Chemistry
Give reasons why:
(i) Sodium Chloride will conduct electricity only in fused or aq. soln. state.
(ii) In the electroplating of an article with silver, the electrolyte sodium argentocyanide soln. is preferred over silver nitrate solution.
(iii) Although copper is a good conductor of electricity, it is a non-electrolyte.
Electrolysis
ICSE 2016
68 Likes
Answer
(i) The ions Na+ and Cl– are not free but held together by strong electrostatic force of attraction. In fused or molten state the ions break free and move. Hence, NaCl will conduct electricity only in fused state or aq. soln. state.
(ii) Migration of Ag1+ ions from sodium argentocyanide solution is slow compared to that from silver nitrate. Hence, an even deposition of metal silver is obtained on the article. Therefore, the electrolyte sodium argentocyanide soln. is preferred over silver nitrate solution.
(iii) Copper does not undergo chemical decomposition due to flow of electric current through it. Hence, copper is a good conductor of electricity but it is a non-electrolyte.
Answered By
41 Likes
Related Questions
Name:
(i) the product formed at the anode – during electrolysis of acidified water using platinum electrodes.
(ii) the metallic ions that should be present – in the electrolyte when an article made of copper is to be electroplated with silver.
Write equations for the reactions taking place at the two electrodes during the electrolysis of:
(i) Acidified CuSO4 solution with copper electrodes.
(ii) Molten PbBr2 with inert electrodes. (mention clearly the name of the electrode in each case)
State the observations at the anode & at the cathode during the electrolysis of –
(i) Fused lead bromide using graphite electrodes.
(ii) Copper sulphate solution using copper electrodes.
Identify the substance underlined, in each of the following —
(i) The electrolyte used for electroplating an article with silver.
(ii) The particles present in a liquid such as kerosene, that is a non-electrolyte.