General Principles and Processes of Isolation of Elements Test

Result

General Principles and Processes of Isolation of Elements Test - 34

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

Sequence the following steps involved generally in the extraction of a metal in pure form from its ore.
(a) The metal obtained from its oxide require further purification for end use.
(b) The ore should be converted to its oxide form.
(c) The ore is beneficial to us if it is handpicked then metal crushed and ground, and later subjected to pulverization as per the requirement
(d) The ore in the form of oxide is required to be reduced.
(e) Dressed ore is required for it to be concentrated.

A
e c b d a

B
c e b d a

C
c e b a d

D
c e d b a

Solution

(c) The ore is beneficial to us if it is handpicked then metal crushed and ground, and later subjected to pulverization as per the requirement
(e) Dressed ore is required for it to be concentrated.
(b) The ore should be converted to its oxide form.
(d) The ore in the form of oxide is required to be reduced.
(a) The metal obtained from its oxide require further purification for end use.
Question 2
1 / -0

In the electrolytic reduction of alumina, the electrolyte is covered with coke powder because, if :

A
prevents oxidation of aluminium formed

B
reacts with aluminium forming aluminium carbide

C
prevents heat loss from electrolyte

D
None of the above

Solution

The electrolyte is a molten bath of cryolite and dissolved alumina. Cryolite is a good solvent for alumina with low melting point. The molten electrolyte is maintained at high temperature inside the insulating cell by using high amount of coke powder or dust to prevent the heat loss.
Question 3
1 / -0

A mixture of sand and salt can be separated by:

A
Sublimation

B
Sieving

C
Dissolving salt and sand mixture in water and then filtration

D
Dissolving salt in water and then distillation

Solution

Dissolving salt in water and then distillation
Process to separate sand and salt from the mixture :
Step 1: Add water to the mixture and stir until the salt dissolve.
Step 2: Turn your burner on and then keep the mixture over it.
Step 3: Pour the water mixture through a very fine strainer or cheese cloth filter . (Sand will remain in filter, salt and water will pass through it)
Step 4: Pour the water and salt mixture back into the burner . And allow the water to boil away and collect salt from there.
Question 4
1 / -0

Which of the following method is used for extracting metals from ores?

A
Reduction

B
Melting

C
Electrolysis

D
Both $$A$$ and $$C$$

Solution

The compounds of reactive metals from which metals extracted and purified are called ores of metals. Metals can be extracted from ore by reduction and electrolysis.
Question 5
1 / -0

What is electrolysis$$?$$

A
Decomposition of substance by passing electricity

B
Decomposition of substance by heating

C
Decomposition of substance by redox reaction

D
Addition of hydrogen

Solution

Electrolysis is the process of decomposition of a substance by passing electricity through it in a molten or dissolved state.
For example, Electrolysis of fused magnesium chloride gives magnesium at cathode and chlorine at the anode.

Hence, the correct option is $$A$$
Question 6
1 / -0

Prior to reduction, metal sulphide and carbonates are converted into oxides because:

A
carbonates, sulphides are heavy molecules

B
it is easier to obtain a metal from its oxide as compared to its sulphides and carbonates

C
it is easy to heat oxide compared to sulphides and carbonates

D
both $$A$$ and $$B$$

Solution

It is easier to obtain a metal from its oxide, as compared to its sulphides and carbonates. Therefore, prior to reduction, the metal sulphides and carbonates must be converted to metal oxides.
Question 7
1 / -0

What is concentration of ore?

A
Increasing the concentration of metal

B
Reducing the concentration of metal

C
Reducing hydrogen ions

D
Both $$A$$ and $$C$$

Solution

Different processes applied in order to increase the percentage of metal in the ore is called concentration of ore.
Question 8
1 / -0

_________ is the removal of oxygen for extraction of metal from ore.

A
Reduction

B
Electrolysis

C
Oxidation

D
Distillation

Solution

Reduction is the process of removal of oxygen for extraction of metals from their oxide ores.
Question 9
1 / -0

Ores contain a large amount of impurities, which is called as:

A
ore

B
gangue

C
dust

D
particulate

Solution

Ores contain large amount of impurities, which is called as gangue. The process of removing of impurities by physical means of methods like hand picking, crushing or pulverizing and grinding) is called dressing of ore.
Question 10
1 / -0

Which of the following statement is not correct about Ellingham diagram?

A
$$\Delta G$$ increases with an increase in temperature

B
It consists of plots of $$\Delta_{f}G^{\circ}$$ vs $$T$$ for formation of oxides

C
A coupling reaction can be well expressed by this diagram

D
It express the kinetics of the reduction process

Solution

$$\longrightarrow$$Ellingham diagram is a plot between $$\triangle_fG^o$$ and $$T$$ for the formation of oxides of metals. A general reaction expressing oxidation is given by
$$2xM(s) +O_2(g)\longrightarrow 2MxO(s)$$

$$\longrightarrow$$Except for the process in which change of phase takes place, each plot is a straight line. This temperature at which change of phase takes place is indicated by a positive increase in the slope.

$$\longrightarrow$$The metal oxide is stable at the point in a curve below which $$\triangle G$$ is negative. Above this point, the metal oxide is unstable and decomposes on its own.

$$\longrightarrow$$ Feasibility of reductions of the oxide of the upper line by the element represented by the lower line is determined by the difference in the two $$\triangle rG^o$$ values after the point of intersection in the Ellingham diagram.

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 - 34

Result

General Principles and Processes of Isolation of Elements Test - 34

Score

-

Rank

-

SHARING IS CARING

Question 1

e c b d a

c e b d a

c e b a d

c e d b a

Solution

Question 2

prevents oxidation of aluminium formed

reacts with aluminium forming aluminium carbide

prevents heat loss from electrolyte

None of the above

Solution

Question 3

Sublimation

Sieving

Dissolving salt and sand mixture in water and then filtration

Dissolving salt in water and then distillation

Solution

Question 4

Reduction

Melting

Electrolysis

Both $$A$$ and $$C$$

Solution

Question 5

Decomposition of substance by passing electricity

Decomposition of substance by heating

Decomposition of substance by redox reaction

Addition of hydrogen

Solution

Question 6

carbonates, sulphides are heavy molecules

it is easier to obtain a metal from its oxide as compared to its sulphides and carbonates

it is easy to heat oxide compared to sulphides and carbonates

both $$A$$ and $$B$$

Solution

Question 7

Increasing the concentration of metal

Reducing the concentration of metal

Reducing hydrogen ions

Both $$A$$ and $$C$$

Solution

Question 8

Reduction

Electrolysis

Oxidation

Distillation

Solution

Question 9

ore

gangue

dust

particulate

Solution

Question 10

$$\Delta G$$ increases with an increase in temperature

It consists of plots of $$\Delta_{f}G^{\circ}$$ vs $$T$$ for formation of oxides

A coupling reaction can be well expressed by this diagram

It express the kinetics of the reduction process

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.