General Principles and Processes of Isolation of Elements Test

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General Principles and Processes of Isolation of Elements Test - 16

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following technique uses high temperature to convert ore into raw metals?

A
Pyrometallurgy

B
Hydrometallurgy

C
Both a and b

D
None of above

Solution

After the ore is mined, the metals must be extracted, usually by chemical or electrolytic reduction. Pyrometallurgy uses high temperatures to convert ore into raw metals, while hydrometallurgy employs aqueous treatment for the same purpose.
Question 2
1 / -0

Aluminium foils are used for:

A
wrapping chocolates and food stuff

B
to prepare hydrogen

C
both $$A$$ and $$B$$

D
none of these

Solution

Aluminium foils are impermeable to oxygen and water; thus are used for wrapping chocolates and foodstuff.

It can be used for the preparation of hydrogen using the reaction of aluminium foil with a sodium hydroxide solution.

$$2Al + 2NaOH + 6H_2O \rightarrow 2Na[Al(OH)_4] + 3H_2\uparrow$$

Hence, the correct option is $$\text{C}$$
Question 3
1 / -0

Which of the following is a physical mean for concentration of ore?

A
Using sodium hydroxide

B
Using electrolysis

C
Froth flotation method

D
None of above

Solution

In many cases, it is possible to separate the metal compound from unwanted rocky material by physical means. A common example of this involves froth flotation. In this method, the unwanted object binds with air and comes on the surface as bubbles.
Question 4
1 / -0

When $$ZnS$$ and $$PbS$$ minerals are present together, then $$NaCN$$ is added to separate them in the froth flotation process as a depressant, because:

A
$$Pb(CN)_2$$ precipitated while no effect on $$ZnS$$

B
$$ZnS$$ forms soluble complex $$Na_2 Zn(CN)_4$$

C
$$PbS$$ forms soluble complex $$Na_2Pb(CN)_4$$

D
both $$(a)$$ and $$(b)$$

Solution

$$NaCN$$ prevents $$ZnS$$ from forming the froth by reacting with it to from complex $$Na_2[Zn(CN)_4]$$ and acts as a depressant. While it does not prevent $$PbS$$ from forming froth and both the ores can easily be separated.
Question 5
1 / -0

Which of the following pairs is incorrect?

A
Gneiss - Metamorphic

B
Rock salt - Sedimentary

C
Dolerite - Igneous

D
Dolomite - Igneous

Solution

Dolomite is a sedimentary rock. Therefore, the incorrect match is option D
Question 6
1 / -0

______ metal generally occurs in free state.

A
Sodium

B
Platinum

C
Magnesium

D
Potassium

Solution

Platinum is a chemical element with the symbol Pt and atomic number $$78$$. It is a dense, malleable, ductile, highly $$unreactive$$, precious, silverish-white transition metal. Since it is noble metal it is found in free state.
Question 7
1 / -0

In the Hall-Heroult process, aluminium is formed at the cathode. The cathode is made out of:

A
platinum

B
carbon

C
pure aluminium

D
copper

Solution

The hall-heroult process is used for smelting of aluminium.
In the Hall-Heroult process, the cathode is made of carbon. Also, here anode is also made up of carbon.

Hence, the correct option is $$\text{B}$$
Question 8
1 / -0

100% copper is obtained from crude copper by :

A
zone refining method

B
electrorefining

C
liquation

D
poling

Solution

In electrorefining step, impurities like Fe, Ni, Zn get dissolved in the solution while Au, Ag and Pt are deposited as anode mud below the anode and 100% copper is obtained from crude copper.
Question 9
1 / -0

The final product in solvay process is:

A
$$Na_{2}CO_{3}$$

B
$$Na_{2}CO_{3}.10H_{2}O$$

C
$$Na_{2}CO_{3}.H_{2}O$$

D
$$Na_{2}CO_{3}.8H_{2}O$$

Solution

The final product obtained in Solvay process (also known as ammonia soda process) is $${ Na }_{ 2 }C{ O }_{ 3 }\cdot 10{H }_{ 2 }O$$.
$$2NaHCO_3 \rightarrow Na_2CO_3 + H_2O + CO_2$$
Question 10
1 / -0

Method used for the concentration of sulphide ore is :

A
hand picking

B
froth floatation

C
magnetic separation

D
leaching

Solution

Froth floatation method is based on the principle of the difference in the wetting properties of the ore and the gangue particles with the water and oil. It is used for selectively separating hydrophobic material from hydrophilic. This method is used for that metals whose ore gets preferably wetted by the oil and the gangue by the water. The sulphide ores are preferably wetted by the oil and the gangue with water. Hence, this method is suitable for the concentration of the sulphide ore.

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General Principles and Processes of Isolation of Elements Test - 16

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General Principles and Processes of Isolation of Elements Test - 16

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SHARING IS CARING

Question 1

Pyrometallurgy

Hydrometallurgy

Both a and b

None of above

Solution

Question 2

wrapping chocolates and food stuff

to prepare hydrogen

both $$A$$ and $$B$$

none of these

Solution

Question 3

Using sodium hydroxide

Using electrolysis

Froth flotation method

None of above

Solution

Question 4

$$Pb(CN)_2$$ precipitated while no effect on $$ZnS$$

$$ZnS$$ forms soluble complex $$Na_2 Zn(CN)_4$$

$$PbS$$ forms soluble complex $$Na_2Pb(CN)_4$$

both $$(a)$$ and $$(b)$$

Solution

Question 5

Gneiss - Metamorphic

Rock salt - Sedimentary

Dolerite - Igneous

Dolomite - Igneous

Solution

Question 6

Sodium

Platinum

Magnesium

Potassium

Solution

Question 7

platinum

carbon

pure aluminium

copper

Solution

Question 8

zone refining method

electrorefining

liquation

poling

Solution

Question 9

$$Na_{2}CO_{3}$$

$$Na_{2}CO_{3}.10H_{2}O$$

$$Na_{2}CO_{3}.H_{2}O$$

$$Na_{2}CO_{3}.8H_{2}O$$

Solution

Question 10

hand picking

froth floatation

magnetic separation

leaching

Solution

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