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Current Question (ID: 8611)

Question:

$\text{Which of the following does not represent a redox reaction?}$

Options:

1. $\text{Cr}_2\text{O}_7^{2-} + 2\text{OH}^- \rightarrow \text{CrO}_4^{2-} + \text{H}_2\text{O}$
2. $\text{SO}_4^{2-} + 2\text{I}^- + 2\text{H}^+ \rightarrow \text{I}_2 + \text{H}_2\text{S} + \text{H}_2\text{O}$
3. $\text{Ca} + 2\text{H}_2\text{O} \rightarrow \text{Ca(OH)}_2 + \text{H}_2$
4. $\text{PCl}_5 \rightarrow \text{PCl}_3 + \text{Cl}_2$

Solution:

$\text{Hint: Oxidation and reduction occur simultaneously}$ $\text{Since there is no change in oxidation state in this reaction, it is not a redox reaction.}$ $\text{Cr}_2\text{O}_7^{2-} + 2\text{OH}^- \rightarrow \text{CrO}_4^{2-} + \text{H}_2\text{O}$ $\text{In this reaction, the oxidation state of Cr remains +6 in both Cr}_2\text{O}_7^{2-} \text{ and CrO}_4^{2-}\text{. There is no change in oxidation state of any element, so this is not a redox reaction.}$

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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
}