Import Question JSON

Current Question (ID: 18542)

Question:

$\text{What does copper matte contain?}$

Options:

1. $\text{Sulphides of copper(I), and iron(II)}$
2. $\text{Sulphides of copper (II), and iron(III)}$
3. $\text{Sulphides of copper(II), and iron(II)}$
4. $\text{Sulphides of copper(I), and iron(III)}$

Solution:

$\text{HINT: The chemical formula of copper matte is Cu}_2\text{S} + \text{FeS.}$ $\text{Explanation:}$ $\text{When copper ore is mixed with silica in a reverberatory furnace copper matte is produced.}$ $\text{The copper matte contains sulphide of copper(I) and iron(II).}$ $\text{Copper matte} \rightarrow \text{Cu}_2\text{S and FeS}$ $\text{Matte is a process in which copper is extracted before the final reduction.}$ $\text{When a hot blast of air is blown through a molten matte placed in a silica lined converter, FeS of the matte oxidizes to FeO.}$ $\text{The air is blown through the molten matte.}$ $\text{Blast of air converts Cu}_2\text{S partly into Cu}_2\text{O which reacts with remaining Cu}_2\text{S to give molten copper.}$

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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
}