Import Question JSON

Current Question (ID: 18528)

Question:

$\text{In the extraction of aluminium by the Hall-Heroult process, purified } \text{Al}_2 \text{O}_3 \text{ is mixed with } \text{CaF}_2 \text{ to:}$ $\text{a. Lower the melting point of } \text{Al}_2 \text{O}_3$ $\text{b. Increase the conductivity of the molten mixture.}$ $\text{c. Reduce } \text{Al}^{3+} \text{ into } \text{Al(s)}$ $\text{d. Act as a catalyst}$ $\text{Choose the correct option:}$ $\text{1. a and b}$ $\text{2. b and c}$ $\text{3. c and d}$ $\text{4. a and d}$

Options:

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

Solution:

$\text{HINT: CaF}_2 \text{ makes alumina a good conductor of electricity.}$ $\text{Explanation:}$ $\text{In the metallurgy of aluminium } \text{Al}_2\text{O}_3 \text{ is mixed with } \text{Na}_3\text{AlF}_6 \text{ and } \text{CaF}_2$ $\text{which causes following affects.}$ $\text{(i) Lower the melting point of Al}_2\text{O}_3,$ $\text{(ii) Increase the conductivity of molten mixture}$

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
}