Import Question JSON

Current Question (ID: 18492)

Question:

$\text{Which of the following ores can be reduced by carbon?}$ $\text{a. Haematite}$ $\text{b. Zincite}$ $\text{c. Iron pyrites}$ $\text{d. Sphalerite}$ $\text{Choose the correct option:}$

Options:

1. $\text{a and b}$
2. $\text{b and c}$
3. $\text{c and d}$
4. $\text{a and d}$

Solution:

$\text{HINT: Oxide ore can be reduced by carbon.}$ $\text{Explanation:}$ $\text{STEP 1: In the metallurgical process, the oxide ores are reduced by carbon.}$ $\text{Sulphide ore cannot be reduced by carbon.}$ $\text{Here, haematite (Fe}_2\text{O}_3\text{) and zincite (ZnO) are oxide ores of iron and zinc}$ $\text{respectively while iron pyrites (FeS}_2\text{) and sphalerite (ZnS) are sulphide}$ $\text{ores of iron and zinc respectively.}$ $\text{STEP 2: The reactions involved are:}$ $2\text{Fe}_2\text{O}_3(s) + 3\text{C}(s) \rightarrow 4\text{Fe}(s) + 3\text{CO}_2(g)$ $\text{ZnO}(s) + \text{C}(s) \rightarrow \text{Zn}(g) + \text{CO}(g)$ $\text{Therefore, haematite and zincite can be reduced by carbon.}$

Import JSON File

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
}