Isolation of Elements Test 9

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Isolation of Elements Test 9

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Question 1
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Only One Option Correct Type
Direction (Q. Nos. 1-10) 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.
In the electrolytic refining of zinc

A
the impure metal is at the cathode

B
graphite is at the anode

C
acidified zinc sulphate is the electrolyte

D
the metal ion gets reduced at the anode

Solution

Electrodes are suspended in an electrolyte which is the solution of a soluble salt of the metal usually a double salt of the metal.
Question 2
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When compared to ΔG° for the formation of Al₂O₃ the ΔG° for the formation of Cr₂O₃ is

A
higher

B
Lower

C
Same

D
Unpredicted

Solution

ΔG° is higher for the formation of Cr₂O₃.
Question 3
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During the extraction of gold the following reactions take place
Au + CN^- + H₂O X,
X + Zn → Y + Au
Here, X and Y respectively are

A
[Au(CN)₂]^- and [Zn(CN)₄]^2-

B
[Au(CN)₄]^3- and [Zn(CN)₄]^2-

C
[Au(CN)₄]^2- and [Zn(CN)₄]^2-

D
[Au(CN)₂]^- and [Zn(CN)₆]^4-

Solution

4Au + 8KCN + O₂ + 2H₂O → 4K[Au(CN)₂]
[4Au(CN)₂]^- + Zn → [Zn(CN)₄]^2- + Au
Question 4
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Gold is extracted by hydrometallurgical process based on its property

A
of being electropositive

B
of being less reactive

C
to form complexes which are water soluble

D
to form salts which are water soluble

Solution

[Au(CN)₂]^- is water soluble complex.
Question 5
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During Hoope’s process for electrolytic refining of Al, the middle layer is of

A
pure Al

B
impure aluminium

C
cryolite and BaF₂

D
alloys of Al, Ca and Si

Solution

In the Hoope’s process the middle layer consists of cryolite and BaF₂.
Question 6
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Thermite is a mixture of iron oxide and

A
zinc powder

B
potassium metal

C
sodium shavings

D
aluminium powder

Solution

Thermite is a mixture of metallic oxide (Say. FeO, Cr₂O₃, Mn₃O₄) etc. and aluminium powder.
Question 7
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Which is an alloy of aluminium?

A
Magnalium

B
Duralumin

C
Brass

D
Both (a) and (b)

Solution

Magnalium consists of aluminium with from 5% to 30% mangesium. Duralumin is a light hard aluminium alloy containing about 4% copper and small amount of mangnesium.
Question 8
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Which one of the following metals has the largest abundance in the earth’s crust?

A
Aluminium

B
Calcium

C
Magnesium

D
Sodium

Solution

Aluminium is the metal which has the largest abundance in the earth's crust.
Question 9
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The processes used in the refining of aluminium and zinc metals respectively are

A
Hoope’s process and fractional distillation

B
Hoope’s process and cupellation

C
Poling and fractional distillation

D
cupellation and fractional distillation

Solution

The processes used in the refining of aluminium and zinc metals are Hoope's process and fractional distillation.
Question 10
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In sulphatizing roasting of ZnS products are

A
ZnO + SO₂

B
ZnO + ZnSO₄ + SO₂

C
ZnCI₂

D
Zn + SO₂

Solution

Due to incomplete roasting ZnSO₄ is formed.
Question 11
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Matching List Type
Direction (Q. Nos. 11 and 12) 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) → (q), (ii) → (r), (iii) → (p), (iv) → (s)
Question 12
1 / -0

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

A

B

C

D

Solution

(i) → (q), (ii) → (p), (iii) → (s), (iv) → (r)