Q15 / 76 · NTA Abhyas (JEE Main) 2020 · Chemistry · General Principles and Processes of Isolation of Metals

Match the compound with the metal for which it is used for the process of extraction.

(i) NaCN                         (a) Titanium

(ii) Iodine                        (b) Aluminium

(iii) Cryolite                     (c) Silver ore

  • Correct answer
    A

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

  • B

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

  • C

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

  • D

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

Solution

(i) Role of NaCN in the extraction of silver is to do the leaching of silver ore in the presence of air from which the silver is obtained later by replacement 4Ag(s)+8C N − (aq)+2 H 2 O(aq)+ O 2 (g)→ Ag (CN) 2 − (aq)+4O H − (aq) 2 Ag (CN) 2 − (aq)+Zn(s)→2Ag(s)+ Zn (CN) 4 2− (aq)

(ii) Ti+ I 2 → Δ   TiI 4 → Δ Ti+ I 2 (Van-Arkel method)
(iii) In the metallurgy of aluminium, cryolite lowers the melting point of the mixture and improves the electrical conductivity of the cell.

Hence, the correct answer is option: 'A'.

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