General Principles and Processes of Isolation of Elements Test

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General Principles and Processes of Isolation of Elements Test - 32

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Question 1
1 / -0

$$\displaystyle Fe_{2}O_{3\left ( s \right )}+2Al_{\left ( s \right )}\rightarrow 2Fe_{\left ( l \right )}+Al_{2}O_{3\left ( s \right )}$$
The above reaction is known as _________ and it is highly ________ .

A
electrolysis, endothermic

B
refining, endothermic

C
calcination, exothermic

D
thermite reaction, exothermic

Solution

Thermite is a pyrotechnic composition of metal powder, fuel and metal oxide. When ignited by heat, thermite undergoes an exothermic reduction-oxidation reaction. Fuels include $$Al,\ Mg, \ Ti, \ Zn, \ Si,\ B$$ and $$Al$$ is common because of its high boiling point and low cost. Oxidizers include boron (III) oxide, iron (III) oxide, copper (II) oxide.
Question 2
1 / -0

The diagram shows the sketch of an electrolytic cell used in the extraction of aluminium. What is the substance of which the electrodes A and B are made?

A
Carbon and graphite

B
Zinc and copper

C
Copper and iron

D
None of the above

Solution

The diagram shows an aluminium oxide electrolysis cell. Both the negative electrode (cathode) and the positive electrode (anode) are made of graphite, which is a form of carbon.

Hence, option A is correct.
Question 3
1 / -0

In the alumino thermic process, aluminium acts as:

A
an oxidizing agent

B
a flux

C
a reducing agent

D
a solder

Solution

In the alumino thermic process, aluminium acts as a reducing agent.
Question 4
1 / -0

Which of the following methods is used in purification of mercury?

A
Liquation

B
Distillation

C
Electrolytic refining

D
Chemical reduction

Solution

Liquation:
This method is used for the refining of metals having low melting point and are associated with high melting impurities, e.g., $$Pb, Sn, Sb, Bi$$.
Distillation:
Metals having low boiling point are refined by this method. For example, zinc, cadmium and mercury.
Electrorefining of Metals:
Metals such as $$Cu, Ag, Zn, Sn, Pb, Al, Ni, Cr$$ are refined by this method.
Question 5
1 / -0

Liquation method is used for the purification of which of the following metals?

A
Tin

B
Lead

C
Bismuth

D
All of these

Solution

Liquation is used for the refining of metals having low melting point and are associated with high melting impurities. For example, $$Pb,\ Sn,\ Sb,\ Bi$$ and $$Hg$$. The impure metal is heated on the sloping hearth of a furnace. The pure metal flows down leaving behind the non-fusible material on the hearth.
Question 6
1 / -0

Which one of the following metals is used as foil in wrapping cigarettes and confectionery?

A
Silver

B
Steel

C
Aluminium

D
Copper

Solution

Aluminium metal is used as foil in wrapping cigarettes and confectionery.
So answer is C.
Question 7
1 / -0

Which of the following minerals occur naturally mainly in combined form?
1. Aluminium
2. Gold
3. Calcium
4. Sodium

A
1, 2 and 3 only

B
1 and 3 only

C
2 and 4 only

D
1, 3 and 4

Solution

Elements which are reactive are usually present in combined form. Whereas metals which are inert are found in the native state. In the given options, gold is only inert metal.
Hence, option D is correct.
Question 8
1 / -0

Removal of impurities from ore is known as:

A
Crushing

B
Concentration of ore

C
Washing

D
Grinding

Solution

The impurities present in the ore is known as gangue. The removal of impurities from the ore is known as concentartion of ore.
Question 9
1 / -0

In thermite process reducing agent used is:

A
$$C$$

B
$$CO$$

C
$$Al$$

D
none of these

Solution

The Thermite Process or Goldschmidt Process is the method of obtaining liquid metal by reduction of the oxide with aluminium powder, when ignited with magnesium ribbon it reacts by producing iron and aluminium oxide at an intensely high temperature approaching $$3000 \ ^o C$$.
Question 10
1 / -0

Any physical and chemical process by which low grade ores are concentrated, is __________.

A
froth flotation

B
crushing and then screening

C
hand picking

D
washing in zigs

Solution

Froth flotation is a process for selectively separating hydrophobic materials from hydrophilic. Any physical and chemical process by which low grade ores are concentrated is called froth flotation.

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General Principles and Processes of Isolation of Elements Test - 32

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General Principles and Processes of Isolation of Elements Test - 32

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Question 1

electrolysis, endothermic

refining, endothermic

calcination, exothermic

thermite reaction, exothermic

Solution

Question 2

Carbon and graphite

Zinc and copper

Copper and iron

None of the above

Solution

Question 3

an oxidizing agent

a flux

a reducing agent

a solder

Solution

Question 4

Liquation

Distillation

Electrolytic refining

Chemical reduction

Solution

Question 5

Tin

Lead

Bismuth

All of these

Solution

Question 6

Silver

Steel

Aluminium

Copper

Solution

Question 7

1, 2 and 3 only

1 and 3 only

2 and 4 only

1, 3 and 4

Solution

Question 8

Crushing

Concentration of ore

Washing

Grinding

Solution

Question 9

$$C$$

$$CO$$

$$Al$$

none of these

Solution

Question 10

froth flotation

crushing and then screening

hand picking

washing in zigs

Solution

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