Wolframite ore is separated from tinstone by the process of________.

Which one of the following ores is best concentrated by froth – floatation method?

Which of the following is not a mineral of aluminium?

In the extraction of copper from its sulphide ore, the metal is finally obtained by the reduction of cuprous oxide with________.

In Hall-Heroult process___________act as an anode.

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

Identify the correct statement with respect to the following reaction
\({ Zn }_{ (g) }+2\left[ Au\left( CN \right) _{ 2 } \right] _{ (aq) }^{ - }\longrightarrow \left[ Zn(CN)_{ 4 } \right] _{ 2(aq) }^{ - }+{ 2Au }_{ (s) }\)
a) The above reaction takes place in extraction of zinc.
b) Gold is reduced to its elemental state.
c) The process is called ammonia leaching.
d) The above reaction is an example of cyanide leaching.
a) III & IV
c) Only I
b) II &IV
d) I, II, III & IV

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: Galvanising is the process of coating iron and steel with metallic zinc.
Reason: Highly resistant to rusting and corrosion.
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

a) Germanium is used as an semi conductor
b) Stainless steel is an important alloy of Aluminum
c) Zinc sulphide is used in making luminous paints.
d) Brass an alloy of zinc is used in water valves

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

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

Name some depressing agents.

Define roasting.

Explain the electrometallurgy of aluminium.

How is acid leaching done for the sulphide ores?

What is liquation?

Give the limitations of Ellingham diagram.

How can you separate alumina from silica in a bauxite ore.