Import Question JSON

Current Question (ID: 20920)

Question:

$\text{The ionic radii (in \AA) of } \text{N}^{3-}, \text{O}^{2-} \text{ and } \text{F}^{-} \text{ are respectively:}$

Options:

1. $1.36, 1.40 \text{ and } 1.71$
2. $1.36, 1.71 \text{ and } 1.40$
3. $1.71, 1.40 \text{ and } 1.36$
4. $1.71, 1.36 \text{ and } 1.40$

Solution:

$\text{Hint: These are isoelectronic species}$ $\text{Calculate the number of electrons in the given species as follows:}$ $\begin{array}{c|c|c|c} \text{Ion} & \text{N}^{3-} & \text{O}^{2-} & \text{F}^{-} \\ \hline \text{Atomic no.} & 7 & 8 & 9 \\ \text{No. electrons} & 10 & 10 & 10 \end{array}$ $\text{The number of electrons in } \text{N}^{3-}, \text{O}^{2-}, \text{F}^{-} \text{ is same}$ $\text{Hence, these are isoelectronic species. In isoelectronic series, as negative charge increase the size of the ion also increases.}$ $\text{The order of ionic radii is as follows:}$ $\text{N}^{3-} > \text{O}^{2-} > \text{F}^{-}$ $1.71 \ \AA \ 1.40 \ \AA \ 1.36 \ \AA$

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
}