Import Question JSON

Current Question (ID: 8553)

Question:

$\text{Out of } \text{Ca}^{2+}, \text{ Al}^{3+}, \text{ Cr}^{3+}, \text{ Mg}^{2+}, \text{ and } \text{Zn}^{2+}, \text{ the reagents } \text{NH}_4\text{Cl and aqueous } \text{NH}_3 \text{ will precipitate}$

Options:

1. $\text{Ca}^{2+}, \text{ Al}^{3+}$
2. $\text{Al}^{3+}, \text{ Cr}^{3+}$
3. $\text{Bi}^{3+}, \text{ Mg}^{2+}$
4. $\text{Mg}^{2+}, \text{ Zn}^{2+}$

Solution:

\text{Hint: Salt analysis: } \text{NH}_4\text{Cl} + \text{NH}_4\text{OH} \text{ is a reagent of third group.} \text{In salt analysis, } \text{NH}_4\text{Cl} + \text{NH}_4\text{OH} \text{ is used as a reagent for third group cation. It only precipitate third group cation in the form of hydroxide.} \text{Thus, } \text{NH}_4\text{Cl} + \text{NH}_4\text{OH} \text{ precipitate radical of group III viz. } \text{Al}^{3+} \text{ and } \text{Cr}^{3+}.

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
}