Import Question JSON

Current Question (ID: 21551)

Question:

$\text{When } \text{K}_2\text{Cr}_2\text{O}_7 \text{ is used in an acidic medium during titration, the oxidation number of Cr in the product side is-}$

Options:

1. $+6$
2. $+2$
3. $+3$
4. $+4$

Solution:

$\text{Potassium dichromate, } \text{K}_2\text{Cr}_2\text{O}_7, \text{ is a common inorganic chemical reagent, most commonly used as an oxidizing agent in various laboratory and industrial applications.}$ $\text{As with all hexavalent chromium compounds, it is acutely and chronically harmful to health. In acidic medium it the oxidation state of Cr changes from } +6 \text{ to } +3.$ $\text{The reaction of dichromate in acidic medium will be:}$ $\text{Cr}_2\text{O}_7^{2-} + 14\text{H}^+ + 6\text{e}^- \rightarrow 2\text{Cr}^{3+} + 7\text{H}_2\text{O}$ $\text{Thus, option 3 is the correct answer.}$

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
}