Bauxite has the composition ______.

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

Which one of the following reaction represents calcinations?

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

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

Assertion: Aluminium is used in the design of chemical reactors, medical equipments, refrigeration units and gas pipelines.
Reason: Aluminium shows high resistance to corrosion
Codes:
a) Both (A) and (R) are true and (R) is the correct explanation of (A)
b) Both (A) and (R) are true and (R) is not the correct explanation of (A).
c) (A) true but (R) false
d) Both (A) and (R) are false.

Assertion: Metallic zinc is used in galvanising metals such as iron and steel.
Reason: Zinc is also used to produce die castings
Codes:
a) Both (A) and (R) are true and (R) is the correct explanation of (A).
b) Both (A) and (R) are true and (R) is not the correct explanation of (A).
c) (A) true but (R) false.
d) Both (A) and (R) are false.

Assertion: Zone refining is carried out in an inert gas atmosphere
Reason: The metal is treated with a suitable reagent which can form a volatile compound with the metal.
Codes:
a) Both (A) and (R) are true and (R) is the correct explanation of (A).
b) Both (A) and (R) are true and (R) is not the correct explanation of (A).
c) (A) true but (R) false.
d) Both (A) and (R) are false

Assertion: Cuprite is concentrated by froth flotation process.
Reason: Cuprite is the sulphide ore
Codes:
a) Both assertion and reason are true and the reason is the correct explanation of the assertion.
b) Both assertion and reason are true but the reason is not the correct explanation of the assertion.
c) Assertion is true, but reason is false.
d) Both assertion and reason are false

Assertion: Calamine and Dolomite are the Carbonate ores.
Reason: Calamine is ZnCO₃ whereas dolomite is MgCO₃.ZnCO₃.
Codes:
a) Both assertion and reason are true and the reason is the correct explanation of the assertion.
b) Both assertion and reason are true but the reason is not the correct explanation of the assertion.
c) Assertion is true, but reason is false.
d) Both assertion and reason are false

I. All ores are minerals.
II. All minerals are not ores.
III. Aluminium can be extracted from bauxite.
IV. Aluminium can be extracted from china clay.
a) Only I
b) Only II
c) III & IV
d) I, II & III

I. Copper is the first metal used by the human
II. Aluminuim is used in galvanising metals
III. Aluminium is a good conductor of electricity
IV. Magnets can be made from iron.
a) Only I
b) Only II
c) I, III & IV
d) III & IV

I. Ellingham diagram helps to select a suitable reducing agent.
II. Magnesite is calcinated to obtain magnesia.
III. Calcination is a process of cooling substances. 
IV. Sulphur dioxide is harmful to the environment.
a) I, II & IV
b) Only II
c) Only I
d) III & IV

I. Froth flotation is used to concentrate sulphide ores.
II. Magnetic separation is applicable for ferromagnetic ores.
III. Roasting method used to sulphide ores to oxides
IV. Magnetic separation is used to concentrate heavy oxide ores.
a) III & IV
b) Only II
c) Only I
d) I, II & III

I. Ores are associated with non-metallic impurities
II. Ores are associated with rocky materials
III. Removal of impurities is known as concentration of ore.
IV. Ellingham diagram shows the stability of different metal oxides.
a) I, II, III & IV b
b) Only II
c) Only I
d) III & IV

What are the differences between minerals and ores?

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

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

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

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

What is metallurgy?

Why should we have a ecofriendly metallurgical process?

Name some elements that occur as native elements.

What is meant by concentration?

Can the same method of extraction be used for all metals.

Explain zone refining process with an example.

Using the Ellingham diagram,
(A) Predict the conditions under which
(i) Aluminium might be expected to reduce magnesia.
(ii) Magnesium could reduce alumina.
(B) it is possible to reduce Fe₂O₃ by coke at a temperature around 1200K

Give the uses of zinc.

Explain the electrometallurgy of aluminium.

Explain the following terms with suitable examples.
(i) Gangue
(ii) slag

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.

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

Give the limitations of Ellingham diagram.

Explain froth flotation, with diagram.

Explain concentration by magnetic separation with diagram.

In the extraction of copper, explain the smelting process.

Explain refining of nickel by mond's process