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NTA Abhyas NEET2020ChemistryGeneral Principles and Processes of Isolation of MetalsPractice

Match the following processes of metallurgy with their corresponding ore for which they are used:: (i) Froth floatation method (a) Germanium (ii) Electrolytic refining of metals (b) ZnS (iii) Zone refining of metals (c) Copper

Options

  1. A(i)-(c),(ii)-(a),(iii)-(b)
  2. B(i)-(b),(ii)-(c),(iii)-(a)
  3. C(i)-(a),(ii)-(c),(iii)-(b)
  4. D(i)-(a),(ii)-(b),(iii)-(c)

Correct answer

B. (i)-(b),(ii)-(c),(iii)-(a)

Step-by-step solution

(i) Froth floatation method : The method has been in use for removing gangue from sulphide ores. In this process, a suspension of the powered ore is made with water. To it, collectors and froth stabilisers are added. Collectors (e.g., pine oils, fatty acid, xanthates, etc.) enhance non-wettability of the mineral particles and froth stabilisers (e.g., Cresols, aniline) stabilise the froth. The mineral particles become wet by oils while the gangue particles by water. A rotating paddle agitates the mixture and draws a

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