General Principles and Processes of Isolation of Elements Test

Result

General Principles and Processes of Isolation of Elements Test - 35

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
1 / -0

An ore on heating in air forms $$SO_{2}$$. State the process that will be used for its concentration.

A
Hydrautic washing

B
Magnetic separation

C
Froth floatation

D
None of the above

Solution

Whenever a metal sulphide is heated in air, sulphur dioxide is formed as one of the products. A sulphide ore is concentrated by the froth floatation process.
Question 2
1 / -0

Define roasting.

A
Heating of sulphide ores in the presence of excess air to convert them into oxides

B
Heating of carbonate ores in the limited supply of air to convert them into oxides

C
Heating of oxides of metals to turn them into metal

D
Heating of carbonate ores in the limited supply of air to convert them into sulphide

Solution

Ores found in the form of sulphide and carbonates are first converted to their oxides by the process of roasting and calcination. Heating of sulphide ores in the presence of excess air to convert them into oxides is known as roasting.
Question 3
1 / -0

Ores in the form of sulphide and carbonate are converted into:

A
water

B
oxides

C
aldehyde

D
alcohol

Solution

It is easy to obtain metals from their oxides. So, ores found in the form of sulphide and carbonates are first converted to their oxides by the process of roasting and calcination.
Question 4
1 / -0

In froth floatation process for the purification of ores, the particles of ore float because :

A
their surface is not easily wetted by water

B
they are light

C
they are insoluble

D
they bear electrostatic charge

Solution

Froth floatation process works on the principle of difference in wettability between the ore and the gangue particles.
Particles that can be easily wetted by water are called hydrophilic, while particles that are not easily wetted by water are called hydrophobic. Hydrophobic particles have a tendency to form a separate phase in aqueous media.
In froth floatation process, first the powdered ore is added to water with frothing agent (pine oil) along with collecting agent (sodium ethyl xanthate) is added. Cresol and aniline are added to stabilize the froth. A vigorous stream of air is passed to agitate the mixture, as a result, the particles of sulphide ore stick to the oil and rise to the surface in the form of froath. However, the gangue particles are wetted by water and settled down at the bottom of the tank. Thus the purification of the ores occur by this method.

Option A is the valid answer.
Question 5
1 / -0

Which one of the following ores is concentrated by froth floatation process?

A
Magnesite

B
Magnetic

C
Galena

D
Malachite

Solution

Galena $$(PbS)$$ is concentrated by froth floatation process. Froth floatation method is used to concentrate sulphide ores.
Question 6
1 / -0

A number of elements available in earth's crust but most abundant elements are:

A
$$Al$$ and $$Fe$$

B
$$Al$$ and $$Cu$$

C
$$Fe$$ and $$Cu$$

D
$$Cu$$ and $$Ag$$

Solution

Percentage abundance of elements in earth's crust are :
1. Oxygen - 46.6%
2. Silicon - 27.7%
3. Aluminium - 8.1%
4. Iron - 5.0%

Thus, aluminium and iron are the most abundant elements on earth crust among the given options.
Question 7
1 / -0

The ratio of $$Fe_{2}O_{3}$$ and $$Al$$ by weight, in thermite is about:

A
$$1 : 3$$

B
$$1 : 2$$

C
$$3 : 1$$

D
none of the above

Solution

Thermite is the mixture of $$Fe_{2}O_{3}$$ and $$Al$$. Due to great affinity of aluminium toward oxygen, it readily combines with oxygen. Hence, Goldsmith used $$Al$$ to reduce metal oxides in extraction. In thermite the ratio of $$Fe_{2}O_{3}$$ and $$Al$$ is taken $$3 : 1$$ by weight.
$$Fe_{2}O_{3} + 2Al\rightarrow 2Fe + Al_{2}O_{3}$$
$$(2\times 56 + 3\times 16 = 160) (2\times 27 = 54)$$
Question 8
1 / -0

___________ metals occur free in nature.

A
Alkali

B
Noble

C
Iron

D
Aluminum

Solution

A noble metal is any metal that is found in its metallic form, either pure or alloyed, in nature. Over geological time scales, very few metals can resist natural weathering processes like oxidation, which is why generally only the less reactive metals such as gold and platinum are found as noble metals.
Question 9
1 / -0

A mixture of $$Sn$$ and $$Pb$$ can be separated by __________ method.

A
hank picking

B
distillation

C
liquation

D
winnowing

Solution

Liquation is a metallurgical method for separating metals from an ore or alloy. The material must be heated until one of the metals starts to melt and drain away from the other and can be collected.
Tin has a lower melting point compared to Lead and hence, tin melts and flows and it is separated from lead.
Therefore a mixture of $$Sn$$ and $$Pb$$ can be separated by liquation method.
Question 10
1 / -0

The first step in the hydrometallurgical process is___________.

A
Filteration

B
Electrolysis

C
Reduction

D
Leaching

Solution

The first step in the hydrometallurgical process is leaching, which involves dissolution of the valuable metals into the aqueous solution and /or a suitable solvent.

User

Question Analysis

Correct -
Wrong -
Skipped -

My Perfomance

Score
-
out of -
Rank
-
out of -

Re-Attempt Weekly Quiz Competition

General Principles and Processes of Isolation of Elements Test - 35

Result

General Principles and Processes of Isolation of Elements Test - 35

Score

-

Rank

-

SHARING IS CARING

Question 1

Hydrautic washing

Magnetic separation

Froth floatation

None of the above

Solution

Question 2

Heating of sulphide ores in the presence of excess air to convert them into oxides

Heating of carbonate ores in the limited supply of air to convert them into oxides

Heating of oxides of metals to turn them into metal

Heating of carbonate ores in the limited supply of air to convert them into sulphide

Solution

Question 3

water

oxides

aldehyde

alcohol

Solution

Question 4

their surface is not easily wetted by water

they are light

they are insoluble

they bear electrostatic charge

Solution

Question 5

Magnesite

Magnetic

Galena

Malachite

Solution

Question 6

$$Al$$ and $$Fe$$

$$Al$$ and $$Cu$$

$$Fe$$ and $$Cu$$

$$Cu$$ and $$Ag$$

Solution

Question 7

$$1 : 3$$

$$1 : 2$$

$$3 : 1$$

none of the above

Solution

Question 8

Alkali

Noble

Iron

Aluminum

Solution

Question 9

hank picking

distillation

liquation

winnowing

Solution

Question 10

Filteration

Electrolysis

Reduction

Leaching

Solution

User

Question Analysis

My Perfomance

Score

-

Rank

-

Results Announcement on: coming Monday

Stay Tuned: We’ll update you on your result via email or SMS.