Advertisements
Advertisements
Question
Draw a well-labelled diagram of extraction of Aluminium. Write the anode reaction in electrolytic reduction of Alumina.
Advertisements
Solution
At anode: \[\ce{2O^{2-} -> O2 + 4e-}\]
APPEARS IN
RELATED QUESTIONS
Which of the following pairs will give displacement reactions?
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.
Which metal becomes black in the presence of hydrogen sulphide gas in air?
Name the gas in air which tarnishes silver articles slowly.
How is manganese extracted from manganese dioxide, MnO2? Explain with the help of an equation.
Name one ore of aluminium. Name the aluminium compound present in this ore and write its chemical formula.
During galvanisation, iron metal is given a thin coating of one of the following metals. This metal is:
(a) chromium
(b) tin
(c) zinc
(d) copper
The metal which can be extracted from pyrolusite ore is:
(a) mercury
(b) manganese
(c) aluminium
(d) magnesium
Which metal can be extracted from the following ore?
Calamine
Compare the process of calcination and roasting.
What is galvanized iron.
Correct the following statement :
Copper reacts with nitric acid to produce nitrogen dioxide.
Write the name.
The molecular formula of main ore of aluminium –
The electrolysis of alumina involves the use of fluorspar and cryolite to increase the melting point.
Write the molecular formulae of the following compound.
Cryolite
Explain the concept of Roasting.
Explain in brief types of extraction of less reactive metals according to their reactivity.
Explain Bayer’s process of concentration of bauxite with a chemical equation.
2 mL each of concentrated HCl, HNO3 and a mixture of concentrated HCl and concentrated HNO3 in the ratio of 3 : 1 were taken in test tubes labelled as A, B and C. A small piece of metal was put in each test tube. No change occurred in test tubes A and B but the metal got dissolved in test tube C respectively. The metal could be
