General Principles and Processes of Isolation of Elements Test

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General Principles and Processes of Isolation of Elements Test - 44

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Weekly Quiz Competition

Question 1
1 / -0

Froth flotation process is based upon :

A
Magnetic property of gangue

B
Specific gravity of ore particle

C
Preferential wetting of ore particle by oil

D
Preferential wetting of gangue particle by oil

Solution

Froth flotation is a physicochemical process who's basic principle is to separate particles based on differences in surface wettability of those particles. Naturally hydrophobic (dislike water) particles (e.g. coal particles), become selectively attached to air bubbles and are carried to the surface of the pulp. So the correct option is C
Question 2
1 / -0

Which of the following statements is correct wrt the following graph?

A
Below 1623 K, Mg reduces $$Al_2O_3$$

B
Above 1623 K, Al reduces MgO

C
Both (a) and (b) are correct

D
Both (a) and (b) are wrong

Solution
Question 3
1 / -0

The process of carrying out the reduction of metal oxides by heating with coke is termed as :

A
Roasting

B
Smelting

C
Zone refining

D
Ore dressing

Solution

Smelting is the process where heat is applied to ore to extract the base metal, using a reducing agent. So, it is used to carry out reduction of metal oxides to metal by heating with coke.
Question 4
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Identify $$x,\ y \ and \ z$$ for the following metallurgical process :

$$Metal\ sulphide\overset { x }{ \rightarrow } Metal\ oxide\overset { y }{ \rightarrow } Impure\ metal$$

$$x,\ y$$ and $$z$$ are respectively :

A
roasting, smelting, electrolysis

B
roasting, calcination, smelting

C
calcination, auto-reduction, basemerisation

D
None of the above

Solution

Roasting $$\rightarrow $$ It is a process in metallurgy
in which sulphide are is heated in
air and transforms into oxides.

Smelting $$\rightarrow $$ It is a process of extracting
a base metal from corresponding
metal oxides.

electrolysis $$ \rightarrow $$ It is used in metallurgical
process, such as in extraction or purification
of metals from ores or compounds.

Therefore, the correct option is A.
Question 5
1 / -0

Which of the following is NOT calcination?

A
$$Fe(OH)_3.xH_2O\rightarrow Fe_2O_3+H_2O$$

B
$$CuCO_3.Cu(OH)_2\rightarrow^ 2CuO+CO_2+H_2O$$

C
$$CaCO_3\rightarrow^ CaO+CO_2$$

D
$$(NH_4)_2CO_3\rightarrow^ 2NH_3+CO_2+H_2O$$

Solution

Calcination is a process of heating to high temperature in air or oxygen, however calcination is also used to mean a thermal treatment process in the absence or limited supply of air or oxygen.
$$(NH_4)_2CO_3$$ is not an ore.so, it do not undergo calcination.
Question 6
1 / -0

Which compound is used to separate two metal sulphide in forth flotation process :

A
$$ Na_2CO_3 $$

B
KCI

C
NaCN

D
$$ (SCN)_2 $$

Solution
Question 7
1 / -0

The above process is:
$$HgS\xrightarrow{O_2}HgS.HgO$$
$$\downarrow\Delta$$
$$Hg$$

A
auto oxidation

B
self reduction

C
thermal reduction

D
none of the above

Solution

Cinnabar ($$HgS$$), when heated with a current of $$O_2$$ gets reduced to $$Hg$$ without the need of any additional reducing agent. The process involved is known as self reduction
Question 8
1 / -0

Which of the following is colour blue ?

A
$$ CuF_2 $$

B
$$ CuF $$

C
$$ ZnF_2 $$

D
$$ ZnCl_2 $$

Solution

Colour of $$CuF_2$$ = White crystalline hygroscopic solid.
Colour of $$CuF$$ =White crystalline
Colour of $$ZnF2$$ =white
Colour of $$ZnCl2$$ =colourless or white. Copper hydroxide have blue colour
Question 9
1 / -0

Tetrabromoethane on treatment with Zn gives :

A
ethyl bromide

B
ethane

C
ethene

D
ethyne

Solution
Question 10
1 / -0

Hall-Heroult's process is given by:

A
$$Cr_2O_3 + 2Al \rightarrow Al_2O_3 + 2Cr$$

B
$$Cu^{2+}(aq) + H_2(g) \rightarrow Cu(s) + 2H^+ (aq)$$

C
$$ZnO + C \xrightarrow[]{Coke, 1673K} Zn + CO$$

D
$$2Al_2O_3 + 3C \rightarrow 4Al + 3CO_2$$

Solution

In Hall-Heroult's process is given by
$$2Al_2O_3 + 3C \rightarrow 4Al + 3CO_2$$
$$2Al_2O_3(\ell) \rightleftharpoons 4Al^{3+}(\ell) + 6O^{2\ominus} (\ell)$$
At cathode: $$4Al^{3+}_{(\ell)} + 12e^{\ominus} \rightarrow 4Al(\ell)$$
At Anode: $$6O^{2\ominus}_{(\ell)} \rightarrow 2O_2(g) + 12e^{\ominus}$$
$$3C + 3O_2 \rightarrow 3CO_2 (\uparrow)$$

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Re-Attempt Weekly Quiz Competition

General Principles and Processes of Isolation of Elements Test - 44

Result

General Principles and Processes of Isolation of Elements Test - 44

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Rank

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SHARING IS CARING

Question 1

Magnetic property of gangue

Specific gravity of ore particle

Preferential wetting of ore particle by oil

Preferential wetting of gangue particle by oil

Solution

Question 2

Below 1623 K, Mg reduces $$Al_2O_3$$

Above 1623 K, Al reduces MgO

Both (a) and (b) are correct

Both (a) and (b) are wrong

Solution

Question 3

Roasting

Smelting

Zone refining

Ore dressing

Solution

Question 4

roasting, smelting, electrolysis

roasting, calcination, smelting

calcination, auto-reduction, basemerisation

None of the above

Solution

Question 5

$$Fe(OH)_3.xH_2O\rightarrow Fe_2O_3+H_2O$$

$$CuCO_3.Cu(OH)_2\rightarrow^ 2CuO+CO_2+H_2O$$

$$CaCO_3\rightarrow^ CaO+CO_2$$

$$(NH_4)_2CO_3\rightarrow^ 2NH_3+CO_2+H_2O$$

Solution

Question 6

$$ Na_2CO_3 $$

KCI

NaCN

$$ (SCN)_2 $$

Solution

Question 7

auto oxidation

self reduction

thermal reduction

none of the above

Solution

Question 8

$$ CuF_2 $$

$$ CuF $$

$$ ZnF_2 $$

$$ ZnCl_2 $$

Solution

Question 9

ethyl bromide

ethane

ethene

ethyne

Solution

Question 10

$$Cr_2O_3 + 2Al \rightarrow Al_2O_3 + 2Cr$$

$$Cu^{2+}(aq) + H_2(g) \rightarrow Cu(s) + 2H^+ (aq)$$

$$ZnO + C \xrightarrow[]{Coke, 1673K} Zn + CO$$

$$2Al_2O_3 + 3C \rightarrow 4Al + 3CO_2$$

Solution

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