12th Chemistry Monthly Test - 2 ( Metallurgy )

St. Britto Hr. Sec. School - Madurai

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

Time : 2.00 Hours

Part - A

Generic 2 - Answer All Question

What is the role of silica in the extraction of copper? (or)
Describe the role of SiO₂ in the extraction of Cu from Copper matte.

What are the different methods of concentration of ores?

What is meant by concentration?

What is leaching?

Define roasting,

Discuss the use of an acidic flux in metallurgy.

Discuss the process of roasting with suitable example.

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 metals that are obtained from their oxides using hydrogen as reducing agent.

Write the two similarities between calcination and roasting.

What is distillation?

Name some depressing agents

Name the two steps involved in the extraction of crude metal

Name some common methods of ore concentration.

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

What is the role of Limestone in the extraction of Iron from its oxide Fe₂O₃?

Name some reducing agents used to convert Metal oxides to metal
Why should we have a ecofriendly metallurgical process?

Name and discuss the principle involved in obtaining silicon of high purity.

Why is the froth floatation method selected for the concentration of sulphide ores?

Can the same method of extraction be used for all metals

Why are sulphide ores converted to oxide form before reduction to metal?

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

Describe a method for refining nickel

Which type of ores can be concentrated by froth floatation method? Give two examples for such ores.
What are the various steps involved in extraction of pure metals from their ores?

Name the ore that can be concentrated by magnetic separation method.

Part - B

Generic 5 - Answer All Question

Explain concentration by magnetic separation with diagram.
List out the application of aluminum

Explain refining of titanium by Van-Arkel method.

Explain the principle of electrolytic refining with an example.

List the applications of iron

How can you separate alumina from silica in a bauxite ore

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.

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.

Explain froth flotation, with diagram.

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

Explain refining of nickel by mond's process

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12th Chemistry Monthly Test - 2 ( Metallurgy )

St. Britto Hr. Sec. School - Madurai

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

Part - A

Generic 2 - Answer All Question

What is the role of silica in the extraction of copper? (or) Describe the role of SiO2 in the extraction of Cu from Copper matte.

What are the different methods of concentration of ores?

What is meant by concentration?

What is leaching?

Define roasting,

Discuss the use of an acidic flux in metallurgy.

Discuss the process of roasting with suitable example.

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 metals that are obtained from their oxides using hydrogen as reducing agent.

Write the two similarities between calcination and roasting.

What is distillation?

Name some depressing agents

Name the two steps involved in the extraction of crude metal

Name some common methods of ore concentration.

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

What is the role of Limestone in the extraction of Iron from its oxide Fe2O3?

Name some reducing agents used to convert Metal oxides to metal

Why should we have a ecofriendly metallurgical process?

Name and discuss the principle involved in obtaining silicon of high purity.

Why is the froth floatation method selected for the concentration of sulphide ores?

Can the same method of extraction be used for all metals

Why are sulphide ores converted to oxide form before reduction to metal?

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

Describe a method for refining nickel

Which type of ores can be concentrated by froth floatation method? Give two examples for such ores.

What are the various steps involved in extraction of pure metals from their ores?

Name the ore that can be concentrated by magnetic separation method.

Part - B

Generic 5 - Answer All Question

Explain concentration by magnetic separation with diagram.

List out the application of aluminum

Explain refining of titanium by Van-Arkel method.

Explain the principle of electrolytic refining with an example.

List the applications of iron

How can you separate alumina from silica in a bauxite ore

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.

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.

Explain froth flotation, with diagram.

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

Explain refining of nickel by mond's process

Comment

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What is the role of silica in the extraction of copper? (or)
Describe the role of SiO₂ in the extraction of Cu from Copper matte.

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?

What is the role of Limestone in the extraction of Iron from its oxide Fe₂O₃?

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

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.

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.