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प्रश्न
When fused lead bromide is electrolyzed we observe
विकल्प
A silver grey deposit at anode and a reddish brown deposit at cathode
A silver grey deposit at cathode and reddish brown deposit at anode
A silver grey deposit at cathode and reddish brown fumes at anode
Silver grey fumes at anode and reddish brown fumes at cathode
उत्तर
A silver grey deposit at the cathode and reddish brown fumes at the anode.
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संबंधित प्रश्न
Amongst the OH- ions and Br- ions which are likely to discharge first?
What are the particles present in a compound which is a non- electrolyte?
If HX is a weak acid, what particles will be present in its dilute solution apart from those of water?
Explain, why solid sodium chloride does not allow electricity to pass through?
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.
Here is an electrode reaction:
\[\ce{Cu -> Cu^{2+} + 2e^-}\]
At which electrode (anode or cathode) would such a reaction take place? Is this an example of oxidation?
Give reasons as to why - the electrolysis of acidulated water is considered to be an example of catalysis.
Give reasons why sodium chloride will conduct electricity only in the fused or aqueous solution state.
Give reasons why in the electroplating of an article with silver, the electrolyte sodium argentocynide solution is preferred over silver nitrate solution.
Classify the following substance:
Dilute hydrochloric acid
