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12th Chemistry Monthly Test - 3 ( Metallurgy )

St. Britto Hr. Sec. School - Madurai

12th Chemistry Monthly Test - 3 ( Metallurgy )-Aug 2020

Time : 2.30 Hours

Part - A

Generic 2 - Answer All Question

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

What is the difference between minerals and ores?

What is Ellingham diagram? or
What does Ellingham diagram represent?

Write the two similarities between calcination and roasting.

Name the two steps involved in the extraction of crude metal
What are the various steps involved in extraction of pure metals from their ores?

What are the various leaching processes?

Give reason : Extraction of copper directly from sulphide ores is less favourable than that from its oxide ores through reduction.

The reaction
\({ Cr }_{ 2 }{ O }_{ 3 }+2{ Al }_{ (s) }\longrightarrow { Al }_{ 2 }O_{ 3 }+2Cr\)
\(\Delta { G }^{ 0 }=-421KJ\) is thermodynamically feasible why does it not take place at room temperature?

Name the various refining process
Describe a method for refining nickel

What are the different methods of concentration of ores?

Name some depressing agents

Name some common methods of ore concentration.

What is calcination? Give example.

Name some reducing agents used to convert Metal oxides to metal

Define roasting,

Part - B

Generic 3 - Answer All Question

What is cyanide leaching? Give an example

Before reduction, the ore is first converted into the oxide of metal of interest. Give reason

What is gravity separation? (or)
Explain hydraulic washing?

Explain how the metal oxide is converted into metal using carbon as a reducing agent.

What is coupling of reaction? How is it useful in metallurgy?

What are the applications of the Ellingham diagram?

What is Misawite? Give its composition

What is meant by ammonia leaching?

How oxides of metals are reduced by hydrogen?
Write the complete set of reactions occurring in the zone of reduction in the blast furnace in the metallurgy of iron.

Define the term slag.

Part - C

Generic 5 - Answer All Question

Give the limitations of Ellingham diagram

The selection of reducing agent depends on the thermodynamic factor: Explain with an example.
Describe the role of the following in the process mentioned.
(i) Silica in the extraction of copper.
(ii) Cryolite in the extraction of aluminium.
(iii) Iodine in the refining of Zirconium.
(iv) Sodium cyanide in froth floatation.

Explain the principle of electrolytic refining with an example.

Write a short note on electrochemical principles of metallurgy.

List the applications of iron

Explain concentration by magnetic separation with diagram.

List out the application of aluminum

Explain froth flotation, with diagram.

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