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JEE Main20204 Sep 2020Morning ShiftChemistryGeneral Principles and Processes of Isolation of MetalsActual

Among statements (a) – (d), the correct ones are : (a) Lime stone is decomposed to CaO during the extraction of iron from its oxides. (b) In the extraction of silver, silver is extracted as an anionic complex. (c) Nickel is purified by Mond’s process. (d) Zr and Ti are purified by Van Arkel method.

Options

  1. A(a), (b), (c) and (d)
  2. B(a), (c) and (d) only
  3. C(b), (c) and (d) only
  4. D(c) and (d) only

Correct answer

A. (a), (b), (c) and (d)

Step-by-step solution

(a) During the extraction of Iron. at 900 – 1500   K (higher temperature range in the blast furnace), one of the processes taking place is: CaCO 3 → ∆ CaO + CO 2 Limestone is decomposed to CaO which removes silicate impurity of the ore as slag. The slag is in the molten state and separates out from iron. (b) Extraction of silver involves leaching the metal with cyanide ion: 4 Ag s + 8 CN – aq + 2 H 2 O aq + O 2 g → 4 Ag CN 2 – aq + 4 OH – aq The complex formed is negat

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