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General Principles and Processes of Isolation of Elements

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Q 1. In the alumino-thermite process, aluminium acts as

A

an oxidizing agent

B

a flux

a reducing agent

D

a solder

Explanation

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Q 2. Which ore contains both iron and copper?

A

Cuprite

B

Chalcocite

Chalcopyrite

D

Malachite

Explanation

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Q 3. Oxidation states of the metal in the minerals haematite and magnetite, respectively, are

A

II, III in haematite and III in magnetite

B

II, III in haematite and II in magnetite

C

II in haematite and II, III in magnetite

III in haematite and II, III in magnetite

Explanation

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Q 4. Sulfide ores are common for the metals

{tex} \mathrm { Ag } , \mathrm { Cu } {/tex} and {tex} \mathrm { Pb } {/tex}

B

{tex} \mathrm { Ag } , \mathrm { Mg } {/tex} and {tex} \mathrm { Pb } {/tex}

C

{tex} \mathrm { Ag } , \mathrm { Cu } {/tex} and {tex} \mathrm { Sn } {/tex}

D

{tex} \mathrm { Al } , \mathrm { Cu } {/tex} and {tex} \mathrm { Pb } {/tex}

Explanation

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Q 5. Calamine, malachite, magnetite and cryolite, respectively, are

{tex} \mathrm { ZnCO } _ { 3 } , \mathrm { CuCO } _ { 3 } , \mathrm { Cu } ( \mathrm { OH } ) _ { 2 } , \mathrm { Fe } _ { 3 } \mathrm { O } _ { 4 } , \mathrm { Na } _ { 3 } \mathrm { AlF } _ { 6 } {/tex}

B

{tex} \mathrm { ZnSO } _ { 4 } , \mathrm { Cu } ( \mathrm { OH } ) _ { 2 } , \mathrm { Fe } _ { 3 } \mathrm { O } _ { 4 } , \mathrm { Na } _ { 3 } \mathrm { AlF } _ { 6 } {/tex}

C

{tex} \mathrm { ZnSO } _ { 4 } , \mathrm { CuCO } _ { 3 } , \mathrm { Fe } _ { 2 } \mathrm { O } _ { 3 } , \mathrm { AlF } _ { 3 } {/tex}

D

{tex} \mathrm { ZnCO } _ { 3 }, \mathrm { CuCO } _ { 3 } , \mathrm { Fe } _ { 2 } \mathrm { O } _ { 3 } , \mathrm { Na } _ { 3 } \mathrm { AlF } _ { 6 } {/tex}

Explanation

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Q 6.

The fact that impurities are more soluble in the molten state than in the solid state of the metal is used in _________

A

Liquation process

B

Distillation

Fractional crystallization

D

Polling

Explanation

The fact that impurities are more soluble in the molten state than in the solid state of the metal is used in zone refining. Zone refining is also called fractional crystallization

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Q 7.

Oxides of the various metals are converted into metal by heating but not in

A

C

D

All are correct

Explanation

Oxides of the metal are converted into metal if they are above Hg in activity series

No effect

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Q 8.

Roasting is carried out in a/an _______ furnace

A

Blast

Reverberatory

C

Muffle

D

Electric

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Q 9.

Hall’s process is used for purification of __________

A

White bauxite

Red bauxite

C

Iron aluminate

D

Silicates

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Q 10.

can be neutralized by and 1equivalent of will require mole of each in the ratio

A

C

D

Explanation

(1 equivalent) equivalent

equivalent

equivalnet

In terms of moles

1 equivalent 1 mol

1 equivalent

1 equivalent

Thus, molar ratio is

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Q 11.

The slag obtained during the extraction of copper from copper pyrites is composed of

A

B

D

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Q 12.

The chemical process in the production of steel from haematite ore involves

A

Reduction

B

Oxidation

C

Reduction followed by oxidation

Oxidation followed by reduction

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Q 13.

Calamine is ________

A

B

C

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Q 14.

Consider the following redox reactions,

The values of and in the reaction are, respectively

5, 2 and 16

B

2, 5 and 8

C

2, 5 and 16

D

5, 2 and 8

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Q 15.

When is passed into hot aqueous solution of

A

is formed by reduction

B

is formed by oxidation

C

is evolved

All of the above are correct

Explanation

By reduction by oxidation

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Q 16.

Pig tin is obtained by _________

Liquation process

B

Zone refining

C

Polling

D

Vapour phase refining

Explanation

Liquation process is the refining method used to obtain pure tin metal. The pure tin metal obtained by this method is called pig tin

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Q 17.

In the leaching of with , a stream of air is also passed. It is because of

A

Reversible nature of reaction between and

B

To oxide formed into and sulphur

Both (a) and (b)

D

None of the above

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Q 18.

Blister Cu is about

A

60% Cu

B

90% Cu

98% Cu

D

100% Cu

Explanation

After bessemerisation of the concentrated ore, Cu obtained is 98% pure, it is called blister Cu

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Q 19.

Select the correct statement(s) about differentiation floatation

A

It is used to concentrate mixture of sulphides at different stages

B

Zinc sulphate is used to depress zinc sulphide and forms froth

C

Copper sulphate is used to activate depressed lead sulphide and is blown to make froth

All of the above are correct statements

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Q 20.

Select some statements about metallurgical extraction of Al

I. Cryolite and fluorspar are added to molten alumina

II. Aqueous solution of salts cannot be taken as electrolyte

III. Molten can be taken instead by molten alumina

IV. Hall’s process is adopted for the beneficiation of low grade red beauxite

Select the correct statements

All except III

B

All except II

C

I and II only

D

I and IV only

Explanation

I (fluorspar) and (cryolite) reduce melting point of the mixture improves electrical conductivity of the melting as compared to molten

II. Aqueous solution of cannot be taken since gas is formed in preference to Al

III. Molten being covalent is poor conductor. It sublimes at melting point. Hence, cannot be taken

IV. Hall’s process is adopted for the extraction of Al from bauxite

Thus, III incorrect

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Q 21.

Cementite is

A

Predominant content of cement

B

A mineral of calcium

A carbide of iron in steel

D

None of the above

Explanation

Cementite

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Q 22.

In the Pidgeon process, Mg is produced by

A

Electrolysis of fused

Reducing calcined dolomite with ferrosilicon at high temperature under pressure

C

Both (a) and (b)

D

None of the above

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Q 23.

Which process is NOT involved in extraction of Zn?

A

Roasting

B

Smelting

C

Refining

Polling

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Q 24.

In the oxidation of by which species does not appear in final ionic reaction?

Ferric

B

Oxalate

C

Permanganate

D

All of these

Explanation

is reduced to is oxidized to

is not affected, hence does not appear in net ionic reaction

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Q 25.

Roasted copper pyrites on smelting with sand produces _________

as fusible slag and matte

B

as infusible slag and matte

C

as fusible slag and matte

D

as infusible slag and matte

Explanation

During smelting of roasted copper pyrites, ferrous oxide is produced which combines with silica (flux) to form fusible slag

Ferrous Silica Ferrous silicate

Oxide (Flux) (Fusible slag)

The molten material obtained after roasting and smelting of copper ore from the blast furnace consists of sulphides of , coke and sand which is called matte