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Isolation of Elements question

2008 · Shift 1 · Q5
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Isolation of Elements question

2008 · Shift 1 · Q5

JEE AdvancedChemistryIsolation of ElementsMCQ+3 / −1
Native silver metal forms a water soluble complex with a dilute aqueous solution of NaCN in the presence of:
  1. A
    nitrogen
  2. B
    oxygen
  3. C
    carbon dioxide
  4. D
    argon
View written solutionFree

Correct answer: B

  1. Identify the process involved

    Native silver dissolves in dilute aqueous sodium cyanide by forming a soluble cyanide complex. This is the basis of the cyanide process used for extraction of silver and gold.

  2. Write the relevant reaction

    In presence of cyanide ion and oxygen, silver forms the soluble complex sodium argentocyanide:

    4Ag+8NaCN+O2+2H2O→4Na[Ag(CN)2]+4NaOH4Ag + 8NaCN + O_2 + 2H_2O \rightarrow 4Na[Ag(CN)_2] + 4NaOH4Ag+8NaCN+O2​+2H2​O→4Na[Ag(CN)2​]+4NaOH

    Thus, oxygen is essential for dissolution of silver in cyanide solution.

  3. Check the options

    • A: nitrogen — does not oxidize silver, so not correct.
    • B: oxygen — required in the cyanidation reaction, so correct.
    • C: carbon dioxide — not involved in forming the soluble silver cyanide complex.
    • D: argon — inert gas, not involved.

  4. Conclusion

    The required gas is oxygen.

  5. Comparison with stored answer

    Stored correct answer: B

    Derived answer: B

    They match.

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