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4. d and f- block elements — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistry4. d and f- block elements1 Mark
MCQ
Native silver metal forms a water soluble complex with a dilute aqueous solution of $\mathrm{NaCN}$ in the presence of
  • A
    nitrogen
  • ✓
    oxygen
  • C
    carbon dioxide
  • D
    argon
✓

Answer

Correct option: B.
oxygen
b
$\mathrm{Ag}$ dissociates in a solution of $\mathrm{NaCN}$ in the presence of air, and forms sodium argentocyanide.

$4 \mathrm{Ag}+8 \mathrm{NaCN}+2 \mathrm{H}_2 \mathrm{O}+\mathrm{O}_2 \longrightarrow 4 \mathrm{Na}\left[\mathrm{Ag}(\mathrm{CN})_2\right]+4 \mathrm{NaOH}$

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