General Principles and Processes of Isolation of Elements Test

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General Principles and Processes of Isolation of Elements Test - 39

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Weekly Quiz Competition

Question 1
1 / -0

A solution is a homogeneous mixture of two or more substances. Which of the following is a solution?

A
Milk

B
Smoke

C
Brass

D
Face Cream

Solution

Alloys are the homogeneous mixture of metals or metals and non metals. Brass is an alloy of copper and zinc
Brass $$Cu-70$$%
$$Zn-30$$%
Alloys are solid-solid solution
Question 2
1 / -0

The most common ore of iron is ___________.

A
calamine

B
hematite

C
zinc blende

D
copper pyrite

Solution

Calamine is an ore of zinc and hematite is an ore of iron.
Option $$B$$ is correct.
Question 3
1 / -0

The transition element used for making calorimeters is:

A
$$Cr$$

B
$$Ni$$

C
$$Zn$$

D
$$Cu$$

Solution

The transition element used for making calorimeters is copper. Copper is used as it has low heat capacity.
Question 4
1 / -0

Among $$K, Mg, Au$$ and $$Cu$$, the one which is extracted by heating its ore in air is:

A
$$K$$

B
$$Mg$$

C
$$Au$$

D
$$Cu$$

Solution

Among $$K, Mg, Au$$ and $$Cu$$, the one which is extracted by heating its ore in air is $$Cu$$.
In a reverberatory furnance, the concentrated ore is roasted in presence of limited supply of air. A mixture of $$ \displaystyle FeS$$ and $$ \displaystyle Cu_2S$$ is formed.
$$ \displaystyle 2CuFeS_2+O_2 \rightarrow Cu_2S + 2FeS+SO_2$$
$$ \displaystyle Cu_2S$$ is then converted to $$ \displaystyle Cu$$ by auto reduction method.
$$ \displaystyle 2Cu_2S+3O_2 \rightarrow 2Cu_2O+2SO_2$$
$$ \displaystyle Cu_2S+2Cu_2O \rightarrow 6Cu+SO_2$$
Question 5
1 / -0

Stainless steel contains:

A
$$Fe,Ni,Cr$$

B
$$Fe,Ni,Sn$$

C
$$Fe,C,S$$

D
$$Fe,P,Cr$$

Solution

Iron, Nickel, Chromium
Question 6
1 / -0

Purification of aluminium by electrolytic refining is called:

A
Serpeck's process

B
Hoope's process

C
Hall's process

D
Baeyer's process

Solution

Purification of aluminium by electrolytic refining is called Hoope's process. Serpeck, Hall's and Baeyer process are chemical process.
Question 7
1 / -0

Bauxite, the ore of aluminium, is purified by which process?

A
Hoope's process

B
Hall's process

C
Mond's process

D
Liquation process

Solution

Bauxite, the ore of aluminium, is purified by either Hall's process or Baeyer's process or Serperck's process. Mond's process is used for refining nickel. Liquation process is used for refining $$Bi,\ Sn,\ Pb$$ and $$Hg$$.
Question 8
1 / -0

The ore that can be concentrated by magnetic separation method is:

A
bauxite $$(Al_{2}O_{3}.xH_{2}O)$$

B
pyrolusite $$(MnO_{2})$$

C
cuprite $$(Cu_{2}O)$$

D
zincite $$(ZnO)$$

Solution

The ore that can be concentrated by magnetic separation method is pyrolusite $$(MnO_{2})$$.
In this method, the ferromagnetic and non-magnetic particles in the ore are separated by an electromagnetic separator.
Question 9
1 / -0

Which of the following is the ore of $$Cu$$?

A
Ciderite

B
Magnetite

C
Calamine

D
Malachite

Solution

Ore of copper is malachite $$CuCO_{3}.Cu(OH)_{2}$$.
Question 10
1 / -0

Which of the following factors is of no significance for roasting sulphide ores to the oxides and not subjecting the sulphide ores to carbon reduction directly?

A
Metal sulphides are thermodynamically more stable than $$CS_2$$

B
$$CO_2$$ is thermodynamically more stable than $$CS_2$$

C
Metal sulphides are less stable than the corresponding oxides

D
$$CO_2$$ is more volatile than $$CS_2$$

Solution

The reduction of metal sulfides by the carbon reduction process is not spontaneous as the change in Gibb's free energy ($$\triangle G$$) for such a process is positive.

The reduction of metal oxides by the carbon reduction process is spontaneous as $$\triangle G$$ for such a process is negative.

Thus $$CO_2$$ is more stable than $$CS_2$$ and the metal sulfides are more stable than the corresponding oxides.

Hence, the factor listed in option $$C$$ is of no significance.

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General Principles and Processes of Isolation of Elements Test - 39

Result

General Principles and Processes of Isolation of Elements Test - 39

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Question 1

Milk

Smoke

Brass

Face Cream

Solution

Question 2

calamine

hematite

zinc blende

copper pyrite

Solution

Question 3

$$Cr$$

$$Ni$$

$$Zn$$

$$Cu$$

Solution

Question 4

$$K$$

$$Mg$$

$$Au$$

$$Cu$$

Solution

Question 5

$$Fe,Ni,Cr$$

$$Fe,Ni,Sn$$

$$Fe,C,S$$

$$Fe,P,Cr$$

Solution

Question 6

Serpeck's process

Hoope's process

Hall's process

Baeyer's process

Solution

Question 7

Hoope's process

Hall's process

Mond's process

Liquation process

Solution

Question 8

bauxite $$(Al_{2}O_{3}.xH_{2}O)$$

pyrolusite $$(MnO_{2})$$

cuprite $$(Cu_{2}O)$$

zincite $$(ZnO)$$

Solution

Question 9

Ciderite

Magnetite

Calamine

Malachite

Solution

Question 10

Metal sulphides are thermodynamically more stable than $$CS_2$$

$$CO_2$$ is thermodynamically more stable than $$CS_2$$

Metal sulphides are less stable than the corresponding oxides

$$CO_2$$ is more volatile than $$CS_2$$

Solution

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