrm { O } _ { 3 ( s ) } + 3 \mathrm { CO } _ { ( \mathrm { g } ) } \rightarrow 2 \mathrm { Fe } _ { ( l ) } + 3 \mathrm { CO } _ { 2 ( \mathrm { g } ) } {/tex}

B

{tex} \mathrm { CaCO } _ { 3 ( \mathrm { s } ) } \rightarrow \mathrm { CaO } _ { ( \mathrm { s } ) } + \mathrm { CO } _ { 2 ( \mathrm { g } ) } {/tex}

{tex} \mathrm { CaO } _ { ( \mathrm { s } ) } + \mathrm { SiO } _ { 2 ( \mathrm { s } ) } \rightarrow \mathrm { CaSiO } _ { 3 ( \mathrm { s } ) } {/tex}

D

{tex} 2 \mathrm { C } _ { ( s ) } + \mathrm { O } _ { 2 ( \mathrm { g } ) } \rightarrow 2 \mathrm { CO } _ { ( \mathrm { g } ) } {/tex}

Explanation

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Q 8. Sulphide ores of metals are usually concentrated by froth floatation process. Which one of the following sulphide ores offer an exception and is concentrated by chemical leaching?

A

Galena

B

Copper pyrite

C

Sphalerite

Argentite

Explanation



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Q 9. Which of the following statements, about the advantage of roasting of sulphide ore before reduction is not true?

A

The {tex} \Delta G _ { f } ^ { \circ } {/tex} of the sulphide is greater than those for {tex} \mathrm { CS } _ { 2 } {/tex} and {tex} \mathrm { H } _ { 2 } \mathrm { S } {/tex} .

B

The {tex} \Delta G _ { f } ^ { \circ} {/tex} is negative for roasting of sulphide ore to oxide.

C

Roasting of the sulphide to the oxide is thermodynamically feasible.

Carbon and hydrogen are suitable reducing agents for metal sulphides.

Explanation

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Q 10. Cassiterite is an ore of

A

{tex} \mathrm { Sb } {/tex}

B

{tex} \mathrm { Ni} {/tex}

C

{tex} \mathrm { Mn } {/tex}

{tex} \mathrm { Sn } {/tex}

Explanation

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Q 11. 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?

A

Metal sulphides are thermodynamically more stable than {tex} \mathrm { CS } _ { 2 } {/tex}

B

{tex} \mathrm { CO } _ { 2 } {/tex} is thermodynamically more stable than {tex} \mathrm { CS } _ { 2 } {/tex}

C

Metal sulphides are less stable than the corresponding oxides

{tex} \mathrm { CO } _ { 2 } {/tex} is more volatile than {tex} \mathrm { CS } _ { 2 } {/tex}

Explanation

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Q 12. Which of the following reaction takes place in blast furnace during extraction of copper?

A

{tex} 2 \mathrm { Cu } _ { 2 } \mathrm { S } + 3 \mathrm { O } _ { 2 } \longrightarrow 2 \mathrm { Cu } _ { 2 } \mathrm { O } + 2 \mathrm { SO } _ { 2 } {/tex}

B

{tex} 2 \mathrm { FeS } + 3 \mathrm { O } _ { 2 } \longrightarrow 2 \mathrm { FeO } + 2 \mathrm { SO } _ { 2 } {/tex}

C

{tex} 2 \mathrm { Cu } _ { 2 } \mathrm { O } + \mathrm { Cu } _ { 2 } \mathrm { S } \longrightarrow 6 \mathrm { Cu } + \mathrm { SO } _ { 2 } {/tex}

All of these

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Q 13. Which of the following elements is present as the impurity to the maximum extent in the pig iron?

