General Principles and Processes of Isolation of Elements Test

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General Principles and Processes of Isolation of Elements Test - 45

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Weekly Quiz Competition

Question 1
1 / -0

The electrolytes usually used in the electroplating of gold and silver, respectively are:

A
$$[Au(OH)_4]^- and [Ag(OH)_2]^-$$

B
$$[Au(CN)_2]^- and [Ag(cl_2]^-$$

C
$$[Au(NH)_3)_2]^+ and [Ag(CN)_2]^-$$

D
$$[Au(CN)_2]^- and [Ag(CN)_2]^-$$

Solution

The Anode is a bar of silver metal, and the electrolyte (the liquid in between the electrodes) is a solution of Silver cyanide, $${[Ag{({CN})}_{2}]}^{-}$$, in water.

Gold plating is done in much the same way, using a gold anode and an electrolyte containing Gold cyanide, $${[Au{({CN})}_{2}]}^{-}$$.

Option D is correct
Question 2
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All of the following statements are true about Ellingham diagram, except:

A
the graph for the formation of $$CO_2$$ from $$CO$$ and $$O_2$$ is a straight line with upward slope.

B
the graph for the formation of $$CO$$ from carbon and oxygen is straight line almost parallel to temperature axis.

C
the graph for the formation of $$ZnO$$ shows sudden change with positive slope.

D
the graph for the formation of $$Ag_2O$$ is at upper part.

Solution
Question 3
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The combined state of metals are called:

A
Mineral

B
Gangue

C
Flux

D
Native form

Solution

The metal found in nature occur in the free or combined state it is generally known as pure metals. A native metal is a metal found in metallic state naturally. It can be in the pure form or in the form of an alloy.

$$Mineral:$$ Minerals are substances that are formed naturally in the earth. Minerals are usually solid, inorganic, have a crystal structure, and are formed naturally by geological process.

$$Gangue:$$ It is sand, rock and other impurities surrounding the minerals of interest in an ore. It is the combined state of the metal.

$$Flux:$$ It is a chemical cleaning, flowing or purifying agent. It is the substance added to the molten metals to bond with impurities that can be removed.

$$Native form:$$ Native element, any number of chemical elements that may occur in nature uncombined with other elements.

Hence, the correct option is B.
Question 4
1 / -0

The bodies of aircraft are often made using aluminium.
Which two properties of aluminium make it suitable for this use?

A
property 1 - good conductor of electricity ; property 2- good conductor of heat

B
property 1 - good conductor of electricity ; property 2- strong

C
property 1 - good conductor of heat ; property 2- low density

D
property 1 - strong ; property 2 - low density

Solution

$$\text{It is more important that metal used in aircraft is strong enough and lighter too hence aluminium is used rather than iron in aircraft.}$$
Question 5
1 / -0

In simple distillation of liquids, it involves simultaneously.

A
Vaporisation and condensation

B
Heating and sublimation

C
Vaporisation and sublimation

D
Boiling and filtration

Solution

Simple distillation happens through a process of heating and cooling liquids in order to separate and purify them. First, a liquid is heated, producing a vapor. Then, that vapor is cooled in a small tube called a condenser, in order to form a separate liquid. So, in simple distillation of liquids, it involves simultaneously vaporisation and condensation.
Question 6
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Match the refining methods (Column I) with metals (Column II).
Column I
(Refining methods) Column II
(Metals)
(I) Liquation (a) Zr
(II) Zone Refining (b) Ni
(III) Mond Process (c) Sn
(IV) Van Arkel Method (d) Ga

A
(I) - (b); (II) - (c); (III) - (d); (IV) - (a)

B
(I) - (b); (II) - (d); (III) - (a); (IV) - (c)

C
(I) - (c); (II) - (a); (III) - (b); (IV) - (d)

D
(I) - (c); (II) - (d); (III) - (b); (IV) - (a)

Solution

Solution:- (D) (I) - (c); (II) - (d); (III) - (b); (IV) - (a)
Liquation is used for Sn.
Zone refining is used for Ga.
Mond's process is used for Ni.
Van arkel process is used for Zr.
Question 7
1 / -0

Match the following:

(i) Biodegradable polymer (p) 3-Hydroxybutanoic acid
(ii) Bakelite (q) Phenol
(iii) Neoprene (r) 2-chlorobuta-1, 3-diene
(iv) Glyptal (s) phthalic acid

A
$$i - p, ii - q, iii - r, iv - s$$

B
$$i - q, ii - p, iii - r, iv - s$$

C
$$i - p, ii - q, iii - s, iv - r$$

D
$$i - s, ii - r, iii - p, iv - q$$

Solution

(i) PHBV (3-Hydroxybutanoic acid + 4-Hydroxypentanoic acid) is a biodegradable polymer.

