General Principles and Processes of Isolation of Elements Test

Result

General Principles and Processes of Isolation of Elements Test - 33

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
1 / -0

Which of the following methods is used for obtaining metals of very high purity?

A
Distillation

B
Zone refining

C
Liquation

D
Electrolytic refining

Solution

Zone melting or zone refining is a method of purifying crystals in which a narrow region of crystal is molten and this molten zone is moved along the crystal. The molten region melts impure solid at its front edge and leaves a wake of pure metal solidified behind it. This method is used to prepare high purity materials mainly semiconductors for transistors.
Question 2
1 / -0

Which statement is true?

A
Aluminium is the most abundant metal in the earth's crust.

B
Oxygen is the most abundant non-metal in the earth's crust.

C
Ammonia $$(NH_3)$$ and methane $$(CH_4)$$ are covalent hydrides.

D
All of these.

Solution

$$\Rightarrow$$ Aluminium and Silicon, both are most abundant elements on Earth's crust, while oxygen is a non metal which is most abundant on Earth's crust.
$$\Rightarrow NH_3$$ (Ammonia) and $$CH_4$$ (Methane) are covalent hydrides as electronegativity difference is less between atoms and both are $$sp^3$$ hybridized. So, All are correct.
Question 3
1 / -0

Which of the following methods is based on the principle of the difference in the wetting properties of the ore and gangue particles with water and oil?

A
Magnetic separation

B
Froth floatation process

C
Hydraulic washing

D
None of these

Solution

Principle involved in the froth floatation method is the difference in the wetting properties of the ore and the gangue particles. The sulphide ore particles are preferentially wetted by oil while gangue particles are preferentially wetted by water.
Question 4
1 / -0

RCC is:

A
the concrete having an iron framework inside it as a support

B
the crushed cement in which more gravel is added

C
prepared by adding calcium chloride to the limestone and calcium silicate

D
none of the above

Solution

RCC is Reinforced concrete cement. It is a combination of concrete and steel to build a structure instead of using only concrete. Concrete is good in resisting compression and to gain resisting tension steel is added which has high tensile strength. To overcome the drawback of concrete, reinforced steel bars are used along with concrete.
Question 5
1 / -0

Liquation is used to refine:

A
iron

B
tin

C
copper

D
gold

Solution

As tin has low melting point, it is made to flow on a sloppy surface to separate it from high melting point impurities. So, it is extracted by liquidation.
Question 6
1 / -0

Which of these is obtained by electrolytic reduction of its compound?

A
$$Cu$$

B
$$Au$$

C
$$Mg$$

D
$$Bi$$

Solution

Electrolytic reduction is done for more electropositive elements like Mg, Na, Al, Ca. These elements are extracted from their oxides, hydroxide and chlorides in fused state.

Among the given elements only Mg is extracted by electrolytic reduction process.
Thus option C is correct.
Question 7
1 / -0

Aluminium is extracted by :

A
Heating sodium aluminium silicate to a high temperature

B
Treating cryolite with sodium hydroxide solution under pressure

C
Heating aluminium oxide with coke in a furnace

D
The electrolysis of molten aluminium oxide in fused cryolite

Solution

Aluminium is extracted by electrolysis. The ore is first converted into pure aluminium oxide by the Bayer Process and this is then electrolysed in solution in molten cryolite another aluminium compound. The aluminium oxide has too high a melting point to electrolyse on its own. The usual aluminium ore is bauxite.
Question 8
1 / -0

The most abundant metal on the earth is:

A
iron

B
gold

C
aluminium

D
copper

Solution

Aluminium is the most abundant element in the earth's crust. It is most abundant in terms of quantity.
Question 9
1 / -0

Which of the following metals exist in their native state in nature?

A
Cu and Au

B
Au and Zu

C
Au and Ag

D
Ag and Cu

Solution

Precious metals gold and silver are rare and chemically tend to be less reactive than other metals so they occur freely in nature.
Question 10
1 / -0

A metal obtained by auto reduction or self reduction _______________.

A
Na

B
Zn

C
Fe

D
Cu

Solution

The principle ore of copper is copper pyrite and copper is extracted from this ore. During this process no external reducing agent is used so it is an example of self reduction.

Self-reduction happens in Bessemer converter reaction as

$$2FeS+ 3O_2 \rightarrow 2FeO+ 2SO_2$$

$$Cu_2O+ FeS \rightarrow Cu_2S + FeO$$

$$FeO + SiO_2 \rightarrow FeSiO_3$$ (removed as slag)

$$2Cu_2S+ 3O_2 \rightarrow 2Cu_2O + SO_2$$

self reduction:
$$Cu_2S + 2Cu_2O \rightarrow 6Cu + SO_2$$

self-reduction takes place in the case of Copper.

User

Question Analysis

Correct -
Wrong -
Skipped -

My Perfomance

Score
-
out of -
Rank
-
out of -

Re-Attempt Weekly Quiz Competition

General Principles and Processes of Isolation of Elements Test - 33

Result

General Principles and Processes of Isolation of Elements Test - 33

Score

-

Rank

-

SHARING IS CARING

Question 1

Distillation

Zone refining

Liquation

Electrolytic refining

Solution

Question 2

Aluminium is the most abundant metal in the earth's crust.

Oxygen is the most abundant non-metal in the earth's crust.

Ammonia $$(NH_3)$$ and methane $$(CH_4)$$ are covalent hydrides.

All of these.

Solution

Question 3

Magnetic separation

Froth floatation process

Hydraulic washing

None of these

Solution

Question 4

the concrete having an iron framework inside it as a support

the crushed cement in which more gravel is added

prepared by adding calcium chloride to the limestone and calcium silicate

none of the above

Solution

Question 5

iron

tin

copper

gold

Solution

Question 6

$$Cu$$

$$Au$$

$$Mg$$

$$Bi$$

Solution

Question 7

Heating sodium aluminium silicate to a high temperature

Treating cryolite with sodium hydroxide solution under pressure

Heating aluminium oxide with coke in a furnace

The electrolysis of molten aluminium oxide in fused cryolite

Solution

Question 8

iron

gold

aluminium

copper

Solution

Question 9

Cu and Au

Au and Zu

Au and Ag

Ag and Cu

Solution

Question 10

Na

Zn

Fe

Cu

Solution

User

Question Analysis

My Perfomance

Score

-

Rank

-

Results Announcement on: coming Monday

Stay Tuned: We’ll update you on your result via email or SMS.