General Principles and Processes of Isolation of Elements Test

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General Principles and Processes of Isolation of Elements Test - 28

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Question 1
1 / -0

The constituents of the electrolyte for the extraction of aluminium is ____________.

A
40 parts cryolite + 40 parts fluorspar + 20 parts pure $$Al_2O_3$$

B
60 parts cryolite + 30 parts fluorspar + 10 parts pure $$Al_2O_3$$

C
30 parts cryolite + 30 parts fluorspar + 40 parts pure $$Al_2O_3$$

D
60 parts cryolite + 20 parts fluorspar + 20 parts pure $$Al_2O_3$$

Solution

Pure alumina melts at about $$2000^oC$$ and is a bad conductor of electricity. If fused cryoliteand fluorspar is added, the mixture melts at $$900^oC$$ and $$Al_2O_3$$ becomes a good conductorof electricity.
Electrolyte: 60 parts cryolite + 20 parts fluorspar + 20 parts pure $$Al_2O_3$$
Question 2
1 / -0

In the froth floatation process, for the beneficiation of ores, the ore particles float because ______________.

A
they are light

B
their surface is not easily wetted by water

C
they bear electrostatic charge

D
they are insoluble

Solution

In the froth floatation process, for the benefaction of ores, the ore particles float because their surface is not easily wetted by water. This method is base on the difference in the wetting properties of ores and gangue particles with the water and oil.
Question 3
1 / -0

Complete the statement given below pertaining to metallurgy by filling the blank with the correct word.

Aluminium is an important constituent metal in duralumin since it is __________ .

A
good conductor of heat

B
unaffected by food acids

C
light

D
bright

Solution

duralumin is an alloy made up of aluminium, magnesium, manganese and copper. It is used in making light tools and aircraft. Aluminium is an important constituent metal in duralumin since it is unaffected by food acids.
Question 4
1 / -0

Aluminium powder a constituent of paints, prevents:

A
conduction of electric current

B
formation of rust

C
heat radiation

D
heat generation

Solution

The aluminium pigment present in paint is primarily responsible for colour and hiding power but it plays an important role for the physical properties of the film. In anti-corrosion primers the aluminium have inhibitive or rust preventing properties. In top paints, the aluminium are flake-like particles in order to increase the oxygen diffusion path.
Question 5
1 / -0

Zone-refining has been employed for preparing ultra-pure samples of:

A
Cu

B
Zn

C
Ge

D
Ag

Solution

Zone Refining or Fractional Crystallisation is employed to get metal of very high purity i,e. ultra pure samples of Ge Si, B, Ga, In. This method is based on the fact that impurities are more soluble than the pure metal in the melt.
Question 6
1 / -0

Which of the following metal is sometimes found native in nature?

A
Aluminium

B
Copper

C
Sodium

D
Magnesium

Solution

Copper is an unreactive metal and it reacts slowly with the atmosphere. The huge lumps of copper metal are found buried in the ground as nuggets. This is called native copper.
Question 7
1 / -0

When $$FeCr_2O_4$$ (chromite) is reduced with $$Al$$:

A
$$Cr$$ and $$Fe_2O_3$$, are formed

B
$$Fe$$ and $$Cr_2O_3$$ are formed

C
$$Fe$$ and $$Cr$$ (ferrochrome) are formed

D
$$FeCrO_4$$. is formed

Solution

For the production of ferrochrome ($$Fe$$ and $$Cr$$), the chromite ore ($$Fe{ Cr }_{ 2 }{ O }_{ 4 }$$) is reduced with either aluminium or silicon in an aluminothermic reaction.
Question 8
1 / -0

In zone-refining method, the molten zone:

A
consists of impurities only

B
contains more impurity than the original metal

C
contains the purified metal only

D
moves to either side

Solution

Zone-refining process is a group of similar methods of purifying crystals, in which a narrow region of a crystal is melted, and this molten zone is moved along the crystal. The molten region melts impure solid at its forward edge and leaves a wake of purer material solidified behind it as it moves through the ingot. It typically contains more impurity than the original metal.
Question 9
1 / -0

In which of the following isolations is no reducing agent required?

A
Iron from haematire

B
Tin from tin oxide

C
Mercury from cinnabar

D
Zine from zinc blende

Solution

Cinnabar ore is relatively concentrated, it can be processed directly without any intermediate steps to remove waste material and without requirement of a reducing agent.
Question 10
1 / -0

The ore that is concentrated by froth floatation process is ___________.

A
cinnabar

B
bauxite

C
malachite

D
zineite

Solution

Ores which are concentrated by froth floatation process include Galena ($$PbS$$), zinc blende ($$ ZnS$$) and cinnabar ($$ HgS$$).

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General Principles and Processes of Isolation of Elements Test - 28

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General Principles and Processes of Isolation of Elements Test - 28

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Question 1

40 parts cryolite + 40 parts fluorspar + 20 parts pure $$Al_2O_3$$

60 parts cryolite + 30 parts fluorspar + 10 parts pure $$Al_2O_3$$

30 parts cryolite + 30 parts fluorspar + 40 parts pure $$Al_2O_3$$

60 parts cryolite + 20 parts fluorspar + 20 parts pure $$Al_2O_3$$

Solution

Question 2

they are light

their surface is not easily wetted by water

they bear electrostatic charge

they are insoluble

Solution

Question 3

good conductor of heat

unaffected by food acids

light

bright

Solution

duralumin is an alloy made up of aluminium, magnesium, manganese and copper. It is used in making light tools and aircraft. Aluminium is an important constituent metal in duralumin since it is unaffected by food acids.

Question 4

conduction of electric current

formation of rust

heat radiation

heat generation

Solution

Question 5

Cu

Zn

Ge

Ag

Solution

Question 6

Aluminium

Copper

Sodium

Magnesium

Solution

Question 7

$$Cr$$ and $$Fe_2O_3$$, are formed

$$Fe$$ and $$Cr_2O_3$$ are formed

$$Fe$$ and $$Cr$$ (ferrochrome) are formed

$$FeCrO_4$$. is formed

Solution

Question 8

consists of impurities only

contains more impurity than the original metal

contains the purified metal only

moves to either side

Solution

Question 9

Iron from haematire

Tin from tin oxide

Mercury from cinnabar

Zine from zinc blende

Solution

Question 10

cinnabar

bauxite

malachite

zineite

Solution

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