General Principles and Processes of Isolation of Elements NEET Questions

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General Principles and Processes of Isolation NEET Practice Questions

1 / 34

List the method used for extracting sodium from halide ores like sodium chloride (NaCl).

a) Pyro metallurgy

d) Magnetic separation

b) Hydrometallurgy

c) Electrometallurgy

2 / 34

Out of the given options, which of the following ore is used to extract silver?

b) Cinnabar

d) Malachite

a) Calamine

c) Argentite

3 / 34

By electromagnetic separation, where are magnetic particles collected in concentration?

d) Above the magnetic roller

a) Away from the magnetic roller

b) On the conveyor belt

c) Below the magnetic roller

4 / 34

By electromagnetic separation, where are magnetic particles collected in concentration?

d) Above the magnetic roller

c) Below the magnetic roller

a) Away from the magnetic roller

b) On the conveyor belt

5 / 34

The name of the metallurgical process in which the ore is leached and the metal is extracted using electrolysis:

d) Thermite process

b) Hydrometallurgy

a) Zone refining

c) Liquation

6 / 34

The method of zone refining of metals is based on the principle of

d) Greater solubility of the impurity in the molten state than in the solid.

b) Higher m.pt. of the impurity as that of the pure metal.

a) Greater mobility of pure metal than that of impurity.

c) The greater noble character of the solid metal than that of the impurity

7 / 34

In froth flotation, what role does the revolving paddle play?

a) Enhances wettability of gangue particles

d)Enhances non-wettability of the ore particles

c) Draws in the air causing frothing

b) Stabilizes the froth

8 / 34

Which of the following metals are not removed by Electrolysis?

a) Na

c) Al

b) Mg

d) Fe

9 / 34

Extraction of zinc from zinc blende is achieved by

Roasting followed by self-reduction

Roasting followed by reduction with another metal

Electrolytic reduction

Roasting followed by reduction with carbon

10 / 34

Cassiterite is the ore of which metal?

11 / 34

Cassiterite is an ore of

(d) Sn

(a) Sb

(b) Ni

12 / 34

The ore particles float in the Froth floatation process for beneficiation of the ores because

a) they are light

c) they bear electrostatic charge

d) they are insoluble.

b) their surface is not easily wetted by water

13 / 34

Which of the following is not a suitable ore for extracting iron?

c) Siderite

a) Hematite

d) Iron Pyrites

b) Magnetite

14 / 34

The purest form of iron is:

steel

wrought iron

pig iron

cast iron

15 / 34

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

Fe and Ni

Ag and Au

Pb and Zn

Sn and Ag

16 / 34

In the equation,

4M + 8CN^– + H₂O + O₂ → 4[M(CN)₂]^– + 4OH^–, the metal M is

Zinc

gold

copper

iron

17 / 34

Roasting of sulfides gives the gas X as a byproduct. This is a colorless gas with a choking smell of burnt sulfur 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 X is

(a) CO₂

(b) SO₃

(d) SO₂

18 / 34

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?

(b) Copper pyrite

(a) Galena

(d) Argentite

19 / 34

Which of the following is an illustration of metallurgical electrochemical principles?

c) Bergius process

b) Solvay process

d) Hall-Heroult process

a) Baeyer’s process

20 / 34

Electrolytic reduction of Al2O3 to Al by the Hall-Herault process is carried out

d) in presence of cryolite which forms a melt with a high melting point.

a) in presence of NaCl.

b) in presence of fluorite.

c) in presence of cryolite which forms a melt with a lower melting point.

21 / 34

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

(d) iron (II) sulphide

(a) carbon monoxide

(b) copper (I) sulphide

22 / 34

The method of zone refining of metals is based upon the principle of

greater noble character of solid metal than that of the impurity

higher melting point of impurity than that of pure metal.

greater solubility of the impurity in molten state than in solid

greater mobility of pure metal than impurity

23 / 34

Oxides are formed when food is roasted. What is the necessity to roast oxide ores?

a) To avoid gangue particles

c) To remove the volatile impurities that are present in the form of their oxides

d) To make the ore porous

b) To get crude metal by using an oxidizing agent

24 / 34

Which one is malachite from the following?

(d) Fe₃O₄

(b) CuFeS₂

(a) CuCO₃.Cu(OH)₂

25 / 34

In the extraction of copper from sulphide ore, the metal is formed by reduction of Cu₂O with

Cu₂S

FeS

SO₂

26 / 34

Why during the leaching of Ag₂S with NaCN, a stream of air is also passed?

c) to oxidize Ag₂S to Ag₂O.

a) As the reaction between Ag₂S and NaCN is reversible.

d) Both (a) and (b).

b) to oxidize Na₂S formed in the reaction to Na₂SO₄.

27 / 34

In the electrolytic method of obtaining aluminum from purified bauxite, cryolite is added to the charge in order to:

protect aluminium produced from oxygen

minimise the heat loss due to radiation

lower the melting point of bauxite

dissolve bauxite and render it a conductor of electricity

28 / 34

Which of the cases is best for hand-picking concentration?

c) When either the ore or the impurities are magnetic

b) When the impurities can be distinguished from the ore with the help of the naked eye

d) When the ore particles are heavier than the impurities

a) When the ores are a good conductor of electricity

29 / 34

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

(b) Zn

(a) Fe

(d) Cu

30 / 34

Identify the incorrect statement

(b) Minerals are naturally occurring chemical substances in the earth’s crust.

(d) Gangue is an ore contaminated with undesired materials.

(a) The scientific and technological process used for the isolation of the metal from its ore is known as metallurgy.

31 / 34

An additional substance is added which combines with impurities to form a fusible mass during the process of smelting. The additional substance is called

d) Ore

a) Flux

c) Gangue

b) Slag

32 / 34

Heating ore with carbon in the absence of air is known as:

carbon-reduction

smelting

Roasting

reduction

33 / 34

In electrorefining of copper some gold is produced as:

anode mud

cathode deposit

cathode mud

anode deposit

34 / 34

Which one of the following is a mineral of iron?

(d) Magnetite

(b) Cassiterite

(a) Malachite

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