Import Question JSON

Current Question (ID: 9127)

Question:

$\text{A paramagnetic compound among the following is -}$

Options:

1. $\text{K}_2\text{O}$
2. $\text{K}_2\text{O}_2$
3. $\text{Na}_2\text{O}_2$
4. $\text{RbO}_2$

Solution:

$\textbf{HINT:} \text{ Paramagnetic species contains unpaired electrons.}$ $\textbf{Explanation:}$ $\text{RbO}_2 \text{ is a superoxide(contains } \text{O}_2^- \text{ which is paramagnetic).}$ $\text{Electronic configuration of } \text{O}_2^- \text{ (17 electrons)}$ $= \sigma_{1s}^2, \sigma_{1s}^{*2}, \sigma_{2s}^2, \sigma_{2s}^{*2}, \sigma_{2pz}^2, \pi_{2px}^2 \approx \pi_{2py}^2, \pi_{2px}^{*1} \approx \pi_{2py}^{*1}$ $\text{O}^{2-} \text{ \& } \text{O}_2^{2-} \text{ are diamagnetic while } \text{O}_2^- \text{ is paramagnetic in nature. } \text{K}_2\text{O} \text{ gives } \text{O}^{2-}\text{, } \text{K}_2\text{O}_2 \text{ \& } \text{Na}_2\text{O}_2 \text{ gives } \text{O}_2^{2-} \text{ while } \text{RbO}_2 \text{ gives } \text{O}_2^-$

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
}