Advertisements
Advertisements
Question
If a fused metallic chloride is electrolyzed, at which electrode would the metal be obtained?
Solution
When a fused metallic chloride is electrolyzed, the metal is obtained at cathode.
APPEARS IN
RELATED QUESTIONS
Identify the substance underlined, in the following case
The particles present in a liquid such as kerosene, that is a nonelectrolyte.
State your observation At the cathode, when acidified aqueous copper sulphate solution is electrolysed with copper electrodes.
State one relevant observation for the following:
At the anode, when molten lead bromide is electrolyzed using graphite electrodes.
Name a non-metallic element which is a conductor of electricity.
What are the particles present in a compound which is a non- electrolyte?
What should be the physical state of lead bromide if it is to conduct electricity?
The following is an extract from metals in the service of man, Alexander and street /Pelican 1976': Alumina (aluminium oxide) has a very high melting point over 2000oC, so that I cannot readily be liquefied. However, conversion of alumina to aluminium and oxygen, by electrolysis, an occur when it is dissolved in some other substance.
(a) Which solution is used to react with bauxite as first step in obtaining pure aluminium oxide?
(b) The aluminium oxide for the electrolytic extraction of aluminium is obtained by heating aluminium hydroxide. Write the equation for this reaction.
(c) Name the element which serves both as the anode and the cathode in the extraction of aluminium.
(d) Write the equation for the reaction that occurs at the cathode during the extraction of aluminium.
(e) Write the equation for the reaction that occurs at the cathode during extraction of aluminium by electrolysis.
(f) Give the equation for the reaction that occurs at the anode when aluminium is purified by electrolysis.
The following is a sketch of an electrolytic cell used in the extraction of aluminium:
- What is the substance of which the electrodes A and B are made?
- At which electrode (A or B) is aluminium formed?
- What are the two aluminium compounds in the electrolyte C?
- Why is it necessary for electrode B to be continuously replaced?
A metal article is to be electroplated with silver. The electrolyte selected is sodium argentocyanide.
- What kind of salt is sodium argentocyanide?
- Why is it preferred to silver nitrate as an electrolyte?
- State one condition to ensure that the deposit is smooth, firm and long lasting.
- Write the reaction taking place at the cathode.
- Write the reaction taking place at the anode.
M is a metal above hydrogen in the activity series and its oxide has the formula M2O. The oxide when dissolved in water forms the corresponding hydroxide which is a good conductor of electricity. In the above context answer the following:
- What kind of combination exists between M and O?
- How many electrons are there in the outermost shell of M?
- Name the group to which M belongs.
- State the reaction taking place at the cathode.
- Name the product at the anode.