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Metals and Non-Metals — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceMetals and Non-Metals5 Marks
Question
  1. Given below are the steps for extraction of copper from its ore. Write the reaction involved.
    1. Roasting of copper (1) sulphide.
    2. Reduction of copper (1) oxide with copper (1) sulphide.
    3. Electrolytic refining.
  2. Draw a neat and well labelled diagram for electrolytic refining of copper.
✓

Answer

  1. Given below are the steps.
  1. Roasting:
$2\text{Cu}_2\text{S(s) + 3O}_2\text{(g)}\xrightarrow{\text{heat}}2\text{Cu}_2\text{O(s) + 2SO}_2\text{(g)}$
  1. Reduction:
$2\text{Cu}_2\text{O(s) + Cu}_2\text{S(s)}\xrightarrow{\text{heat}}6\text{Cu}\text{(s) + SO}_2\text{(g)}$

This reaction in which one of the reactants ($Cu_2S$) carries the reduction of the product ($Cu_2O$) is known as auto-reduction.
  1. Reactions taking place in electrorefensing are:
At cathode (reduction): $Cu ^{2+}( aq )+2 e ^{-} \rightarrow Cu ( s )$

At anode (oxidation): $Cu ( s ) \rightarrow Cu ^{2+}( aq )+2 e ^{-}$
  1. For the diagram of electro-refining,

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