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प्रश्न
How is impure copper purified by electrolysis ? Explain.
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उत्तर
Electrolytic refining is used for the purification of copper. In this case
Cathode : Pure copper strip
Anode : Impure copper
Electrolyte : A solution of copper sulphate and dilute sulphuric acid.
When the current is passed through the electrolyte , the copper ions of the copper sulphate solution are attracted to the cathode where they gain electrons and are deposited on pure copper strips. The impure copper loses electrons and passes into solution as soluble copper ions.
At Cathode : Cu+2 + 2e- → Cu
At anode : Cu + 2e- → Cu+2
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संबंधित प्रश्न
Identify the substance underlined, in the following case
The electrolyte used for electroplating an article with silver.
Give reasons why In the electroplating of an article with silver, the electrolyte sodium argentocyanide solution is preferred over silver nitrate solution.
Give one word or phrase for the following:
Electrolytic deposition of a superior metal on a baser metal.
State the electrode reaction at the anode during electrolysis of:
Aqueous copper sulphate solution.
List out the main applications of electrolysis.
The following question relate to the electroplating of an article with silver.
What ions must be present in the electrolyte?
The following question relate to the electroplating of an article with silver.
What should be the nature of the anode?
Mr Ramu wants electrolyte his key chain with nickel to prevent rusting. For this electroplating
(i) Name the electrolyte
(ii) Name the cathode
(iii) Name the anode
(iv) Give the reaction at the cathode
(v) Give the reaction at the anode
Draw a labelled diagram to show how iron is electroplated with copper.
Which solution is preferred as electrolyte, CuSO4 or FeSO4?
