General Principles and Processes of Isolation of Elements Test

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General Principles and Processes of Isolation of Elements Test - 38

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Weekly Quiz Competition

Question 1
1 / -0

Electrolytic reduction of alumina to aluminium by Hall-Heroult process is carried out:

A
in the presence of $$NaCl$$

B
in the presence of Hnorite

C
in the presence of cryolite which forms a melt with lower melting temperature

D
in the presence of cryolite which forms a melt with higher melting temperature

Solution

Electrolytic reduction of alumina to aluminium by Hall-Heroult process is carried out in the presence of cryolite which forms a melt with lower melting temperature.
Note: Addition of cryolite and fluorspar makes alumina a good conductor of electricity and lowers fusion temperature to around 1140 K.
Question 2
1 / -0

Which of the following is the most common use of copper:

A
roofing

B
plumbing

C
electrical equipment

D
construction

Solution

Cupper is a d-block element, its symbol is $$Cu$$ a soft malleable and ductile metal and very high thermal and electrical conductivity. A freshly cut surface of pure copper has a reddish bright color. Due to its good conductivity of electricity, it is used in electrical equipment.
Question 3
1 / -0

Auto-reduction is employed in the metallurgy of :

A
$$Hg$$

B
$$Al$$

C
$$Ti$$

D
$$Zn$$

Solution

Autoreduction is employed in the metallurgy of less electropositive metals such as $$ Hg, Pb $$ and $$Cu$$ e.g.,
$$ Hg S + O_2 \longrightarrow HgO $$
$$ HgO \xrightarrow {\triangle} Hg + O_2 $$
Question 4
1 / -0

Bessemer converter is used for the preparation of:

A
Steel

B
Wrought iron

C
Pig iron

D
Cast iron

Solution

Bessemer converter is used for the preparation of steel. This process is based on the fact that the impurities present in the pig iron are completely oxidised to form almost pure wrought iron. It is then mixed with known amount of spiegeleisen (an alloy of Fe, Mn and C) to obtain steel.

$$Si+ O_2 \rightarrow SiO_2$$

$$2Mn+O_2\rightarrow 2MnO$$

$$4P + 5O_2 \rightarrow 2P_2O_5$$

$$MnO + SiO_2 \rightarrow \underset{slag}{MnSiO_3}$$

$$P_2O_5+ 3CaO \rightarrow \underset{slag}{Ca_3(PO_4)_2}$$

$$CaO + SiO_2 \rightarrow CaSiO_3$$

$$Cu_2O + FeS \rightarrow Cu_2S + FeO$$

$$FeO + SiO_2 \rightarrow \underset{slag}{FeSiO_3}$$
Question 5
1 / -0

The ore that is concentrated by froth floatation process is:

A
Cinnabar

B
Dawdle

C
Malachite

D
Zincite

Solution

Froth floatation process is used for the concentration of sulphide ores only.

Cinnabar, $$HgS$$ is a sulphide ore. Hence, it is concentrated by froth floatation method.
Question 6
1 / -0

Which of the following metal is used with copper in the formation of alloy brass?

A
Zinc

B
Iron

C
carbon

D
silver

Solution

A uniform mixture of two allows is called alloy. Brass is an alloy made by the combination of copper and zinc. By change in the proportion of copper and zinc it is possible to make brass harder or softer. Other metals like aluminium, arsenic or lead are also used as alloying agents to improve its quality and corrosion resistance.
Question 7
1 / -0

Due to its high heat exchange rate, copper is used in:

A
dispenser

B
refrigerator

C
AC

D
all of them

Solution

Copper is a very good conductor of heat and electricity. Due to high heat exchange capacity of copper $$Cu$$ it has the wide range of uses in electrical types of equipment as a dispenser, refrigerator air conditioners, and electrical wires.
Question 8
1 / -0

Which metallurgy involves leaching?

A
$$Au$$

B
$$Ag$$

C
Both (a) and (b)

D
None of these

Solution

Gold and silver are extracted from their native ores by leaching. Leaching involves the treatment of the ore with suitable reagent as to make it soluble while impurities remain insoluble.
Question 9
1 / -0

Number of electrons involved in the electrodeposition of $$63.5\ g$$ of $$Cu$$ from a solution of $$CuSO_{4}$$ is?

A
$$6.022\times 10^{23}$$

B
$$3.011\times 10^{23}$$

C
$$12.044\times 10^{23}$$

D
$$6.022\times 10^{22}$$

Solution

$$\begin{array}{l} 63.5gm\, of\, Cu=1mol\, of\, Cu. \\ No.\, of\, equivalent=No.\, of\, moles\times valency\, factor \\ =1\times 2=2 \\ 1\, mole\, of\, electron\, \, will\, deposite\, 1\, equivalent. \\ Number\, of\, electron=2\times 6.022\times { 10^{ 23 } } \\ =12.044\times { 10^{ 23 } }. \\ Hence,\, option\, C\, is\, the\, correct\, answer. \end{array}$$
Question 10
1 / -0

Which method is used to get very pure germanium used in semiconductor ?

A
Vapour-phase refining

B
Electrolysis

C
Liquation

D
Zone-refining

Solution

Zone-refining is used to obtain metal of very high purity. The principle on which it is based is that an impure molten metal on gradual cooling will deposit its crystals of pure metal, while the impurities will be left in the remaining part of molten metal. Germanium metal can be purified by this method.

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General Principles and Processes of Isolation of Elements Test - 38

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General Principles and Processes of Isolation of Elements Test - 38

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Question 1

in the presence of $$NaCl$$

in the presence of Hnorite

in the presence of cryolite which forms a melt with lower melting temperature

in the presence of cryolite which forms a melt with higher melting temperature

Solution

Question 2

roofing

plumbing

electrical equipment

construction

Solution

Question 3

$$Hg$$

$$Al$$

$$Ti$$

$$Zn$$

Solution

Question 4

Steel

Wrought iron

Pig iron

Cast iron

Solution

Question 5

Cinnabar

Dawdle

Malachite

Zincite

Solution

Question 6

Zinc

Iron

carbon

silver

Solution

Question 7

dispenser

refrigerator

AC

all of them

Solution

Question 8

$$Au$$

$$Ag$$

Both (a) and (b)

None of these

Solution

Question 9

$$6.022\times 10^{23}$$

$$3.011\times 10^{23}$$

$$12.044\times 10^{23}$$

$$6.022\times 10^{22}$$

Solution

Question 10

Vapour-phase refining

Electrolysis

Liquation

Zone-refining

Solution

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