Principles & Isolation of Elements Test

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Principles & Isolation of Elements Test - 9

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Question 1
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One or More than One Options Correct Type

This section contains 5 multiple type questions. Each question has 4 choices (a), (b), (c) and (d), out of which ONE or MORE THAN ONE are correct.?

Q.

The ore that is concentrated by froth floatation process is

A
Cinnabar

B
Galena

C
Zinc blende

D
All are correct

Solution

Cinnabar, Galena , zinc blende are concetrated by froth floatation method.
Question 2
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In froth floatation process the particles of the ore come on the froth because

A
They become water repellent

B
They are light

C
They have lower molecular weight

D
Option A,B are Correct

Solution

They are light and water repellent.
Question 3
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Purification of bauxite is called

A
Baeyer 's process

B
Hall process

C
Serpeck process

D
All are correct

Solution

Hoope 's method is used to obtain aluminium of very high purity. The metal obtained in the Hall-Heroult process is about 99% pure and for most purposes it is taken as pure metal. However further purification of aluminium can be carried out by the Hoope ’s process. This is an electrolytic process.
Question 4
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The common impurities found in bauxite are

A
Fe₂ O₃

B
CaCO₃

C
SiO₂

D
Option A,C are Correct

Solution

The common impurities present in bauxite are Fe₂ O₃ and SiO₂ .
Question 5
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Which of the following chemicals are involved in froth floatation process?

A
Collectors

B
Depressant

C
Activators

D
All are correct

Solution

Flux is not involved in froth floatation process.
Question 6
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Comprehension Type

This section contains a passage describing theory, experiments, data, etc. Two questions related to the paragraph have been given. Each question has only one correct answer out of the given 4 options (a), (b), (c) and (d).

Passage

Most of the ores available in nature contain large amount of impurities i.e. gangue. The pretreatment of ores, based on physical properties and without bringing out any major chemical change in the ore is called ore dressing or ore concentration.

Q. Which of the following is related to ore concentration?

A
Levigation

B
Smelting

C
Zone refining

D
Electrolysis

Solution

The process by which lighter earthly particles are free from the heavier ore particles by washing with water is called levigation.
Question 7
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Most of the ores available in nature contain large amount of impurities i.e. gangue. The pretreatment of ores, based on physical properties and without bringing out any major chemical change in the ore is called ore dressing or ore concentration.

Q.

In the purification of bauxite by leaching, the chemicals employed in Baeyer ’s and Hall ’s process respectively are

A
Na₂ CO₃ and NaOH

B
NaOH and Na₂ CO₃

C
NaOH and C + N₂

D
Na₂ CO₃ and NaCN

Solution

In the Baeyer process Al₂ O₃ is obtained from bauxite ore by treating the powered ore with a strong solution of NaOH when alumina (Al₂ O₃ ) dissolves forming sodium mefa-aluminate leaving behind impurities.
Question 8
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Matching List Type

Choices for the correct combination of elements from Column I and Column II are given as options (a), (b), (c) and (d), out of which one is correct.

Q.

Match the Column I with Column II and mark the correct option from the codes given below.

A

B

C

D

Solution

(i) →(r), (ii) →(p), (iii) →(q), (iv) →(s)
Question 9
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Match the Column I with Column II and mark the correct option from the codes given below.

A
a

B
b

C
c

D
d

Solution

(i) →(q), (ii) →(r,t), (iii) →(p), (iv)→(s)
Question 10
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One Integer Value Correct Type

This section contains 5 questions, when worked out will result in an integer value from 0 to 9 (both inclusive).

Q.

The number of ores concentrated by froth floatation process among cassiterite, galena, zinc blende, chromite, haematite, copper iron pyrites

A
3

B
4

C
5

D
6

Solution

Galena, zinc blende and copper iron pyrites are concentrated by froth floatation method.
Question 11
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The number of ores concentrated by leaching or wet process among calamine, tinstone, bauxite, argentite, horn silver, galena, cinnabar, native gold

A
1

B
2

C
5

D
4

Solution

Bauxite, horn silver, native gold, tinstone.
Question 12
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In the leaching of Ag₂ S with NaCN the equation is

Ag₂ S + 4NaCN →2Na[Ag(CN)₂ ] + Na₂ S. In this change in oxidation state of silver.

A
1

B
0

C
5

D
9

Solution

In this reaction oxidation state of silver is zero.
Question 13
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Number of ores concentrated by Levigation (hydraulic washing) among pitche blende, tinstone, chromite, galena, copper pyrites, argentite.

A
0

B
2

C
3

D
5

Solution

Pitche blende, tinstone, chromite are purified by levigation.
Question 14
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The number of magnetic substances among : tinstone, wolframite, chromite, magnetite, pyrolusite, rutile, magnesite, sphalerite

A
4

B
3

C
5

D
1

Solution

Wolframite, chromite, magnetite, rutile (contain iron impurities).
Question 15
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Statement Type

Direction : This section is based on Statements I and Statements II. Select the correct answer from the codes given below.

Q.

Statement I : Cresol and aniline are froth stabilisers.

Statement II : Collectors enhance the non-wettability of the ore particles.

A
Both Statement I and Statement II are correct and Statement II is the correct explanation of Statement I

B
Both Statement I and Statement II are correct and Statement II is not the correct explanation of Statement I

C
Statement I is correct but Statement li is incorrect

D
Statement II is correct but Statement I is incorrect

Solution

Because cresol and aniline are froth stabilisers, but only ethyl xanthate, pine oil which enhance non-wettability of ore particles.