Import Question JSON

Current Question (ID: 18898)

Question:

$\text{CrO}_4^{2-} \text{ (yellow) changes to } \text{Cr}_2\text{O}_7^{2-} \text{ (orange) in pH } = x \text{ and vice versa in pH } = y.$ $\text{The value of } x \text{ and } y \text{ will be:}$

Options:

1. $6, \text{ and } 8$
2. $6, \text{ and } 5$
3. $8, \text{ and } 6$
4. $7, \text{ and } 7$

Solution:

$\textbf{HINT:} \text{ Chromate converts into dichromate in an acidic medium.}$ $\textbf{Explanation:}$ $\text{The conversion of Chromates to dichromates or vice versa is pH-dependent.}$ $\text{The chromate is converted into dichromate in an acidic medium.}$ $\text{The pH is required for this conversion is 6.}$ $\text{The conversion of dichromate to chromate or vice versa is pH-dependent.}$ $\text{The dichromate is converted into chromate in a basic medium.}$ $\text{The pH is required for this conversion is 8.}$ $\text{The reaction is as follows:}$ $2\text{CrO}_4^{2-} + 2\text{H}^+ \rightarrow \text{Cr}_2\text{O}_7^{2-} + \text{H}_2\text{O}$ $\text{Cr}_2\text{O}_7^{2-} + 2\text{OH}^- \rightarrow 2\text{CrO}_4^{2-} + \text{H}_2\text{O}$

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
}