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Current Question (ID: 18525)

Question:

$4 ext{M} + 8 ext{CN}^- + 2 ext{H}_2 ext{O} + ext{O}_2 \rightarrow 4[ ext{M(CN)}_2]^- + 4 ext{OH}^-$ $2[ ext{M(CN)}_2]^- + ext{Zn} \rightarrow [ ext{Zn(CN)}_4]^{2-} + 2 ext{M}$ $\text{The metal M in above-mentioned reaction is:}$

Options:

1. $\text{Nickel}$
2. $\text{Silver}$
3. $\text{Copper}$
4. $\text{Mercury}$

Solution:

$\text{HINT: Silver and Gold metal are extracted using leaching process.}$ $\text{Explanation:}$ $\text{Leaching Process: Extraction of gold and silver involves leaching the metal with } \text{CN}^-. \text{ This also an oxidation reaction because } \text{Ag} \rightarrow \text{Ag}^+. \text{ The metal is later recovered by dispacement method.}$ $\text{The reaction is as follows:}$ $4\text{M} + 8\text{CN}^- + 2\text{H}_2\text{O} + \text{O}_2 \rightarrow 4[\text{M(CN)}_2]^- + 4\text{OH}^-$ $2[\text{M(CN)}_2]^- + \text{Zn} \rightarrow [\text{Zn(CN)}_4]^{2-} + 2\text{M}$ $\text{Here M is Ag and Au}$

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Upload a JSON file containing LaTeX/MathJax formatted question, options, and solution.

Expected JSON Format:

{
  "question": "The mass of carbon present in 0.5 mole of $\\mathrm{K}_4[\\mathrm{Fe(CN)}_6]$ is:",
  "options": [
    {
      "id": 1,
      "text": "1.8 g"
    },
    {
      "id": 2,
      "text": "18 g"
    },
    {
      "id": 3,
      "text": "3.6 g"
    },
    {
      "id": 4,
      "text": "36 g"
    }
  ],
  "solution": "\\begin{align}\n&\\text{Hint: Mole concept}\\\\\n&1 \\text{ mole of } \\mathrm{K}_4[\\mathrm{Fe(CN)}_6] = 6 \\text{ moles of carbon atom}\\\\\n&0.5 \\text{ mole of } \\mathrm{K}_4[\\mathrm{Fe(CN)}_6] = 6 \\times 0.5 \\text{ mol} = 3 \\text{ mol}\\\\\n&1 \\text{ mol of carbon} = 12 \\text{ g}\\\\\n&3 \\text{ mol carbon} = 12 \\times 3 = 36 \\text{ g}\\\\\n&\\text{Hence, 36 g mass of carbon present in 0.5 mole of } \\mathrm{K}_4[\\mathrm{Fe(CN)}_6].\n\\end{align}",
  "correct_answer": 4
}