General Principles and Processes of Isolation of Elements Test

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General Principles and Processes of Isolation of Elements Test - 49

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following metals exist in their native state in nature?
(i) $$Cu$$
(ii)$$Au$$
(iii)$$Zn$$
(iv)$$Ag$$

A
(i) and (ii)

B
(ii) and (iii)

C
(ii) and (iv)

D
(iii) and (iv)

Solution

Hint: Metals with the least chemical reactivity exist in their native state.

Step 1:
Metals that are placed at the bottom of the reactivity series do not undergo chemical reaction under normal conditions and are inert. This is because those metals' valence electrons are not easily available for chemical reactions.

Step 2:
Metals like gold, silver, platinum, etc. are placed at the bottom of the reactivity series because of their inertness to the chemical reactions. So, they are generally found in their native state in nature. Reactive metals are generally found in combined states as compounds.

Step 3:
Among the given elements, copper and zinc are found in a combined state because of their comparatively higher reactivity but gold (Au) and silver (Ag) are found in their native state.

Final step: So, the correct option is (C) (ii) and (iv).
Question 2
1 / -0

Highly electropositive metal (s) can not be commercially extracted by carbon reduction process at high temperature because these :

A
metal combine with carbon to form covalent carbide

B
metal combine with carbon to form ionic carbide

C
$$ G_{f} $$ of highly electropositive metal oxide is having low negative value

D
Consider the following reaction at $$ 1000^{0} C $$

Solution

As they are highly electropositive metals, high purity metal is obtained at cathode. They are not extracted through carbon reduction because they aren't reduced. It they are reduced also, They have impurities.
The metal combines with carbon to form ionic carbide
Question 3
1 / -0

A mineral is usually associated with a large amount of unwanted material called :

A
Gangue

B
Flux

C
Slag

D
Ore

Solution

A mineral is usually associated with a large amount of unwanted material called Gangue.
Hence, Option "A" is the correct answer.
Question 4
1 / -0

Which one of the following elements is most abundant is earth crust ?

A
Aluminium

B
Silicon

C
Carbon

D
Oxygen

Solution

Oxygen is the most abundant element in the earth's crust.
Hence, Option "D" is the correct answer.
Question 5
1 / -0

Froth floatation process is used for the concentration of the ore of :

A
Fe

B
A1

C
Cr

D
Cu

Solution

Froth floatation process is used for the concentration of the ore of Cu.
Hence, Option "D" is the correct answer.
Question 6
1 / -0

Which one of the following types of metals is expected to occur in the native state ?

A
The alkali metals

B
The alkaline earth metal

C
The noble metal

D
The rare earth metals

Solution

Noble metals are expected to occur in native state because of their low reactivity with other elements.
Hence, Option "C" is the correct answer.
Question 7
1 / -0

Froth floatation process for the concentration of sulphide ores is an illustration of the practical application of :

A
adsorption

B
absorption

C
sedimentation

D
coagulation

Solution
Question 8
1 / -0

Cinnabar is the ore of :

A
Zn

B
Cd

C
Hg

D
Ag

Solution

Cinnabar is HgS.
Hence, Option "C" is the correct answer.
Question 9
1 / -0

Copper is extracted from sulphide ore using the method :

A
carbon reduction

B
carbon monoxide reduction

C
auto reduction

D
none of this

Solution

Copper is extracted from sulphide ore using the method auto reduction.
Hence, Option "C" is the correct answer.
Question 10
1 / -0

In the alumino-thermite process, Al metal acts as :

A
Oxidizing agent

B
Reducing agent

C
Flux

D
Gangue

Solution

In the alumino-thermite process, Al metal acts as a Reducing agent.
Hence, Option "B" is the correct answer.

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Re-Attempt Weekly Quiz Competition

General Principles and Processes of Isolation of Elements Test - 49

Result

General Principles and Processes of Isolation of Elements Test - 49

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SHARING IS CARING

Question 1

(i) and (ii)

(ii) and (iii)

(ii) and (iv)

(iii) and (iv)

Solution

Question 2

metal combine with carbon to form covalent carbide

metal combine with carbon to form ionic carbide

$$ G_{f} $$ of highly electropositive metal oxide is having low negative value

Consider the following reaction at $$ 1000^{0} C $$

Solution

Question 3

Gangue

Flux

Slag

Ore

Solution

Question 4

Aluminium

Silicon

Carbon

Oxygen

Solution

Question 5

Fe

A1

Cr

Cu

Solution

Question 6

The alkali metals

The alkaline earth metal

The noble metal

The rare earth metals

Solution

Question 7

adsorption

absorption

sedimentation

coagulation

Solution

Question 8

Zn

Cd

Hg

Ag

Solution

Question 9

carbon reduction

carbon monoxide reduction

auto reduction

none of this

Solution

Question 10

Oxidizing agent

Reducing agent

Flux

Gangue

Solution

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