Import Question JSON

Current Question (ID: 20950)

Question:

$\text{According to molecular theory, the species among the following that does not exist is:}$

Options:

1. $\text{He}_2^{+}$
2. $\text{He}_2^{-}$
3. $\text{Be}_2$
4. $\text{O}_2^{2-}$

Solution:

$\text{Hint: A chemical species with a bond order of zero does not exist.}$ $\text{The bond order of a given species according to molecular orbital theory is as follows:}$ $\begin{array}{cc} \text{Chemical Species} & \text{Bond Order} \\ \text{He}_2^{+} & 0.5 \\ \text{He}_2^{-} & 0.5 \\ \text{Be}_2 & 0 \\ \text{O}_2^{2-} & 1 \end{array}$ $\text{According to M.O.T., if the bond order of a chemical species is zero, then that chemical species does not exist. Hence, } \text{Be}_2 \text{ will not exist.}$ $\text{Thus, option 3 is the correct answer.}$

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
}