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AP EAMCET201923 Apr 2019Morning ShiftChemistryGeneral Principles and Processes of Isolation of MetalsActual

Identify the correct statements from the following: i. In the extraction of ( Ag ) and ( Au ), zinc is used as reducing agent. ii. Impure zinc can be refined by distillation method. iii. Malachite is an ore of nickel.

Options

  1. Ai, ii, iii
  2. Bi, iii only
  3. Cii, iii only
  4. Di, ii only

Correct answer

D. i, ii only

Step-by-step solution

The explanations of given statements are as follows: (i) In the extraction of ( Ag ) and ( Au ), zinc is used as reducing agent. ( array r 2 [ Ag ( CN )₂ ](a q)+ Zn (s) 2 Ag (s)+ [ Zn ( CN )₄ ]²⁻(a q) array ) Thus, statement (i) is correct. (ii) Impure zinc can be refined by the process of distillation. Thus, statement (ii) is correct. (iii) Malachite, ( [ Cu ₂ ( CO ₃ )( OH )₂ ] ) is an ore of copper. Thus, statement (iii) is incorrect. Hence, correct option is (d).

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