Metallurgy of aluminium - class-X
Description: metallurgy of aluminium | |
Number of Questions: 46 | |
Created by: Supriya Thakkar | |
Tags: principles and processes of isolation of elements industrial inorganic chemistry periodic classification of elements chemistry materials production of metals metallurgy |
In the upper layers of the earth, that is, in the crust, the most abundant metal is:
(a) Roasting and calcination are the two processes to reduce the metal oxides to the respective metals.
(b) Magnesium is extracted from its ore by electrolytic reduction process.
(c) Cryolite is used in metallurgy of aluminium in order to increase the fusibility and conductivity
(d) I Hall's process bauxite is leached with the help of ${Na} _{2}{CO} _{3}$.
Which of the following options regarding the above statements is correct?
State the function of fluorspar in the metallurgy of aluminium.
State the function of cryolite?
The electrolyte used in electrolytic refining of impure aluminium is __________.
In the electrolytic reduction of alumina, the electrolyte is covered with coke powder because, it __________.
A layer of coke is spread over bauxite during extraction of aluminium. This act as a/an
Aluminum is used for making cooking utensils. which of the following propertis of aluminium are responsible for the same ?
(i) Good thermal conductivity ctrical conductivity
(ii) Good electrical conductivity
(iii) Ductillity
(iv) High melting point
The mass of carbon anode consumed (giving of carbon dioxide) in the production of $270 \ kg$ aluminium metal bum bauxite by Hall process is: (Atomic mass $Al = 27$)
In case of Hall's process applied on reduction of $Al _2O _3$ to Al can be done by using:
Function of adding cryolite in the extraction of aluminium from pure alumina is?
Aluminium is extracted by the electrolysis of:
Which of the following is / are involved in extraction of aluminium from bauxite?
Aluminium is obtained by.
All the statements are correct.
(i) In gold Schmidt thermite process aluminium acts as a reducing agent
(ii) Mg is extracted by electrolysis of aq. solution of $MgCl _{2}$
(iii) Extraction of Pb is possible by smelting
(iv) Red bauxite is purified by Serpeck's Method
The cathode used in the electrolytic cell during aluminium extraction is made of ____________.
The constituents of the electrolyte for the extraction of aluminium is ____________.
Cryolite, $Na 3AlF _6$ is added to $Al _2O _3$ in Hall-Heroult process to ___ m.p. and to ___________ electrical conductivity.
A layer of coke is spread over bayzite during extraction of aluminium. This acts as an ____________.
In the electrolysis of alumina, cryolite is added to ______________.
Cryolite is added to alumina as to lower the fusion temperature and make the mass good conductor of electricity.
Identify the process to which the following reaction belongs :
$\displaystyle { Al } _{ 2 }{ O } _{ 3 }.{ 2H } _{ 2 }O+{ Na } _{ 2 }{ CO } _{ 3 }\longrightarrow { 2NaAlO } _{ 2 }+{ 2H } _{ 2 }O+{ CO } _{ 2 }$
$\displaystyle { 2NaAlO } _{ 2 }+{ 2H } _{ 2 }O+{ CO } _{ 2 } \underrightarrow { 50-{ 60 }^{ o }C } { Al } _{ 2 }{ O } _{ 3 }.{ 2H } _{ 2 }O+{ Na } _{ 2 }{ CO } _{ 3 }$
How many aluminum smelting plants are there in India?
Which of the following statement(s) is/are correct"?
Aluminium is extracted from alumina $(Al _2O _3)$ by electrolysis of a molten mixture of:
Aluminium is extracted from alumina $(Al _2O _3)$ by electrolysis.
Impure bauxite on reaction with $NaOH$ gives _____________.
In the electrolytic reduction of alumina, the electrolyte is covered with coke powder because, if :
Aluminium is extracted by :
The electrolyte used in electrolytic refining of impure aluminium is:
$NaAlO 2$ on hydrolysis gives ________.
During electrolysis of aluminium, which of the following substance is used as an electrolyte?
Anodic product in the electrolytic reduction of alumina:
The most abundant metal in the earths crust is:
Aluminium is extracted mainly from its principal ore :
Which of the following statements is correct?
(i) Copper is extracted by hydrometallurgy from low-grade ores.
(ii) In the electrolytic reduction of alumina, graphite is acting as an anode and steel vessel with the lining of carbon acts as an anode.
(iii) In Hall-Heroult process, aluminium is obtained at anode and CO and $CO _2$ are produced at the cathode.
Cryolite and fluorspar are mixed with $Al _2O _3$ during electrolysis for extraction of aluminium to:
In the metallurgy of aluminium:
Purification of aluminium by electrolytic refining is called:
In the extraction of aluminium,
Process X: applied for red bauxite to remove iron oxide (chief impurity)
Process Y: applied for white bauxite to remove Z (chief impurity).
Identity the principle behind the concentration of bauxite ore.
In electrtolysis of $Al _2O _3$ by Hall-Heroult process:
Which one of the following statements is incorrect?
A compound added to lower the fusion temperature of the electrolytic bath in the extraction of Al is ___________.