General Principles and Processes of Isolation of Elements Test

Result

General Principles and Processes of Isolation of Elements Test - 12

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

In the combined state, zinc is mainly found as :

A
chloride

B
bromide

C
oxide

D
sulphide

Solution

The most common ore of zinc is zinc blend or zinc sulfide. Zinc sulfide is main form of zinc found in nature.
Question 2
1 / -0

Matrix is defined as:

A
the unwanted foreign material present in the ore

B
the flux added to remove the unwanted impurities from ore

C
the slag formed as a result of the reaction of flux with gangue

D
the material used in the reduction of metal oxide to metal

Solution

The ore that exists inside our earth contains dust, stone, quartz and other foreign materials. The impurities are called gangue or matrix in the ore. During the concentration process, care is taken to remove the matrix from the ore.
Question 3
1 / -0

In electrolytic refining of any metal impure metal is taken as ...............

A
anode

B
cathode

C
solution

D
both B and C

Solution

In electrolytic refining, impure metal is of positive charged anode and pure metal is of negative charged cathode.
Question 4
1 / -0

Concentration by froth floatation is applicable for which of the following ores?

A
$$Al_{2}O_{3}$$

B
$$Te_{3}O_{4}$$

C
$$Te_{2}O_{3}.3H_{2}O$$

D
$$ZnS$$

Solution

This method is used for those metals whose ore gets preferably wetted by the oil and the gangue by the water. The sulphide ores preferably wetted by the oil and the gangue with the water.
Question 5
1 / -0

Alumina thermite process involves reduction of chromium(II) oxide with ..................... .

A
copper

B
zinc

C
iron

D
aluminium

Solution

Aluminium is used in thermite process as it has high boiling point, low cost and more reactivity than many of the d-block metals. Oxidizers used are boron(III) oxide, chromium(III) oxide, iron(II,III) oxide and copper(II) oxide.
Question 6
1 / -0

In thermite process, the reducing agent is:

A
C

B
Al

C
Na

D
Mg
Solution
Hint: The thermite process is widely used for repairing railway tracks, by reduction of iron oxide to generate iron. This reduction is carried out by $$Al$$ powder.

Explanation:
The thermite process is the reaction of aluminum with iron oxide which forms elemental iron along with aluminum oxide.
In thermite reaction, $$Al$$ is the reducing agent.
As $$Al$$ is converting to $$Al_2O_3$$ so the oxidation state of $$Al$$ changes from $$0$$ to $$+3$$ in $$Al_2O_3$$ so it is the loss of electron that means oxidation takes place.
$$ Al \rightarrow Al^{3+} + 3 e^-$$
As a Reducing agent is the one that reduces itself that is why $$Al$$ acts as a reducing agent.
This reaction generates tremendous amounts of heat, which results in the melting of the railway tracks which are made of iron.
This can be used to repair and join the broken railway tracks.
Final answer: Option $$B$$
Question 7
1 / -0

Which of the method used for the concentration of sulfide ores?

A
froth floatation

B
smelting

C
magnetic separation

D
gravity separation

Solution

This method is used for those metals whose ore gets preferably wetted by the oil and the gangue by the water. The sulphide ores preferably wetted by the oil and the gangue with the water.
Question 8
1 / -0

In thermite welding, to ignite the mixture we use :

A
magnesium ribbon

B
potassium ribbon

C
calcium ribbon

D
manganese ribbon

Solution

Thermite welding also known as exothermic welding and the reaction of metal oxide and aluminium powder reaches very high temperature. The activation energy for this reaction is very high and the initiation requires the use of a booster material such as powder magnesium metal.
Question 9
1 / -0

The process used in purifying metals by electrolysis is called:

A
electroplating

B
electrometallurgy

C
electrorefining

D
electro-deposition

Solution

The process used in purifying metals by electrolysis is called electro-refining.
Question 10
1 / -0

In the extraction of some metals from their ores, coke can be used as:

A
Oxidizing agent

B
Reducing agent

C
Catalyst

D
Flux

Solution

Metals below carbon in the reactivity series can be extracted using carbon. Carbon reduces the metal oxides that are extracted when heated.

For example, the common ores of iron are both iron oxides, and these can be reduced to iron by heating them with carbon in the form of coke.

Hence, option B is correct.

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 - 12

Result

General Principles and Processes of Isolation of Elements Test - 12

Score

-

Rank

-

SHARING IS CARING

Question 1

chloride

bromide

oxide

sulphide

Solution

Question 2

the unwanted foreign material present in the ore

the flux added to remove the unwanted impurities from ore

the slag formed as a result of the reaction of flux with gangue

the material used in the reduction of metal oxide to metal

Solution

Question 3

anode

cathode

solution

both B and C

Solution

Question 4

$$Al_{2}O_{3}$$

$$Te_{3}O_{4}$$

$$Te_{2}O_{3}.3H_{2}O$$

$$ZnS$$

Solution

Question 5

copper

zinc

iron

aluminium

Solution

Question 6

C

Al

Na

Mg

Solution

Question 7

froth floatation

smelting

magnetic separation

gravity separation

Solution

Question 8

magnesium ribbon

potassium ribbon

calcium ribbon

manganese ribbon

Solution

Question 9

electroplating

electrometallurgy

electrorefining

electro-deposition

Solution

Question 10

Oxidizing agent

Reducing agent

Catalyst

Flux

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.