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12th Chemistry weekly Test - 1 ( Metallurgy )

St. Britto Hr. Sec. School - Madurai

12th Chemistry weekly Test - 1 ( Metallurgy )-Aug 2020

Time : 1.30 Hours

Part - A

Multiple Choice Question - Answer All Question

The percentage of carbon in high carbon steel is_________

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

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

Zinc blende
Aragonite
Dolomite
Carnalite

Roasting of sulphide ore gives the gas (A).(A) is a colourless gas. Aqueous solution of (A) is acidic. The gas (A) is

CO₂
So₃
SO₂
H₂S

Which of the following is incorrect with respect to metallurgy of iron in the blast furnace?

Zone of combustion : \(C+{ O }_{ 2 }\rightarrow { CO }_{ 2 }\)
Zone of heat absorption : \({ CO }_{ 2 }\rightarrow C+{ O }_{ 2 }\)
Zone of slag formation : \(CaO+{ SiO }_{ 2 }\rightarrow CaSiO_{ 3 }\)
Zone of reduction : \({ Fe }_{ 2 }{ O }_{ 3 }+3C\rightarrow 3CO+2Fe\)

Magnetic separation it is based on the difference in the_________ of the ore and the impurities.

magnetic properties
chemical properties
physical properties
melting point

Which one of the following element is present as an impurity in pig iron?

Phosphorus
Manganese
Carbon
Silicon

Bauxite has the composition

Al₂O₃
Al₂O₃nH₂O
Fe₂O₃.2H₂O
None of these

Which among the following reaction represents the formation of slag?
\(Ca{ O }_{ (s) }+{ SiO }_{ 2(s) }\longrightarrow { CaSiO }_{ 3(s) }\)

\({ 2C }_{ (s) }+{ O }_{ 2(g) }\longrightarrow { 2CO }_{ (g) }\)

\({ Fe }_{ 2 }{ O }_{ 3 }+{ 3CO }_{ (g) }\longrightarrow 2{ Fe }_{ (l) }+{ 3CO }_{ 2(g) }\)

\({ CaCO }_{ 3(g) }\longrightarrow { CaO }_{ (s) }+{ CO }_{ 2(g) }\)
Extraction of gold and silver involves leaching with cyanide ion. silver is later recovered by (NEET-2017)
Distillation

Zone refining

Displacement with zinc

liquation

Which of the following is not true with respect to Ellingham diagram?

Free energy changes follow a straight line. Deviation occurs when there is a phase change.
The graph for the formation of CO2 is a straight line almost parallel to free energy axis.
Negative slope of CO shows that it becomes more stable with increase in temperature
Positive slope of metal oxides shows that their stabilities decrease with increase in temperature

Cinnabar is the sulphide ore of_________metal.

Zn
Pb
Hg
Ag

Part - B

Generic 2 - Answer All Question

Name some depressing agents

Out of coke and CO, which is better reducing agent for the reduction of ZnO? Why?

What is the role of graphite rods in the electro metallurgy of aluminium?

Write the two similarities between calcination and roasting.

List out the commercial uses of iron.
Can the same method of extraction be used for all metals

Part - C

Generic 3 - Answer All Question

Explain roasting with an example.

What is the role of depressants in froth flotation process?
Explain the electrometallurgy of aluminium

What is cementation?

What is meant by ammonia leaching?

What is liquation?

Part - D

Generic 5 - Answer All Question

Explain refining of nickel by mond's process

What is zone refining? Describe the principle involved in the purification of the metal by this method.
The selection of reducing agent depends on the thermodynamic factor: Explain with an example.

Write a short note on electrochemical principles of metallurgy.

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