A

Manganese

Carbon

C

Silicon

D

Phosphorus

Explanation

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Q 14. Extraction of gold and silver involves leaching with {tex} \mathrm { CN } ^ { - } {/tex} ion. Silver is later recovered by

A

distillation

B

zone refining

displacement with {tex} \mathrm { Zn } {/tex}

D

liquation

Explanation



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Q 15. Roasting of sulphides gives the gas {tex}X{/tex} as a byproduct. This is a colourless gas with choking smell of burnt sulphur and causes great damage to respiratory organs as a result of acid rain. Its aqueous solution is acidic, acts as a reducing agent and its acid has never been isolated.
The gas {tex} X {/tex} is

A

{tex} \mathrm { CO } _ { 2 } {/tex}

B

{tex} \mathrm { SO } _ { 3 } {/tex}

C

{tex} \mathrm { H } _ { 2 } \mathrm { S } {/tex}

{tex} \mathrm { SO } _ { 2 } {/tex}

Explanation


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Q 16. Aluminium is extracted from alumina{tex} \left( \mathrm { Al } _ { 2 } \mathrm { O } _ { 3 } \right) {/tex} by electrolysis of a molten mixture of

A

{tex} \mathrm { Al } _ { 2 } \mathrm { O } _ { 3 } + \mathrm { HF } + \mathrm { NaAlF } _ { 4 } {/tex}

B

{tex} \mathrm { Al } _ { 2 } \mathrm { O } _ { 3 } + \mathrm { CaF } _ { 2 } + \mathrm { NaAlF } _ { 4 } {/tex}

{tex} \mathrm { Al } _ { 2 } \mathrm { O } _ { 3 } + \mathrm { Na } _ { 3 } \mathrm { AlF } _ { 6 } + \mathrm { CaF } _ { 2 } {/tex}

D

{tex} \mathrm { Al } _ { 2 } \mathrm { O } _ { 3 } + \mathrm { KF } + \mathrm { Na } _ { 3 } \mathrm { AlF } _ { 6 } {/tex}

Explanation

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Q 17. Which of the following pairs of metals is purified by van Arkel method?

A

Ga and In

Zr and Ti

C

Ag and Au

D

Ni and Fe

Explanation

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Q 18. The method of zone refining of metals is based on the principle of

A

greater mobility of the pure metal than that of the impurity

B

higher melting point of the impurity than that of the pure metal

C

greater noble character of the solid metal than that of the impurity

greater solubility of the impurity in the molten state than in the solid

Explanation

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Q 19. Purification of aluminium, by electrolytic refining, is known as

Hoope's process

B

Bayer's process

C

Hall's process

D

Serpeck's process

Explanation

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Q 20. Calcium is obtained by

A

reduction of calcium chloride with carbon

electrolysis of molten anhydrous calcium chloride

C

roasting of limestone

D

electrolysis of solution of calcium chloride in {tex} \mathrm { H } _ { 2 } \mathrm { O } {/tex}

Explanation

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Q 21. Bronze is a mixture of

A

{tex} \mathrm { Pb } + \mathrm { Sn } {/tex}

{tex} \mathrm { Cu } + \mathrm { Sn } {/tex}

C

{tex} \mathrm { Cu } + \mathrm { Zn } {/tex}

D

{tex} \mathrm { Pb } + \mathrm { Zn } {/tex}

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Q 22. Which of the following pair is incorrectly matched?

A

Magnetite - {tex} \mathrm { Fe } _ { 3 } \mathrm { O } _ { 4 } {/tex}

B

Copper glance - {tex}\mathrm { Cu } _ { 2 } \mathrm { S } {/tex}

C

Calamine - {tex}\mathrm { ZnCO } _ { 3 } {/tex}

Zincite - {tex}\mathrm {ZnS}{/tex}

Explanation

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Q 23. Aluminothermic process is used for the extraction of metals, whose oxides are

A

fusible

not easily reduced by carbon

C

not easily reduced by hydrogen

D

strongly basic.

Explanation

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Q 24. Which reagent is used in Bayer's process?

A

{tex} \mathrm { Na } _ { 2 } \mathrm { CO } _ { 3 } {/tex}

B

Carbon

{tex} \mathrm { NaOH } {/tex}

D

Silica

Explanation

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Q 25. When an aqueous solution of sodium chloride is electrolysed using platinum electrodes, the ion discharged at the electrodes are

A

sodium and hydrogen

B

sodium and chloride

hydrogen and chloride

D

hydroxyl and chloride

Explanation