Advertisements
Advertisements
प्रश्न
When fused lead bromide is electrolysed, we observe ______.
पर्याय
A silver grey deposit at the anode and a reddish brown deposit at the cathode.
A silver grey deposit at the cathode and a reddish brown deposit at the anode.
A silver grey deposit at the cathode and reddish brown fumes at the anode.
Silver grey fumes at the anode and reddish brown fumes at the cathode.
उत्तर
When fused lead bromide is electrolysed, we observe a silver grey deposit at the cathode and reddish brown fumes at the anode.
APPEARS IN
संबंधित प्रश्न
Electrolysis of aqueous sodium chloride solution will form ________ at the cathode. (Hydrogen gas / Sodium metal)
A solution of HCl gas in water conducts electricity because ______, but a solution of HCl gas in toluene does not conduct an electric current because ______.
Name a non-metallic element which is a conductor of electricity.
Choosing only words from the following list, write down the appropriate words to fill in the blanks (a) to (e) below:
anions, anode, cathode, cations, electrode, electrolyte, nickel, voltameter.
The electroplating of an article with nickel requires an (a) ______ which must be a solution containing (b) ______ ions. The article to be plated is placed as the (c) ______ of the cell in which the plating is carried out. The (d) ______ of the cell is made from pure nickel. The ions that are attracted to the negative electrode and discharged are called (e) ______.
A solution of caustic soda (NaOH) in water or when fused, conducts an electric current. what is the similarity in these two cases?
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?
Give reasons as to why - the electrolysis of acidulated water is considered to be an example of catalysis.
Copper sulphate solution is electrolysed using copper electrodes.
Which electrode [cathode or anode] is the oxidizing electrode? Why?
Copper sulphate solution is electrolysed using copper electrodes.
Write the equation for the reaction occurring at the Anode electrode.
