General Principles and Processes of Isolation of Elements Test

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General Principles and Processes of Isolation of Elements Test - 64

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Weekly Quiz Competition

Question 1
1 / -0

Radium is obtained from:

A
pitchblende

B
haematite

C
monazite

D
none of these

Solution

Radium is obtained from pitchblende, a material that contains uranium. The radioactivity of pitchblende was much greater than that of pure uranium.

Hence, the correct option is (A).
Question 2
1 / -0

$$Al_2O_3$$ formation from aluminium and oxygen involves evolution of a large quantity of heat, which makes aluminium use in

A
deoxidiser

B
confectionary

C
indoor photography

D
thermite welding

Solution
Question 3
1 / -0

A layer of coke is spread over bauxite during electrolytic reduction of alumina by Hall Heroult process. This layer acts as a/an

A
flux

B
slag to remove impurities

C
reducing agent

D
insulation and does not allow heat to escape

Solution

the correct option is (D)
explanation:
A layer of coke is spread over bauxite during electrolytic reduction of alumina by Hall Heroult process. This layer acts as as insulation by preventing it from corrosion, coke powder is kept at the top which also prevents escape of heat.
Question 4
1 / -0

One of the natural minerals of sodium is tincal. Its formula is:

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

B
$$NaNO_{3}$$

C
$$Na_{2}B_{4}O_{7}.10H_{2}O$$

D
$$NaCl$$

Solution

Tincal, also called borax is sodium tetraborate decahydrate with chemical formula $$Na_2B_4O_7.10H_2O$$.
Question 5
1 / -0

Potassium nitrate is called:

A
Mohr's salt

B
Indian saltpetre

C
Gypsum

D
Chile saltpetre

Solution

Potassium nitrate $$(KNO_3)$$ is also known as Indian saltpetre. This is because it is one of the several nitrogen-containing compounds and is very important as a crude salt in India. It is a major constituent of gun powder.

Hence the correct answer is option B.
Question 6
1 / -0

Among the following incorrect statements is:

A
Argantite and cuprite are oxide ores

B
Calamine and azurite are carbonates

C
Zinc blends and pyrites are sulphides

D
Malachite and azurite are ores of copper
Solution
- Argentite $$(Ag_2S)$$ and cuprite $$(Cu_2O)$$
Calamine $$(ZnCO_3)$$ and siderite $$(FeCO_3)$$
Zinc blende $$(ZnS)$$ and pyrites $$(FeS_2)$$
Malachite $$(CuCO_3.Cu(OH)_2)$$ and azurite $$(Cu_3(CO_3)_2(OH)_2)$$
Here Argentite is not an oxide.

Hence the correct answer is option A.
Question 7
1 / -0

Which of the following pairs are not correctly matched with respect to the extraction of metals from their ores

A
Leaching process - Silver and gold from their native ores.

B
Self reduction - Copper and mercury from their sulphide ores.

C
Carbon/carbonmonoxide reduction - Iron and zinc from their oxide ores.

D
Electrolytic reduction - Aluminium and tin from their oxide ores.
Question 8
1 / -0

The impurities associated with minerals used in metallurgy are collectively called

A
Slag

B
Flux

C
Gangue

D
Ore

Solution

The impurities associated with minerals used in metallurgy are collectively called Gangue.

Hence, Option "C" is the correct answer.
Question 9
1 / -0

Froth - floatation method is successful in separating impurities from ores because

A
the pure ore is lighter than water containing additives like pine oil , cresylic acid etc.

B
the pure ore is soluble in water containing additives like pine oil , cresylic acid etc.

C
the impurities are soluble in water containing additives like pine oil , cresylic acid etc.

D
the pure ore is not as easily wetted by water as by pine oil , cresylic acid etc.

Solution

Froth - floatation method is successful in separating impurities from ores because the pure ore is not as easily wetted by water as by pine oil , cresylic acid etc.

Hence, Option "D" is the correct answer.
Question 10
1 / -0

Froth floatation process is used for the concentration of

A
oxide ores

B
sulphide ores

C
chloride ores

D
amalgams

Solution

Froth floatation process is used for the concentration of Sulphide Ores.
Hence, Option "B" is the correct answer.

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General Principles and Processes of Isolation of Elements Test - 64

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General Principles and Processes of Isolation of Elements Test - 64

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Question 1

pitchblende

haematite

monazite

none of these

Solution

Question 2

deoxidiser

confectionary

indoor photography

thermite welding

Solution

Question 3

flux

slag to remove impurities

reducing agent

insulation and does not allow heat to escape

Solution

Question 4

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

$$NaNO_{3}$$

$$Na_{2}B_{4}O_{7}.10H_{2}O$$

$$NaCl$$

Solution

Question 5

Mohr's salt

Indian saltpetre

Gypsum

Chile saltpetre

Solution

Question 6

Argantite and cuprite are oxide ores

Calamine and azurite are carbonates

Zinc blends and pyrites are sulphides

Malachite and azurite are ores of copper

Solution

Question 7

Leaching process - Silver and gold from their native ores.

Self reduction - Copper and mercury from their sulphide ores.

Carbon/carbonmonoxide reduction - Iron and zinc from their oxide ores.

Electrolytic reduction - Aluminium and tin from their oxide ores.

Question 8

Slag

Flux

Gangue

Ore

Solution

Question 9

the pure ore is lighter than water containing additives like pine oil , cresylic acid etc.

the pure ore is soluble in water containing additives like pine oil , cresylic acid etc.

the impurities are soluble in water containing additives like pine oil , cresylic acid etc.

the pure ore is not as easily wetted by water as by pine oil , cresylic acid etc.

Solution

Question 10

oxide ores

sulphide ores

chloride ores

amalgams

Solution

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