General Principles and Processes of Isolation of Elements Test

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General Principles and Processes of Isolation of Elements Test - 13

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Weekly Quiz Competition

Question 1
1 / -0

Sketch shown is of an electrolytic cell used in the extraction of aluminium:

What is the substance of which the electrode A is made?

A
Graphite

B
Diamond

C
Iron

D
Aluminium

Solution

The diagram shows an aluminium oxide electrolysis cell. Both the negative electrode (cathode) and positive electrode (anode) are made of graphite, a form of carbon.
Question 2
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The composition of thermite mixture is

A
Iron (III) oxide and aluminium powder in the ratio 1 : 3.

B
Aluminium powder and iron (III) oxide in the ration 1 : 3.

C
Aluminium powder and barium peroxide in the ratio 1 : 3.

D
Barium peroxide and aluminium in the ratio 1 : 3.

Solution

Thermite mixture is 1 : 3 ratio of Al powder and ferric oxide.
Question 3
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Directions For Questions

A to F below relate to the source and extraction of either Zinc or Aluminium.
A: Bauxite, B: Coke, C: Cryolite, D: Froth floatation, E: Sodium hydroxide solution, F: Zinc blende.

...view full instructions

Which one is make a conducting solution?

A
Pure aluminium oxide

B
Coke

C
Cryolite

D
All of these

Solution

Pure alumina melts at about $$2000^oC$$ and is a bad conductor of electricity. If fused cryolite and fluorspar is added, the mixture melts at $$900^oC$$ and $$Al_2O_3$$ becomes a good conductor of electricity.
Question 4
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Sulphur molecule exists as :

A
$$S_2$$

B
$$S$$

C
$$S_6$$

D
$$S_8$$

Solution

Sulphur molecule exists as $$S_8$$.
Question 5
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The following question is relevant to the extraction of Aluminium:
Along with cryolite and alumina, another substance is added to the electrolyte mixture. the substance is ___________.

A
Fluorspar

B
Mica

C
NaCl

D
None of these

Solution

Fluorspar is the substance act as a solvent and it increases conductivity. (Pure alumina melts at about $$2000^oC$$ and is a bad conductor of electricity. If fused cryolite and fluorspar is added, the mixture melts at $$900^oC$$ and $$Al_2O_3$$ becomes a good conductor of electricity.)
Question 6
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In the upper region of blast furnace the gas helps in the reduction of iron oxide to iron is:

A
carbon dioxide

B
carbon monoxide

C
hydrogen

D
oxygen

Solution

The hot carbon monoxide is the reducing agent for the iron ore and reacts with the iron oxide to produce molten iron and carbon dioxide. Depending on the temperature in the different parts of the furnace (warmest at the bottom) the iron is reduced in several steps.

Hence, the correct option is $$(B)$$
Question 7
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A compound added to lower the fusion temperature of the electrolytic bath in the extraction of Al is ___________.

A
cryolite and fluorspar

B
Bauxite

C
Iron and fluorspar

D
none of these

Solution

Pure alumina melts at about $$2000^oC$$ and is a bad conductor of electricity. If fused cryolite and fluorspar is added, the mixture melts at $$900^0C$$ and $$Al_2O_3$$ becomes a good conductor of electricity.
Question 8
1 / -0

Transmission wires are made of aluminium, since aluminium is:

A
Corrosive

B
Resistant

C
Good conductor of electricity

D
Good conductor of heat

Solution

Al is an active metal so its a good conductor of electricity and used in making of transmission wires.
Question 9
1 / -0

If impurities can be oxidized more easily than the metal itself, which method is used?

A
Liquation method

B
Distillation method

C
Oxidation method

D
None of these

Solution

Oxidation process refers to a set of chemical treatment procedures designed to remove organic and inorganic materials in water and waste water by oxidation through reactions by hydroxyl ions.
Oxidation method is used when impurities are easily oxidisable. For example, lead as an impurity in silver is removed by heating, the impurity is easily oxidised to $$PbO$$ and removed by air.
Question 10
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Which metal is used for making foils used in packing of food materials?

A
Copper

B
Platinum

C
Aluminium

D
Sodium

Solution

Aluminium foils are used for preserving the food material and used as packaging material as it does not react with the food.It is white,soft and ductile metal. Aluminium is almost always alloyed which improves its mechanical properties when tempered.

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General Principles and Processes of Isolation of Elements Test - 13

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General Principles and Processes of Isolation of Elements Test - 13

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Question 1

Graphite

Diamond

Iron

Aluminium

Solution

Question 2

Iron (III) oxide and aluminium powder in the ratio 1 : 3.

Aluminium powder and iron (III) oxide in the ration 1 : 3.

Aluminium powder and barium peroxide in the ratio 1 : 3.

Barium peroxide and aluminium in the ratio 1 : 3.

Solution

Question 3

Pure aluminium oxide

Coke

Cryolite

All of these

Solution

Question 4

$$S_2$$

$$S$$

$$S_6$$

$$S_8$$

Solution

Question 5

Fluorspar

Mica

NaCl

None of these

Solution

Question 6

carbon dioxide

carbon monoxide

hydrogen

oxygen

Solution

Question 7

cryolite and fluorspar

Bauxite

Iron and fluorspar

none of these

Solution

Question 8

Corrosive

Resistant

Good conductor of electricity

Good conductor of heat

Solution

Question 9

Liquation method

Distillation method

Oxidation method

None of these

Solution

Question 10

Copper

Platinum

Aluminium

Sodium

Solution

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