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12th Chemistry weekly Test - 2 ( Metallurgy )

St. Britto Hr. Sec. School - Madurai

12th Chemistry weekly Test - 2 ( Metallurgy )-Aug 2020

Time : 1.30 Hours

Part - A

Multiple Choice Question - Answer All Question

Which of the following is commonly used to produce foam in froth floatation process?

Pine oil
Cresol
NaCN
Xanthate

Which of the following will give respective metal by self reduction?

Galena (PbS)
HgS
ZnS
Both (a) & (b)

Metal oxide is converted into metal by the _______ process.

Calcination
roasting
smelting
beesemerisation

Electrochemical process is used to extract

Iron
Lead
Sodium
silver

Sulphide ore is converted to oxide form by using the process_________

Calcination
Roasting
Smelting
Leaching

Bauxite has the composition

Al₂O₃
Al₂O₃nH₂O
Fe₂O₃.2H₂O
None of these

Zinc is extracted from Zinc blende by_________

Carbon reduction process
Nitrogen reduction process
Oxygen reduction process
All of these

Which of the following mineral contains calcium as well as magnesium?

Zinc blende
Aragonite
Dolomite
Carnalite

Which of the following plot gives Ellingham diagram

\(\Delta SVsT\)
\(\Delta { G }^{ 0 }VsT\)
\(\Delta { G }^{ 0 }Vs\cfrac { 1 }{ T } \)
\(\Delta { G }^{ 0 }Vs{ T }^{ 2 }\)

Gibb's free energy is given by_______

\(\Delta { G }^{ 0 }=-nF{ E }^{ 0 }\)
\(\Delta { G }^{ o }=nF\)
\(\Delta { G }^{ o }=nF{ E }^{ o }\)
\(\Delta { E }^{ o }=-nF{ G }^{ 0 }\)

Which of the following is used for concentrating ore in metallurgy?

Leaching
Roasting
Froth floatation
Both (a) and (c)

In the metallurgy of iron , limestone is added to coke, which acts as a_______

Reducing agent
Oxidising agent
Slag
Flux

Cinnabar is the sulphide ore of_________metal.

Zn
Pb
Hg
Ag

Na[Ag(CN)₂] is _________.

Sodium aurocyanide
Sodium meta aluminate
Aluminosilicate
Sodium dicyano argentate

The percentage of carbon in high carbon steel is_________

0.5 - 1%
0.15 - 1.5%
0.15 - 1.5%
0.15 - 0.3%

The metal oxide which cannot be reduced to metal by carbon is

PbO
Al₂O₃
ZnO
FeO

In the extraction of aluminium from alumina by electrolysis, cryolite is added to

Lower the melting point of alumina
Remove impurities from alumina
Decrease the electrical conductivity
Increase the rate of reduction

The incorrect statement among the following is

Nickel is refined by Mond’s process
Titanium is refined by Van Arkel’s process
Zinc blende is concentrated by froth floatation
In the metallurgy of gold, the metal is leached with dilute sodium chloride solution

Identify the decreasing order of carbon content in different forms of iron

Wrought iron> Pig iron> castiron
Castiron > Pig iron> Wrought iron
Pig iron> Cast iron> Wrought iron
Cast iron> Wrought iron> Pig iron

Steel is an alloy of___________

iron and carbon
iron and calcium
copper and carbon
copper and iron

Part - B

Generic 5 - Answer All Question

Write short note on the following:
(i) The process in which no external reducing agent is used.
(ii) The process which is used for highly electro positive metal.
(iii) Write the equation involved in the thermite process.

The selection of reducing agent depends on the thermodynamic factor: Explain with an example.

List out the application of aluminum

Explain refining of titanium by Van-Arkel method.

In the extraction of copper, explain the smelting process.

What is zone refining? Describe the principle involved in the purification of the metal by this method.

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