Import Question JSON

Current Question (ID: 7891)

Question:

$\text{The correct sequence of increasing radii is:}$

Options:

1. $\text{Ar} < \text{K}^+ < \text{Ca}^{2+}$
2. $\text{Ca}^{2+} < \text{Ar} < \text{K}^+$
3. $\text{Ca}^{2+} < \text{K}^+ < \text{Ar}$ (Correct)
4. $\text{K}^+ < \text{Ar} < \text{Ca}^{2+}$

Solution:

$\text{HINT: Neutral atom will have more atomic radii than cation.}$ $\text{Explanation:}$ $\text{In isoelectronic species as the positive charge increases the size of cation decreases.}$ $\text{The correct order of radii in increasing order is: Ca}^{2+} < \text{K}^+ < \text{Ar}$ $\text{Ar, K}^+ \text{ and Ca}^{2+} \text{ are isoelectronic i.e. with same number of electrons: 18. For isoelectronic species ionic radii decreases with increase in effective (relative) positive charge. Also Ar, K and Ca belong to the same period (3rd period).}$

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
}