Advertisements
Advertisements
प्रश्न
In electrolytic reduction of alumina _______ is used as a cathode.
पर्याय
sulphur
graphite
platinum
aluminium
Advertisements
उत्तर
In electrolytic reduction of alumina graphite is used as a cathode.
APPEARS IN
संबंधित प्रश्न
Name two metals which are found in nature in the free state.
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.
Explain giving equation, what happens when:
A mixture of Cu2O and Cu2S is heated.
Name the metal which is extracted from haematite ore.
Name one ore of aluminium. Name the aluminium compound present in this ore and write its chemical formula.
The metal which can be extracted simply by heating the cinnabar ore in air is ______.
A metal which exists as a liquid at room temperature is obtained by heating its sulphide ore in the presence of air.
- Name the metal and write its chemical symbol.
- Write the name and formula of the sulphide ore.
- Give the equations of chemical reactions involved in the production of metal from its sulphide ore.
- Name a common device in which this metal is used.
- Can this metal displace copper from copper sulphate solution? Why?
In an electrolytic tank, aluminium metal is being extracted by the electrolysis of molten aluminium oxide using carbon electrodes. It is observed that one of the carbon electrodes is gradually burnt away and has to be replaced.
- Which carbon electrode (cathode or anode) is burnt away?
- Why is this carbon electrode burnt away?
State one observation for each of the following :
Copper sulphate solution is electrolysed using copper electrodes.
Give the chemical formula of :
Bauxite
Name the following:
Two metals which are found in the free or native state.
Compare the process of calcination and roasting.
Complete the incomplete statement with missing word:
Metals form positive ions while non- metals ______.
Name the following:
The process of heating an ore to a high temperature in the presence of air.
Which one of the following is not true of metal :
Metal will have 1 or 2 or 3 electrons in their valence shell.
Right or wrong sentence?
The electrolysis of alumina combines fluorite and cryolite to increase the solubility in the precipitation method.
Write the molecular formulae of the following compound.
Fluorspar
Explain the concept of Calcination.
Explain the following reaction with the balanced equation.
Zinc carbonate is heated strongly in limited supply of air
Electrical wires have a coating of an insulting material. The material, generally used is
