(i) Name the product formed at the anode during the electrolysis of acidified water using platinum electrodes.
(ii) Name the metallic ions that should be present in the electrolyte when an article made of copper is to be electroplated with silver.

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Solution

Answer (i)
An anode is a positive electrode terminal of the cell.
Water is a poor conductor of electricity but it also has some $H^{+}$ ions (hydrogen ions) and $O H^{-}$ ions (hydroxide ions) that are formed after the dissociation of water molecules. So we have to add acids like dilute Sulfuric acid to take out electrolysis.
The product formed at the anode during the electrolysis of acidified water using platinum electrodes is Oxygen $(O_{2})$ gas in the state.
Answer (ii)
The cathode is a negative terminal of the cell. The metallic ions that should be present in the electrolyte when an article made of copper is to be electroplated with silver $Ag$ are Silver ions ${Ag}^{+}$ which are solid in the state.

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Q. The following questions relate to the electroplating of an article with silver.
(a) Name the electrode formed by the article which is to be plated.
(b) What ions must be present in the electrolyte?
(c) What should be the nature of the anode?

(a) The observation seen when fused lead bromide is electrolysed is :

(i) A silver grey deposit at an anode and a reddish brown deposit at the cathode.

(ii) A silver grey deposit at the cathode and a reddish brown deposit at the anode.

(iii) A silver grey deposit at the cathode and reddish brown fumes at the anode.

(iv) Silver grey fumes at anode reddish brown fumes at the cathode.

(b) During electroplating an article with silver, the electrolyte used is :

(i) Silver nitrate solution

(ii) Silver cyanide solution

(iii) Sodium argentocyanide solution

(iv) Nickel sulphate solution.

(d) State your observation: At the cathode when acidified aqueous copper sulphate solution is electrolysed with copper electrodes.

(e) State which electrode: anode or cathode is the oxidising electrode. Give a reason for the same.

(f) Name the king of particle present in :

(i) Sodium hydroxide soln.

(ii) Carbonic acid

(iii) Sugar soln.

(g) $M_{2} O$ is the oxide of a metal 'M' which is above hydrogen in the activity series. $M_{2} O$ when dissolved in water forms the corresponding hydroxide which is a good conductor of electricity.

(i) State the reaction taking place at the cathode

(ii) Name the product at the anode.

(a) Give reason: The electrolysis of acidulated water is considered to be an example of catalysis.

(b) During the electrolysis of copper [II] sulphate solution using platinum as cathode and carbon as anode

(i) State what you observe at the cathode and at the anode

(ii) State the change noticed in the electrolyte

(iii) Write the reactions at the cathode and at the anode.

Q. A copper sheet is electroplated with nickel i) Name the anode used, ii) Name the cathode used, iii) Name the ions present in electrolyte iv) Name the ions that move to the cathode v) What will be the product formed at the anode

Q. Name the anode and the electrolyte used during electroplating of an article with copper. What type of reaction is taking place at the anode?

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(i) Name the product formed at the anode during the electrolysis of acidified water using platinum electrodes.(ii) Name the metallic ions that should be present in the electrolyte when an article made of copper is to be electroplated with silver.

(i) Name the product formed at the anode during the electrolysis of acidified water using platinum electrodes.
(ii) Name the metallic ions that should be present in the electrolyte when an article made of copper is to be electroplated with silver.