Advertisements
Advertisements
प्रश्न
In electrolytic reduction of alumina _______ is used as a cathode.
पर्याय
sulphur
graphite
platinum
aluminium
उत्तर
In electrolytic reduction of alumina graphite is used as a cathode.
APPEARS IN
संबंधित प्रश्न
What iron compound is present in haematite ore? Also write its chemical formula.
Name the electrode at which aluminium metal is produced.
Which of the following metals can be obtained from haematite ore?
(a) copper
(b) sodium
(c) zinc
(d) iron
A metal which exists as a liquid at room temperature is obtained by heating its sulphide ore in the presence of air.
(a) Name the metal and write its chemical symbol.
(b) Write the name and formula of the sulphide ore.
(c) Give the equations of chemical reactions involved in the production of metal from its sulphide ore.
(d) Name a common device in which this metal is used.
(e) Can this metal displace copper from copper sulphate solution? Why?
An element has its electron configuration as 2,8,8,2. Now answer the following questions.
a) What is the atomic number of this element?
b) What is the group of this element?
c) To which period does this element belong?
Identify the process given in following passage and draw neat labelled diagram showing the process.
Electrolysis of molten mixture of alumina (melting point > 20000C) is done in a steel tank. The tank has a graphite lining on the inner side. This lining does the work of a cathode. A set of graphite rods dipped in the molten electrolyte works as anode. Cryolite (Na3AlF6) and fluorspar (CaF2) are added in the mixture to lower its melting point upto 10000C.
Define the following term.
Mineral
Name:
The allotrope of the non-metal carbon which conducts electricity.
To protect iron from rusting, it is coated with a thin layer of zinc. Name the process.
Which one of the following is not true of metal :
Metals are malleable and ductile
Which one of the following is not true of metal :
Metal will have 1 or 2 or 3 electrons in their valence shell.
Choose the correct answer from the options given below:
The metal is a liquid at room temperature.
Answer the following question:
Carbon cannot reduce the oxides of sodium, magnesium, and aluminum to their respective metals. Why? Where are these metals placed in the reactivity series? How are these metals obtained from their ores? Take an example to explain the process of extraction along with chemical equations.
If Cu, Fe, Zn, Al elements are arranged in increasing order of their reactivity then the correct order would be which of the following?
Aluminium oxide is _______ oxide.
Extraction of moderately reactive elements is done by _______ and _______ method.
Find the odd one out and give its explanation.
In the electrolytic reduction of alumina, the lining of graphite acts as an anode.
Explain the concept of Roasting.
In thermite welding a mixture of ____________ is ignited with a burning magnesium ribbon which produces molten iron metal as a large amount of heat is evolved.
