Advertisements
Advertisements
प्रश्न
In electrolytic reduction of alumina _______ is used as a cathode.
विकल्प
sulphur
graphite
platinum
aluminium
उत्तर
In electrolytic reduction of alumina graphite is used as a cathode.
APPEARS IN
संबंधित प्रश्न
M is a metal above hydrogen in the activity series and its oxide has the formula M2O. This oxide when dissolved in water forms the corresponding hydroxide which is a good conductor of electricity. In the above context, answer the following:
1) What kind of combination exists between M and O?
2)How many electrons are there in the outermost shell of M?
3) Name the group to which M belongs.
4) State the reaction taking place at the cathode.
5) Name the product at the anode.
Give two uses of bronze.
How is manganese extracted from manganese dioxide, MnO2? Explain with the help of an equation.
Define the term mineral.
Name the chemical compound which is electrolysed in molten state to obtain aluminium metal. Which gas is evolved during this process?
What is the difference between a mineral and an ore?
Which metal is extracted from bauxite ore?
Which of the following reactants are used to carry out the thermite reaction required for welding the broken railway tracks?
(a) Al2O3 + Fe
(b) MnO2 + Al
(c) Fe2O3 + Al
(d) Cu2O + Fe
Give reasons, why aluminum is used in:
In making ships
Define the following term.
Gangue
Answer the following questions based on the extraction of aluminium from alumina by Hall - Heroult’s Process :
Why is powdered coke sprinkled on top of the electrolyte?
Define the term : Flux
Explain the following:
Galvanization protects iron from rusting.
Compare the properties of a typical metal and a non- metal on the basis of the following:
(a) electronic configuration
(b) nature of oxides
(c) oxidizing or reducing action
(d) conductivity of heat and electricity
Which one of the following is not true of metal :
Metal will have 1 or 2 or 3 electrons in their valence shell.
Zinc sulphide : Roasting : : zinc carbonate : _______
Which of the following metals exist in their native state in nature?
(i) Cu
(ii) Au
(iii) Zn
(iv) Ag
The given reaction shows one of the processes to extract the metals like Iron and Manganese.
\[\ce{MnO2(s) + Al(s) -> Mn(l) + Al2O3(s) + Heat}\]
Give the reason why the above reaction is known as a thermite reaction.
The given reaction shows one of the processes to extract the metals like Iron and Manganese.
\[\ce{MnO2(s) + Al(s) -> Mn(l) + Al2O3(s) + Heat}\]
Give a reason why Aluminium is preferably used in thermite reactions.
