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Electrolysis — Chemistry STD 10 — Question

ICSE BoardEnglish MediumSTD 10ChemistryElectrolysis3 Marks
Question
(i) Here is an electrode reaction:
Cu → Cu2+ + 2e-
At which electrode (anode or cathode) would such a reaction take place? Is this an example of oxidation or reduction?
(ii) A solution contains magnesium ions (Mg2+), iron (II) ions (Fe2+) and copper ions (Cu2+). On passing an electric current through this solution, which ions will be the first to be discharged at the cathode? Write the equation for the cathode reaction.
(iii) Why is carbon tetrachloride, which is a liquid, a non-electrolyte?
✓

Answer

(i) This reaction will take place at the anode of electrolytic cell. This reaction is an example of oxidation of copper atom to copper ion.
(ii) The copper ions will discharge first
Cu2++ 2e- → Cu
(iii) Carbon tetrachloride is a covalent compound and has no free cations and anions which are responsible for the conduction of electric current.

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