Principles & Isolation of Elements Test

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Principles & Isolation of Elements Test - 7

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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. Which of the following is the correct combination?

A
Borax = Na₂ B₄ O₇ . 5H₂ O

B
Colemanite = Ca₂ Br₆ O₁₁ . 5H₂ O

C
Anglesite = PbCO₃

D
Chile saltpeter = NaNO₃

Solution

Sodium nitrate is the chemical compound with the formula NaNO₃ . This alkali metal nitrate salt is also known as Chile saltpeter (large deposits of which were historically mined in Chile ) to distinguish it from ordinary saltpeter , potassium nitrate . The mineral form is also known as nitratine, nitratite or soda niter.
Question 2
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Which of the following is the correct combination?

A
Calamine, siderite

B
Magnesite , dolomite

C
Malachite , azurite

D
All are correct

Solution

Calamine (ZnCO₃ ), Siderite (FeCO₃ ), Malachite (CuCO₃ . Cu(OH)₂ ), Calcite (CaCO₃ ), Azurite (2CuCO₃ . Cu(OH)₂ ), Witherite (BaCO₃ ). MAGNESITE IS MgCO3 and DOLOMITE is CaCO3.MgCO3.
Question 3
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Which is not the name of a mineral?

A
Gypsum

B
Plaster of Paris

C
Litharge

D
Galena

Solution

Plaster of Paris is not a mineral. It is a building material made by heating gypsum, a mineral, to remove its water content. The other three options (Gypsum, Litharge, and Galena) are indeed minerals.
Question 4
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Which of the following is a halide ore?

A
cryolite

B
Sylvine

C
Carnallite

D
All are correct

Solution

Feldspar = KAISi₃ O₈ , Cryolite (3NaF.AlF₃ or Na₃ AlF₆ ).
Sylvine= KCI, Carnallite = KCI.MgCI₂ . 6H₂ O
Question 5
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Which is not an example of ore?

A
Ruby silver

B
German Silver

C
Quick Silver

D
Option B,C are Correct

Solution

Ruby silver = Pyrargyrite(3Ag₂ S.Sb₂ S₃ or Ag₃ SbS₃ ),
Horn silver = AgCI
German silver = An alloy of Cu + Zn + Ni and Quick silver = Mercury.
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

The natural substances in which metals occur in the earth are called minerals. A mineral has a definite composition. It may be a single compound or a complex mixture . It is usually associated with number of impurities. The minerals from which the metals can be conveniently extracted are called ores .Thus, all ores are minerals but all minerals are not ores. Depending on the composition ores are classified into different types such as oxides, sulphides, carbonates, halides, silicates etc.

Q. The impurities associated with minerals are called.

A
Gangue

B
Flux

C
Slag

D
Depressant

Solution

The correct answer is option A
The impurities associated with minerals used in metallurgy are collectively called Gangue.
Question 7
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The natural substances in which metals occur in the earth are called minerals. A mineral has a definite composition. It may be a single compound or a complex mixture . It is usually associated with number of impurities. The minerals from which the metals can be conveniently extracted are called ores .Thus, all ores are minerals but all minerals are not ores. Depending on the composition ores are classified into different types such as oxides, sulphides, carbonates, halides, silicates etc.

Q.

Metals that exist in their native state are

A
Cu and Fe

B
Al and Cu

C
Au and Pt

D
Pd and Pt

Solution

Elements which are not attached by moisture, oxygen and carbon dioxide of the air occur in the native state, e.g. Au, Pt, and noble gases.
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 options from the codes given below

A

B

C

D

Solution

(i) →(t), (ii) →(s), (iii) →(q), (iv) →(p)
Question 9
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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) →(s), (iii) →(p), (iv) →(q,t)
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 carbonate minerals among the following

Cassiterite , Siderite , Anglesite , Azurite , Calamine , Cryolite ,Calcite ,Magnetite, Magnesite

A
5

B
4

C
3

D
2

Solution

The carbonate ores are siderite, azurite. calamine, calcite, magnesite.
Question 11
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The different number of non-metals present in fluorapatite are

A
1

B
2

C
3

D
4

Solution

Fluorapatite is 3Ca₃ (PO₄ )₂ . CaF₂ or Ca₉ (PO₄ )6CaF₂ .
Question 12
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Number of oxide ores among Galena, Pyrolusite, Rutile, Cinnabar, Cassiterite, Haematite, Sphalerite, Salt petre, Cuprite

A
4

B
5

C
3

D
1

Solution

The oxide ores are pyrolusite, rutile, cassiterite, haematite and cuprite.
Question 13
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How many of the given mineral contain silicon in them? Pyrargyrite (Ruby silver), Kaolinite (China clay) .Feldspar, Willemite, Limonite, Mica, Beryl

A
0

B
1

C
2

D
5

Solution

Silicon is present in Beryl = 3 BeO . AI₂ O₃ . 6SiO₂ ;
Mica = K₂ O . 3AI₂ O₃ . 6SiO₂ . 2H₂ O
Zn₂ SiO₄ = Willemite; Feldspar = KAISi₃ O₈ .
China clay = Al₂ O₃ . 2SiO₂ . 2H₂ O (or) [AI₂ (OH)₄ Si₂ O₅ ]
Silicon is not present in
Limonite = 2Fe₂ O₃ . 3H₂ O; Pyrargyrite (Ruby silver)
= 3Ag₂ S₃ Sb₂ S₃ .
Question 14
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Number of ores that have more than one metal or non-metal among: Horn silver, Quick silver, Chromite, Limonite, Cinnabar, Cryolite, Caliche, Diaspore, Fluorspar

A
5

B
3

C
1

D
4

Solution

Chromite (Fe₂ CrO₄ ), Limonite (Fe₂ O₃ . 3H₂ O), Cryolite
(Na₃ AIF₆ ), Caliche (NalO₃ ), Diaspora (Al₂ O₃ . H₂ O).
Question 15
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Statement Type

This section is based on Statement I and Statement II. Select the correct anser from the codes given below .

Q.

Statement I : The copper pyrite (CuFeS₂ ) is the ore of copper.

Statement II : The clay (Al₂ O₃ . 2SiO₂ . 2H₂ O) is the ore of aluminium.

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 but Statement II is not the correct explanation of Statement I

C
Statement I is correct but Statement II is incorrect

D
Statement II is correct but Statement I is incorrect

Solution

Aluminium cannot be extracted from clay profitably.