Principles & Isolation of Elements Test

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Principles & Isolation of Elements Test - 6

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Weekly Quiz Competition

Question 1
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Only One Option Correct Type
This section contains 10 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE is correct
Q.
Which represents the correct abundance order of elements in the earth crust?

A
O >Si >Fe >Al

B
O >Si >AI >Fe

C
O >C >Si >AI

D
AI >Fe >0 >Si

Solution

The mass-abundance of the nine most abundant elements in the Earth 's crust is approximately: oxygen 46%, silicon 28%, aluminum 8.3%, iron 5.6%, calcium 4.2%, sodium 2.5%, magnesium 2.4%, potassium 2.0%, and titanium 0.61%.
Question 2
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Which of the following contains both copper and iron?

A
Cuprite

B
Chalcocite

C
Chalcopyrite

D
Malachite

Solution

Chalcopyrite (CuFeS2) is the ore which contains both copper and iron.
Question 3
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Regarding cryolite incorrect statement is

A
It is an ore of Al

B
The non-metal is fluorine

C
It is used in aluminium extraction from bauxite

D
Its formula is 3NaF. AIF₃

Solution

Cryolite is an important ore of aluminum that is used in the extraction of aluminum from bauxite. It is a rare mineral that occurs in small quantities in Greenland, and its chemical formula is Na3AlF6.
Question 4
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In chromite ore, the oxidation number iron and chromium are respectively ______.

A
+3, + 6

B
+3, + 2

C
+2, + 3

D
+2, + 6

Solution

In chromite ore is (FeO . Cr₂ O₃ )
Let the oxidation state of Fe be x.
∴ x - 2 + 2 x 3 + 3 x (-2) = 0
x - 2 + 6 - 6 = 0 ⇒x = + 2
Let the oxidation state of Cr be y
∴2 y + 2 - 2 + 3 x (-2 ) = 0
2 y - 6 = 0
y = 3
Hence, oxidation state of Fe and Cr are +2 and +3 respectively.
Question 5
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Sulphide ores are common for metals

A
Ag, Cu and Pb

B
Ag, Cu and Sn

C
Ag, Mg and Pb

D
Al, Cu and Pb

Solution

Metals having high polarising power (Z_eff ) exist in ore with anions having high polarisibility
Ag, Cu, Pb →Sulphide ores (Ag₂ S, CuFeS₂ , Pbs)
Sn →Oxide ore (SnO₂ )
Mg →Sea water and dolomite (CaCO₃ , MgCO₃ )
Al →Oxide ore (Al₂ O₃ .2H₂ O)
Question 6
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Oxidation states of the metal in the minerals haematite and magnetite respectively are

A
II, III in haematite and III in magnetite

B
II, III in haematite and II in magnetite

C
II in haematite and II, III in magnetite

D
Ill in haematite and II, III in magnetite

Solution

Haematite is Fe₂ O₃ , in which oxidation number of iron is III. Magnetite is Fe₃ O₄ which is infact a mixed oxide (FeO.Fe₂ O₃ ), hence iron is present in both II and III oxidation state.
Question 7
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Among the following statements the incorrect one is

A
Calamine and siderite are carbonate ores

B
Argentite and cuprite are oxides

C
Zinc blende and pyrites are sulphide ores

D
Malachite and azurite are ores of copper

Solution

Statement: Zinc blende and iron pyrites are sulphides. This statement is correct because zinc blende is ZnS and iron pyrites is FeS₂ .
Statement: Calamine and siderite are carbonates. This statement is correct because calamine is ZnCO₃ and siderite is FeCO₃ .
Statement: Malachite and azurite are ores of copper. This statement is also correct because malachite is Cu(OH)₂ .CuCO₃ and azurite isCu(OH)₂ .2CuCO₃ .
Statement: Argentite and cuprite are oxides. This statement is incorrect because argentite is Ag₂ S and cuprite is Cu₂ O.
Question 8
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A mineral is called an ore if

A
the percentage of metal content is more than 50 %

B
it is possible to isolate metal from it

C
a metal can be profitably extracted from it

D
if it is free from any earthly impurities

Solution

A mineral is called an ore if a metal can be profiteably extracted from it. e.g. Aluminium occur in earth 's crust in the form of two minerals i.e. bauxite (Al₂ O₃ . 2H₂ O) and clay (Al₂ O₃ . 2SiO₂ . 2H₂ O). Out of these two minerals aluminium can be conveniently and economically extracted from bauxite while no easy and cheap method is so far available for the extraction of aluminium from clay. Therefore, the ore of aluminium is bauxite.
Question 9
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Which is incorrect match?

A
Calamine = ZnCO₃

B
Siderite = Fe3O₄

C
Sphalerite = ZnS

D
Malachite = CuCO₃ . Cu(OH)₂

Solution

Siderite is a mineral composed of iron(II) carbonate (FeCO₃ )
Question 10
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The molecular formula of Glauber 's salt is:

A
MgSO₄ . 7H₂ O

B
FeSO₄ . 7H₂ O

C
CuSO₄ . 5H₂ O

D
Na₂ SO₄ . 10H₂ O

Solution

Glauber 's salt, common name for sodium sulfate decahydrate, Na₂ SO₄ .10H₂ O. It occurs as white or colorless monoclinic crystals. Upon exposure to fairly dry air, it effloresces, forming powdery anhydrous sodium sulfate.

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Principles & Isolation of Elements Test - 6

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Principles & Isolation of Elements Test - 6

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Question 1

O >Si >Fe >Al

O >Si >AI >Fe

O >C >Si >AI

AI >Fe >0 >Si

Solution

Question 2

Cuprite

Chalcocite

Chalcopyrite

Malachite

Solution

Question 3

It is an ore of Al

The non-metal is fluorine

It is used in aluminium extraction from bauxite

Its formula is 3NaF. AIF3

Solution

Question 4

+3, + 6

+3, + 2

+2, + 3

+2, + 6

Solution

Question 5

Ag, Cu and Pb

Ag, Cu and Sn

Ag, Mg and Pb

Al, Cu and Pb

Solution

Question 6

II, III in haematite and III in magnetite

II, III in haematite and II in magnetite

II in haematite and II, III in magnetite

Ill in haematite and II, III in magnetite

Solution

Question 7

Calamine and siderite are carbonate ores

Argentite and cuprite are oxides

Zinc blende and pyrites are sulphide ores

Malachite and azurite are ores of copper

Solution

Question 8

the percentage of metal content is more than 50 %

it is possible to isolate metal from it

a metal can be profitably extracted from it

if it is free from any earthly impurities

Solution

Question 9

Calamine = ZnCO3

Siderite = Fe3O4

Sphalerite = ZnS

Malachite = CuCO3 . Cu(OH)2

Solution

Question 10

MgSO4 . 7H2 O

FeSO4 . 7H2 O

CuSO4 . 5H2 O

Na2 SO4 . 10H2 O

Solution

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Its formula is 3NaF. AIF₃

Calamine = ZnCO₃

Siderite = Fe3O₄

Malachite = CuCO₃ . Cu(OH)₂

MgSO₄ . 7H₂ O

FeSO₄ . 7H₂ O

CuSO₄ . 5H₂ O

Na₂ SO₄ . 10H₂ O