(ii) Bakelite is synthesized from the monomer Phenol & Formaldehyde

(iii) 2-chlorobuta-1,3-diene is the monomer of Neoprene.

(iv) Glyptal is synthesized from the condensation polymerization of Phthalic acid & Ethylene glycol.

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

A copper coin was electroplated with Zn and then heated at high temperature until there is a change in colour. What will be the resulting colour ?

A
White

B
Black

C
Silver

D
Golden

Solution

Copper coin when electroplated with $$Zn$$ and then heated to high temperature, it forms brass.
Brass have golden colour.
Question 9
1 / -0

Which of the following term is not related to Al extraction?

A
Serpek's process

B
Hall-Heroult process

C
Thermite process

D
Hoop's process

Solution

Hoop process: A molten alloy of copper, crude aluminium and silicon is used as the anode. It forms the lowermost layer in the cell.

Hall-Heroult process: This is the major industrial process of smelting aluminium.

Serperk process: The powdered bauxite is mixed with carbon and heated up to $$1800^oC$$ and a current of nitrogen is passed, aluminum nitride is obtained. Silica is converted in to silicon (Si).

Aluminium is used as a reducing agent in thermite process.
Question 10
1 / -0

Froth flotation process is used for the

A
Oxide ores

B
Sulphide ores

C
Chloride ores

D
All of these

Solution

Only sulphide ores are concentrated by froth flotation process because pine oil selectively wets the sulphide ore and hence brings it to the froth. The sulphide ores preferably wetted by the oil and the gangue with the water.

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	Column I (Refining methods)		Column II (Metals)
(I)	Liquation	(a)	Zr
(II)	Zone Refining	(b)	Ni
(III)	Mond Process	(c)	Sn
(IV)	Van Arkel Method	(d)	Ga

(i)	Biodegradable polymer	(p)	3-Hydroxybutanoic acid
(ii)	Bakelite	(q)	Phenol
(iii)	Neoprene	(r)	2-chlorobuta-1, 3-diene
(iv)	Glyptal	(s)	phthalic acid

General Principles and Processes of Isolation of Elements Test - 45

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General Principles and Processes of Isolation of Elements Test - 45

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Question 1

$$[Au(OH)_4]^- and [Ag(OH)_2]^-$$

$$[Au(CN)_2]^- and [Ag(cl_2]^-$$

$$[Au(NH)_3)_2]^+ and [Ag(CN)_2]^-$$

$$[Au(CN)_2]^- and [Ag(CN)_2]^-$$

Solution

Question 2

the graph for the formation of $$CO_2$$ from $$CO$$ and $$O_2$$ is a straight line with upward slope.

the graph for the formation of $$CO$$ from carbon and oxygen is straight line almost parallel to temperature axis.

the graph for the formation of $$ZnO$$ shows sudden change with positive slope.

the graph for the formation of $$Ag_2O$$ is at upper part.

Solution

Question 3

Mineral

Gangue

Flux

Native form

Solution

Question 4

property 1 - good conductor of electricity ; property 2- good conductor of heat

property 1 - good conductor of electricity ; property 2- strong

property 1 - good conductor of heat ; property 2- low density

property 1 - strong ; property 2 - low density

Solution

Question 5

Vaporisation and condensation

Heating and sublimation

Vaporisation and sublimation

Boiling and filtration

Solution

Question 6

(I) - (b); (II) - (c); (III) - (d); (IV) - (a)

(I) - (b); (II) - (d); (III) - (a); (IV) - (c)

(I) - (c); (II) - (a); (III) - (b); (IV) - (d)

(I) - (c); (II) - (d); (III) - (b); (IV) - (a)

Solution

Question 7

$$i - p, ii - q, iii - r, iv - s$$

$$i - q, ii - p, iii - r, iv - s$$

$$i - p, ii - q, iii - s, iv - r$$

$$i - s, ii - r, iii - p, iv - q$$

Solution

Question 8

White

Black

Silver

Golden

Solution

Question 9

Serpek's process

Hall-Heroult process

Thermite process

Hoop's process

Solution

Question 10

Oxide ores

Sulphide ores

Chloride ores

All of these

Solution

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