Home › Maharashtra SSC (Class 10) › Chemistry › Metallurgy › Which method is used to obtain pure metals from …
Which method is used to obtain pure metals from the impure metals got after reduction?
AElectrolysis
BRoasting
CCalcination
DLeaching
Answer & Solution
Correct answer: A. Electrolysis
1. Metals obtained by reduction still contain impurities.
2. These impurities must be removed to get pure metal, a step called refining.
3. The electrolysis (electrolytic) method is used for this refining.
4. Roasting and calcination are ore-treatment steps, not refining of the metal, so they are wrong.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 8 "Metallurgy", p.114_
Related questions
Germanium and silicon used as semiconductors are purified by zone refining becauseNickel is refined by heating the impure metal in a stream of CO to form a volatile carbonyFrom an Ellingham diagram at 1500 K, $\Delta G^\circ$ for $2Fe+O_2\rightarrow 2FeO$ is $-3From an Ellingham diagram, aluminium can reduce which of the following oxides?In an Ellingham diagram the line for the formation of carbon monoxide ($2C + O_2
ightarroAn Ellingham diagram is a plot ofIn the cyanide process, gold is recovered from the leached solution $[Au(CN)_2]^-$ by addiIn the electrolytic refining of copper, the anode and cathode are respectively