General Principles and Processes of Isolation of Elements Test

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General Principles and Processes of Isolation of Elements Test - 66

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Weekly Quiz Competition

Question 1
1 / -0

Zone refining is a technique used primarily for which one of the following process

A
Alloying

B
Tempering

C
Sintering

D
Purification

Solution

Zone refining is a method of purification used for semiconductors like $$Si , Ge $$ and $$Ga.$$
Question 2
1 / -0

The chemical processes in the production of steel from haematite ore involve

A
reduction

B
oxidation

C
reduction followed by oxidation

D
oxidation followed by reduction

Solution

The chemical processes in the production of steel from haematite ore involve oxidation followed by reduction. Firstly, carbon which is added along which crushed haematite ore is oxidised to $$ CO$$ and $$CO_2$$ and second, the produced $$CO$$ acts as the chief reducing agent for the reduction of haematite to steel.
Question 3
1 / -0

Copper metal is used in :

A
Making electric wires

B
Filing tooth cavities

C
Making fuse wires

D
Preparation of hydrogen

Solution
Question 4
1 / -0

While extracting an element from its ore, the ore is ground and leached with dilute KCN solution to form the soluble product potassium argentocyanide. The element is

A
Lead

B
Chromium

C
Manganese

D
Silver

Solution

Silver metal is extracted from the argenite ore $$Ag_2S$$. By cyanide process, in this method the concentrated ore is treated with dilute solution of potassium cyanide, then a soluble complex potassium dicyanoargenate(I) is formed which when reacted with zinc, silver is extracted as a ppt.

$$Ag_2S + 4KCN \rightarrow 2K[Ag(CN)_2] + NaS $$

$$2K[Ag(CN)_2] + Zn \rightarrow K_2[Zn(CN)_4] + 2Ag \downarrow$$
Question 5
1 / -0

In the electrolytic purification of copper some gold is found in the

A
cathode

B
cathode mud

C
anode mud

D
electrolyte

Solution

Gold being very less reactive than Copper is found in Anode mud.
Hence, Option "C" is the correct answer.
Question 6
1 / -0

Aluminium is not used to make

A
Foils

B
Wires

C
Fireworks

D
Utensils
Solution
- Aluminium is not used to make fireworks because aluminum is a metal that can melt but can not burn, during fire tests when the temperature exceeds the melting point in the range of $$600^\circ C$$.
- The thermal conductivity of aluminum is four times greater than steel and its specific heat is twice that of steel. So, it acts as effective protection against fire rather than being used in fireworks.
- So, aluminum is not used to make fireworks but it is frequently used to make foils, wires, and utensils due to its ductile and strong metallic bond capacity.
Question 7
1 / -0

Select correct statement:

A
The decomposition of an oxide into oxygen and metal vapour increases

B
Decomposition of an oxide is an endothermic change

C
To make $$\Delta G^{o}$$ negative, temperature should be high enough so that $$T \Delta S^{o} > \Delta H^{o}$$

D
All are correct statements

Solution

thus, all statement are correct.
Question 8
1 / -0

Ellingham diagram represent :

A
Change of $$ \Delta G $$ with temperature

B
$$ \Delta H $$ with temperature

C
$$ \Delta G $$ with pressure

D
change of ($$ \Delta G - T \Delta S $$-)

Solution
Question 9
1 / -0

In the alumino-thermite process, Al acts as:

A
an oxidizing agent

B
a flux

C
solder

D
a reduction agent

Solution
Question 10
1 / -0

Forth floatation process used for the concentration of sulphide ore:

A
Is based on the difference in wettability of different minerals

B
uses sodium ethyl xanthate $$C_{2}H_{5}OCS_{2}Na$$ as collector

C
uses NaCN as depressant in the mixture of ZnS forms soluble complex and Pbs forms forth

D
All are correct statements

Solution

Forth floatation process used for the concentration of sulphide ore is based on the difference in wettability of different minerals, uses sodium ethyl xanthate $$C_{2}H_{5}OCS_{2}Na$$ as collector & uses NaCN as depressant in the mixture of ZnS forms soluble complex and Pbs forms forth.

Hence, Option "D" is the correct answer.

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Re-Attempt Weekly Quiz Competition

General Principles and Processes of Isolation of Elements Test - 66

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General Principles and Processes of Isolation of Elements Test - 66

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SHARING IS CARING

Question 1

Alloying

Tempering

Sintering

Purification

Solution

Question 2

reduction

oxidation

reduction followed by oxidation

oxidation followed by reduction

Solution

Question 3

Making electric wires

Filing tooth cavities

Making fuse wires

Preparation of hydrogen

Solution

Question 4

Lead

Chromium

Manganese

Silver

Solution

Question 5

cathode

cathode mud

anode mud

electrolyte

Solution

Question 6

Foils

Wires

Fireworks

Utensils

Solution

Question 7

The decomposition of an oxide into oxygen and metal vapour increases

Decomposition of an oxide is an endothermic change

To make $$\Delta G^{o}$$ negative, temperature should be high enough so that $$T \Delta S^{o} > \Delta H^{o}$$

All are correct statements

Solution

Question 8

Change of $$ \Delta G $$ with temperature

$$ \Delta H $$ with temperature

$$ \Delta G $$ with pressure

change of ($$ \Delta G - T \Delta S $$-)

Solution

Question 9

an oxidizing agent

a flux

solder

a reduction agent

Solution

Question 10

Is based on the difference in wettability of different minerals

uses sodium ethyl xanthate $$C_{2}H_{5}OCS_{2}Na$$ as collector

uses NaCN as depressant in the mixture of ZnS forms soluble complex and Pbs forms forth

All are correct statements

Solution

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