Import Question JSON

Current Question (ID: 18894)

Question:

$\text{The fusion of chromite ore (FeCr}_2\text{O}_4\text{) with Na}_2\text{CO}_3\text{ in air gives a yellow solution upon the addition of water. Subsequent treatment with H}_2\text{SO}_4\text{ produces an orange solution.}$ $\text{The yellow and orange colours, respectively, are due to the formation of:}$

Options:

1. $\text{Na}_2\text{CrO}_4\text{ and Na}_2\text{Cr}_2\text{O}_7$
2. $\text{Cr(OH)}_3\text{ and Na}_2\text{Cr}_2\text{O}_7$
3. $\text{Cr}_2(\text{CO}_3)_3\text{ and Fe}_2(\text{SO}_4)_3$
4. $\text{Cr(OH)}_3\text{ and Na}_2\text{CrO}_4$

Solution:

$\text{HINT: Na}_2\text{CrO}_4\text{ is yellow in colour.}$ $\text{Explanation:}$ $\text{The reactions involved are as follows:}$ $\text{FeCr}_2\text{O}_4 + \text{Na}_2\text{CO}_3 \xrightarrow{\text{O}_2} \text{Na}_2\text{CrO}_4 + \text{Fe}_2\text{O}_3 + \text{CO}_2 \text{ (yellow)}$ $\text{Na}_2\text{CrO}_4 \xrightarrow{\text{H}^+} \text{Na}_2\text{Cr}_2\text{O}_7 \text{ (orange)}$ $\text{Hence, option first is the correct answer.}$

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
}