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12th Chemistry weekly Test - 3 ( Metallurgy )

St. Britto Hr. Sec. School - Madurai

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

Time : 1.30 Hours

Part - A

Multiple Choice Question - Answer All Question

The blistered appearance of Cu obtained from the reverberatory furance is due to evolution of

CO₂ gas
S0₂gas
NO₂
Due to evaporation of volatile materials

Which of the metal is extracted by Hall-Heroult process?

Al
Ni
Cu
Zn

Zinc is extracted from Zinc blende by_________

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

Which of the following reduction is not thermodynamically feasible?

\({ Cr }_{ 2 }{ O }_{ 3 }+2Al\longrightarrow { Al }_{ 2 }{ O }_{ 3 }+2Cr\)
\({ Al }_{ 2 }{ O }_{ 3 }+2Cr\longrightarrow { Cr }_{ 2 }{ O }_{ 3 }+2Al\)
\(3Ti{ O }_{ 2 }+4Al\longrightarrow 2A{ l }_{ 2 }{ O }_{ 3 }+3Ti\)
none of these

Which among the following reaction represents the formation of slag?

\(Ca{ O }_{ (s) }+{ SiO }_{ 2(s) }\longrightarrow { CaSiO }_{ 3(s) }\)
\({ 2C }_{ (s) }+{ O }_{ 2(g) }\longrightarrow { 2CO }_{ (g) }\)
\({ Fe }_{ 2 }{ O }_{ 3 }+{ 3CO }_{ (g) }\longrightarrow 2{ Fe }_{ (l) }+{ 3CO }_{ 2(g) }\)
\({ CaCO }_{ 3(g) }\longrightarrow { CaO }_{ (s) }+{ CO }_{ 2(g) }\)

A mixture containing sulphides of copper and iron is called______

mineral
ore
matte
matrix

\({ Zn }_{ (s) }+2\left[ Au(CN)_{ 2 } \right] ^{ - }_{ (aq) }\longrightarrow \left[ Zn(CN)_{ 4 } \right] ^{ 2- }_{ (aq) }+2A{ { u }_{ (s) } }\) In the above equation the oxidation state of metallic gold is_______

1
0
+2
-2

Na[Ag(CN)₂] is _________.

Sodium aurocyanide
Sodium meta aluminate
Aluminosilicate
Sodium dicyano argentate

Identify the halide ore among the following

Epsom Salt
Pyrolusite
Anglesite
Rock Salt

Semiconductors are purified by_______method.

Zone refining
Electrolytic refining
Mond's process
Beisemerisation

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

Reducing agent
Oxidising agent
Slag
Flux

In the electrolytic refining of copper, which one of the following is used as anode?

Pure copper
Impure copper
Carbon rod
Platinum electrode

Considering Ellingham diagram, which of the following metals can be used to reduce alumina? (NEET-2018)

Fe
Cu
Mg
Zn

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 of the following statements, about the advantage of roasting of sulphide ore before reduction is not true?

\(\Delta { G }_{ f }^{ 0 }\) of sulphide is greater than those for CS₂ and H₂S
\(\Delta { G }_{ r }^{ 0 }\) is negative for roasting of sulphide ore to oxide
Roasting of the sulphide to its oxide is thermodynamically feasible
Carbon and hydrogen are suitable reducing agents for metal sulphides

Flux is a substance which is used to convert

Mineral into silicate
Infusible impurities to soluble impurities
Soluble impurities to infusible impurities
All of these

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

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

Zinc blende
Aragonite
Dolomite
Carnalite

Froth floatation process is suitable for concentrating ______ores.

oxide
carbonate
sulphide
halide

Which of the following is not a mineral of aluminium?

Bauxite
Cryolite
China clay
Malachite

Part - B

Generic 2 - Answer All Question

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

Can the same method of extraction be used for all metals

Define roasting,

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

Describe a method for refining nickel

What is the difference between minerals and ores?

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

Write the chemical reactions involved in the extraction of gold by cyanide process. Also give the role of zinc in the extraction.

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

What is distillation?

Part - C

Generic 3 - Answer All Question

Distinguish Roasting and Calcination

Support the statement given below with relevant examples.

"The choice of a reducing agent in a particular case depends on the thermodynamic factor".

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

(A)Using the Ellingham diagram given below:

Predict the conditions under which
(i) Aluminium might be expected to reduce magnesia.
(ii) Magnesium could reduce alumina.
(B) Carbon monoxide is more effective reducing agent than carbon below 983K but, above this temperature, the reverse is true –Explain.
(C) it is possible to reduce Fe₂O₃ by coke at a temperature around 1200K

How oxides of metals are reduced by hydrogen?

Explain roasting with an example.

Explain zone refining process with an example using the Ellingham diagram given below

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

What is meant by aluminotherrnitc process?

What is cementation?

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