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Question
Name the following :
The compound formed by the reaction between calcium oxide and silica.
Solution
Slag
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RELATED QUESTIONS
Write the equation for the reaction that occurs at the cathode during the extraction of aluminum by electrolysis.
Name the process by which the refining of aluminium is done ?
In order to obtain 1 tonne of aluminium, the following inputs are required: 4 tonnes of bauxite, 150 kg of sodium hydroxide and 600 kg of graphite. The aluminium compound in bauxite is aluminium oxide and the main impurity is iron (III) oxide. Aluminium is obtained by the electrolysis of aluminium oxide dissolved in cryolite.
- Write the formula of cryolite.
- Write down the word which correctly completes the following sentence.
By dissolving aluminium oxide in cryolite, a ______ (conducting/non-conducting) solution is produced. - Why is so much graphite required for the electrolytic process?
- Write the equation for the reaction which takes place at the cathode.
- What is cathode made up of?
Name the following:
The materials used as electrodes in the electrolytic extraction of aluminium.
Aluminium is a more active metal than iron, but suffers less corrosion. Why?
For the substance listed below, explain its role in the extraction of aluminium: Cryolite
The following question relate to the extraction of aluminium by electrolysis.
Explain why is it necessary to renew the anode periodically.
Explain why :
Iron sheets are coated with zinc during galvanization.
Explain why it is preferably to use a number of graphite electrodes as anode instead of a single electrode, during the above electrolysis.
State the relevant reason for the following:
Graphite anodes are continuously replaced during the electrolysis of alumina.
