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Science · 2026 · 4 marks
CBSE 2026 · Region 3 · Set 1 · Q28
Read the following passage and answer the questions that follow : An electrochemical process is used for refining metals by selectively dissolving and depositing them through electrolysis. Electrolytic refining is used for metals like Copper, Zinc, Tin, Nickel, Silver and Gold.(a)Define anode mud.(b)In electrolytic refining of copper, name the anode and the cathode.(c)With the help of chemical equations, show the extraction of copper from its ore $\displaystyle \mathrm{Cu}_{2} \mathrm{~S}$.(ii)Draw a neat and labelled diagram showing electrolytic refining of copper.
Read the following passage and answer the questions that follow : An electrochemical process is used for refining metals by selectively dissolving and depositing them through electrolysis. Electrolytic refining is used for metals like Copper, Zinc, Tin, Nickel, Silver and Gold.
(a)
Define anode mud.
(b)
In electrolytic refining of copper, name the anode and the cathode.
(c)
With the help of chemical equations, show the extraction of copper from its ore $\displaystyle \mathrm{Cu}_{2} \mathrm{~S}$.
(ii)
Draw a neat and labelled diagram showing electrolytic refining of copper.
Marking-scheme solution
(a) During electrolytic refining of a metal, the insoluble impurities which settle down at the bottom of the anode is called anode mud.
(b) Anode: Impure copper rod Cathode: Pure copper strip
(c) (i) \(\displaystyle 2 \mathrm{Cu}_{2} \mathrm{~S}+3 \mathrm{O}_{2}(\mathrm{~g}) \xrightarrow{\text { heat }} 2 \mathrm{Cu}_{2} \mathrm{O}(\mathrm{s})+2 \mathrm{SO}_{2}(\mathrm{~g})\)
\(\displaystyle 2 \mathrm{Cu}_{2} \mathrm{O}+\mathrm{Cu}_{2} \mathrm{~S} \xrightarrow{\text { heat }} 6 \mathrm{Cu}(\mathrm{s})+\mathrm{SO}_{2}(\mathrm{~g})\)
(Diagram- $\displaystyle 1$ mark, Labelling-$\displaystyle 1$ mark)
OR
(c) (ii)
(Diagram- $\displaystyle 1$ mark, Labelling-$\displaystyle 1$ mark)More from Metals and Non-metals
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CBSE Class 10 Science past-paper question from the 2026board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.