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Metals and Non-Metals — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceMetals and Non-Metals1 Mark
MCQ
Metals are refined by using different methods. Which of the following metals are refined by electrolytic refining?
  1. $\ce{Au}$
  2. $\ce{Cu}$
  3. $\ce{Na}$
  4. $\ce{K}$
  • ✓
    $1$ and $2$
  • B
    $1$ and $3$
  • C
    $2$ and $3$
  • D
    $2$ and $4$
✓

Answer

Correct option: A.
$1$ and $2$
Alkali metals are very reactive so cannot refine with the help of electrolytic refining process.
Electrolytic refining is used for metals like $\ce{Cu, Zn, Ag, Au}$ etc. The method to be used for refining an impure metal depends on the nature of the metals well as on the nature of impurities present in it. So, metals $\ce{Au}\ ($gold$)$ and $\ce{Cu}\ ($copper$)$ are refined by electrolytic refining.

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