Import Question JSON

Current Question (ID: 21189)

Question:

$\text{Which of the following is a redox reaction?}$

Options:

1. $\text{NaCl} + \text{KNO}_3 \rightarrow \text{NaNO}_3 + \text{KCl}$
2. $\text{CaC}_2\text{O}_4 + 2\text{HCl} \rightarrow \text{CaCl}_2 + \text{H}_2\text{C}_2\text{O}_4$
3. $\text{Ca(OH)}_2 + 2\text{NH}_4\text{Cl} \rightarrow \text{CaCl}_2 + 2\text{NH}_3 + 2\text{H}_2\text{O}$
4. $2\text{K[Ag(CN)}_2] + \text{Zn} \rightarrow 2\text{Ag} + \text{K}_2[\text{Zn(CN)}_4]$

Solution:

$\text{Hint: One involving oxidation and the other involving reduction.}$ $\text{In all these cases during the reaction, there is no change in the oxidation state of the ion or molecule, or constituent atom, these are simply ionic reactions.}$ $(d) \ 2\text{K[Ag(CN)}_2] + \text{Zn} \rightarrow 2\text{Ag} + \text{K}_2[\text{Zn(CN)}_4]$ $\text{Ag}^+ \rightarrow \text{Ag} \text{ gaining of e}^- \text{, reduction}$ $\text{Zn} \rightarrow \text{Zn}^{2+} \text{ loss of e}^- \text{, oxidation}$

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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
}