Import Question JSON

Current Question (ID: 21245)

Question:

$\text{For the estimation of nitrogen, } 1.4 \text{ g of an organic compound was digested by the Kjeldahl method and the evolved ammonia was absorbed in } 60 \text{ mL of M/10 sulphuric acid. The unreacted acid required } 20 \text{ mL of M/10 sodium hydroxide for complete neutralization. The percentage of nitrogen in the compound is:}$

Options:

1. $10\%$
2. $3\%$
3. $5\%$
4. $6\%$

Solution:

$\text{Percentage of Nitrogen} = \frac{1.4 \times M \times 2 \left( V - \frac{V_1}{2} \right)}{m}$ $\text{Here, } M \text{ is the molarity of sulphuric acid, } V \text{ is the volume of sulphuric acid, } V_1 \text{ is volume of NaOH used to neutralize unreacted sulphuric acid and } m \text{ is the mass of organic compound.}$ $\text{The given values are as follows:}$ $M = 0.1 \text{ M, } V = 60 \text{ mL, } V_1 = 20 \text{ mL, and } m = 1.4 \text{ g}$ $\text{Calculate the percentage of nitrogen as follows:}$ $\text{Percentage of Nitrogen} = \frac{1.4 \times 0.1 \times 2 \left( 60 - \frac{20}{2} \right)}{1.4}$ $= 10\%$

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
}