Import Question JSON

Current Question (ID: 18529)

Question:

$\text{Aluminium is extracted from alumina } \text{Al}_2\text{O}_3 \text{ by electrolysis of a molten mixture of:}$

Options:

1. $\text{Al}_2\text{O}_3 + \text{HF} + \text{NaAlF}_4$
2. $\text{Al}_2\text{O}_3 + \text{CaF}_2 + \text{NaAlF}_4$
3. $\text{Al}_2\text{O}_3 + \text{Na}_3\text{AlF}_6 + \text{CaF}_2$
4. $\text{Al}_2\text{O}_3 + \text{KF} + \text{Na}_3\text{AlF}_6$

Solution:

$\text{HINT: Follow, Hall-Heroult process.}$ $\text{Explanation:}$ $\text{Alumina, } \text{Al}_2\text{O}_3, \text{ has a very high melting point (2072}^\circ\text{C). Therefore, it is always mixed with substances like fluorspar (}\text{CaF}_2\text{) and cryolite (}\text{Na}_3\text{AlF}_6\text{) before being subjected to the electrolysis.}$ $\text{These substances lower their melting point and increase their conductivity.}$

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
}