Extraction of Aluminium

Q.

Write the balanced equation for the following chemical reactions: Sodium + Water → Sodium hydroxide + Hydrogen

Q.

Write balanced equation for nitrogen monoxide and oxygen?

Q. Write the name and formulae of two ores for each of the following:
(a) iron
(b) zinc
(c) aluminium

Q. Element X is a metal with a valency 2. Element Y is a non-metal with a valency 3.
(a) Write equations to show how X and Y form ions.
(b) If Y is a diatomic gas, write the equation for the direct combination of X and Y to form a compound.
(c) Write two applications of electrolysis in which the anode diminishes in mass.
(d) If the compound formed between X and Y is melted and an electric current passed through the molten compound, the element X will be obtained at the _________ and Y at the __________ of the electrolytic cell. (Provide the missing words).

Q.

Electrolytic reduction of alumina to aluminium by the Hall-Heroult process is carried out _________

1. In the presence of NaCl

2. In the presence of fluorite

3. In the presence of cryolite which forms a melt with a lower melting temperature

4. In the presence of cryolite which forms a melt with a higher melting temperature

Q.

Aluminium oxide reacts with hot concentrated solution of sodium hydroxide to form:

1. sodium aluminate

2. aluminous hydroxide

3. aluminium hydride

4. sodium aluminate hydroxide

Q. The chemical formula of bauxite ore is ______.

1. $F{e}_2{O}_3$
2. $ZnC{O}_3$
3. $A{l}_2{O}_3.2H_{2}O$
4. $C{u}_{2}O$

Q.

Hydrogen will not reduce?

1. $\mathrm{CuO}$

2. ${\mathrm{Fe}}_3{\mathrm{O}}_4(\mathrm{Ferric}\mathrm{oxide})$

3. ${\mathrm{SnO}}_2$

4. ${\mathrm{Al}}_2{\mathrm{O}}_3$

Q.

During the electrolytic reduction of alumina, which of the following element is deposited at the cathode?

1. Graphite

2. Oxygen

3. Carbon dioxide

4. Aluminium

Q.

List some uses of aluminium in our everyday life.

Q. What is the role of cryolite (Na₃AlF₆) in the electrolytic reduction of alumina in the Hall's process?

Q.

In Bayer's process, what is used to convert impure bauxite to pure alumina?

1. NaOH

2. NaCl

3. NaF

4. Carbon

Q.

Write the chemical names of aluminum ores with their formulae.

Q.

Which metal is used for making foils used in packing of food materials?

1. Copper

2. Platinum

3. Aluminium

4. Sodium

Q. Which of the following elements is extracted commercially by the electrolysis of an aqueous solution of its compound?

1. Chlorine
2. Sulphur
3. Carbon
4. None of these

Q. During the electrolytic extraction of aluminium, purified alumina is mixed with $N{a}_{3}Al{F}_6$ and $Ca{F}_2$. Why?

Q.

Cryolite is added to alumina to reduce its:

1. boiling point

2. electrical conductivity

3. melting point

4. metallic lustre

Q.

Which solution is used with the bauxite to obtain sodium meta aluminate during the conversion of bauxite into alumina?

1. Conc. aluminium hydroxide

2. Conc. sodium hydroxide

3. Calcium hydroxide

4. Aluminium chloride

Q.

Which chemical process is used for obtaining a metal from its oxide? [3 MARKS]

Q.

which metal cation is the best oxidizing agent?

1. ${\mathrm{Pb}}^{2+}$

2. ${\mathrm{Cr}}^{3+}$

3. ${\mathrm{Fe}}^{2+}$

4. ${\mathrm{Sn}}^{2+}$

Q. In Hall's process the ore is leached by heating it with .

1. sodium carbonate
2. sodium bicarbonate
3. sodium hyroxide

Q.

State why aluminium is extracted from its oxide by electrolysis while copper, lead, iron by reducing agents and mercury and silver by thermal decomposition.

Q.

Explain in detail:

All methods of Extraction of Aluminum From Bauxite.

Q.

Nickel is purified by thermal decomposition of its __________

1. Hydride

2. Azide

3. Chloride

4. Carbonyl

Q.

You are given the description of a process called “Vapour phase refining” Vapour Phase Refining: This involves converting the crude metal into a volatile intermediate. This intermediate should also decompose on heating at a reasonable temperature. Which of the following could be categorized under ‘Vapour phase refining’?

1. Baeyer’s process

2. Mond’s Process

3. Mac-Arthur Forrest (Cyanide) process

4. Van Arkel de-Boer process

Q.

What is an ore? Where are the ores of metallic minerals?

Q. A metal M in nature find as sulphide ore is one of th good conductor of heat and electricity and is used in making electric wire .
A . Identify metal
B . Write balance equation involved in the process of extraction of metal.
C . Name the metal which not react with cold H2O and hot H20.

Q. Name the ore of zinc containing its sulphide.

Q. Name one metal each occurring as a
(a) sulphide ore
(b) halide ore
(c) carbonate ore
(d) oxide ore

Q. In Hall Heroult Process fluorspar is used to increase and powdered coke is used to reduce .

1. solubility
2. conductivity
3. heat loss
4. melting point