JEE Main > General Principles and Processes of Isolation of Elements

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Q 1.    

Correct4

Incorrect-1

Aluminium is extracted by the electrolysis of

A

bauxite

B

alumina

alumina mixed with molten cryolite

D

molten cryolite.

Explanation


Q 2.    

Correct4

Incorrect-1

The metal extracted by leaching with a cyanide is

A

{tex} \mathrm { Mg } {/tex}

{tex} \mathrm { Ag } {/tex}

C

{tex} \mathrm { Cu } {/tex}

D

{tex} \mathrm { Na } {/tex}

Explanation



Q 3.    

Correct4

Incorrect-1

Which one of the following ores is best concentrated by froth-flotation method?

A

Galena

B

Cassiterite

Magnetite

D

Malachite

Explanation


Q 4.    

Correct4

Incorrect-1

During the process of electrolytic refining of copper, some metals present as impurity settle as 'anode mud'. These are

A

Fe and Ni

Ag and Au

C

Pb and Zn

D

Sn and Ag

Explanation

Q 5.    

Correct4

Incorrect-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?

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}

Metal sulphides are less stable than the corresponding oxides

D

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

Explanation




Q 6.    

Correct4

Incorrect-1

{tex}29.5 \mathrm { mg } {/tex} of an organic compound containing nitrogen was digested according to Kjeldahl's method and the evolved ammonia was absorbed in {tex}20 \mathrm { mL } {/tex} of {tex}0.1 \mathrm { M \ HCl } {/tex} solution. The
excess of the acid required {tex}15 \mathrm { mL } {/tex} of {tex}0.1 \mathrm { M \ } \mathrm { NaOH } {/tex} solution for complete neutralization. The percentage of nitrogen in the compound is

A

59

B

47.4

23.7

D

29.5

Explanation





Q 7.    

Correct4

Incorrect-1

Which method of purification is represented by the following equation?
{tex} \mathrm { Ti } ( \mathrm { s } ) + 2 \mathrm { I } _ { 2 } ( \mathrm { g } ) \stackrel { 523 \mathrm { K } } { \longrightarrow } \mathrm { TiI } _ { 4 } ( \mathrm { g } ) \stackrel { 1700 \mathrm { K } } { \longrightarrow } \mathrm { Ti } ( \mathrm { s } ) + 2 \mathrm { I } _ { 2 } ( \mathrm { g } ) {/tex}

A

Zone refining

B

Cupellation

C

Polling

Van Arkel

Explanation

Q 8.    

Correct4

Incorrect-1

The metal that cannot be obtained by electrolysis of an aqueous solution of its salts is:

A

{tex} \mathrm { Ag } {/tex}

{tex} \mathrm { Ca } {/tex}

C

{tex} \mathrm { Cu } {/tex}

D

{tex} \mathrm { Cr } {/tex}

Explanation



Q 9.    

Correct4

Incorrect-1

In the context of the Hall-Heroult process for the extraction of Al, which of the following statements is false?

A

{tex} \mathrm { Al } ^ { 3 + } {/tex} is reduced at the cathode to form Al

{tex} \mathrm { Na } _ { 3 } \mathrm { AlF } _ { 6 } {/tex} serves as the electrolyte

C

{tex} \mathrm { CO } {/tex} and {tex} \mathrm { CO } _ { 2 } {/tex} are produced in this process

D

{tex} \mathrm { Al } _ { 2 } \mathrm { O } _ { 3 } {/tex} is mixed with CaF {tex} _ { 2 } {/tex} which lowers the melting point of the mixture and brings conductivit 112{tex} \mathrm { y } {/tex}

Explanation

Q 10.    

Correct4

Incorrect-1

Which one of the following ores is best concentrated by froth floatation method?

Galena

B

Malachite

C

Magnetite

D

Siderite

Explanation



Q 11.    

Correct4

Incorrect-1

Aluminium is extracted by the electrolysis of

A

bauxite

B

alumina

alumina mixed with molten cryolite

D

molten cryolite.

Explanation


Q 12.    

Correct4

Incorrect-1

The metal extracted by leaching with a cyanide is

A

{tex} \mathrm { Mg } {/tex}

{tex} \mathrm { Ag } {/tex}

C

{tex} \mathrm { Cu } {/tex}

D

{tex} \mathrm { Na } {/tex}

Explanation


Q 13.    

Correct4

Incorrect-1

Cyanide process is used for the extraction of

A

barium

B

aluminium

C

boron

silver

Explanation


Q 14.    

Correct4

Incorrect-1

When the sample of copper wth zinc impurity is to be purified by electrolysis, the appropriate electrodes are in pair of cathode : anode

A

pure zinc {tex} : {/tex} pure copper

B

impure sample : pure copper

C

impure zinc {tex} : {/tex} impure sample

pure copper {tex} : {/tex} impure sample.

Explanation


Q 15.    

Correct4

Incorrect-1

Which one of the following ores is best concentrated by froth-flotation method?

A

Magnetite

B

Cassiterite

Galena

D

Malachite.

Explanation


Q 16.    

Correct4

Incorrect-1

During the process of electrolytic refining of copper, some metals present as impurity settle as 'anode mud'. These are

A

Sn and Ag

B

Pb and Zn

Ag and Au

D

Fe and Ni

Explanation


Q 17.    

Correct4

Incorrect-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?

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

B

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

C

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

D

Metal sulphides are less stable than the corresponding oxides

Explanation


Q 18.    

Correct4

Incorrect-1

The chemical composition of slag formed during the extraction of copper is

A

{tex} \mathrm { Cu } _ { 2 } \mathrm { O } {/tex}

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

C

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

D

{tex} \mathrm { Cu } _ { 2 } \mathrm { S } + \mathrm { FeO } {/tex}

Explanation

Q 19.    

Correct4

Incorrect-1

Zinc blende is concentrated by

A

Electromagnetic process

B

Calcination process

C

Distillation

Froth floatation process

Explanation

Q 20.    

Correct4

Incorrect-1

Which of the following metal cannot be obtained by electrolysis of the aqueous solution of its salt?

A

{tex} \mathrm { Ag } {/tex}

B

{tex} \mathrm { Au } {/tex}

C

{tex} \mathrm { Cu } {/tex}

{tex} \mathrm { Mg } {/tex}

Explanation

Q 21.    

Correct4

Incorrect-1

Purest form of iron is

A

Cast iron

B

Hard iron

C

Stainless steel

Wrought iron

Explanation

Q 22.    

Correct4

Incorrect-1

The metal oxide which cannot be reduced to metal by carbon is

A

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

B

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

C

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

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

Explanation

Q 23.    

Correct4

Incorrect-1

On heating a mixture of {tex} \mathrm { Cu } _ { 2 } \mathrm { O } {/tex} and {tex} \mathrm { Cu } _ { 2 } \mathrm { S } {/tex}, we get

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

B

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

C

{tex} \mathrm { CuO } + \mathrm { CuS } {/tex}

D

{tex} \mathrm { Cu } _ { 2 } \mathrm { SO } _ { 3 } {/tex}

Explanation

Q 24.    

Correct4

Incorrect-1

Out of following which metal can be purified by Van Arkel method?

A

{tex}\mathrm {Ti} {/tex}

B

{tex}\mathrm{Z r} {/tex}

C

{tex} \mathrm { Hf } {/tex}

All of these

Explanation

Q 25.    

Correct4

Incorrect-1

Froth floatation process is based on

A

Specific gravity of the ore particles

B

Magnetic properties of the ore particles

Wetting properties of the ore particles

D

Electrical properties of the ore particles

Explanation