Import Question JSON

Current Question (ID: 10962)

Question:

$\text{Lassaigne's test can detect:}$

Options:

1. $\text{Nitrogen, Sulphur, Halogens}$
2. $\text{Nitrogen, Cyanides, Sulphur}$
3. $\text{Sodium, Sulphur, Halogens, Phosphorus}$
4. $\text{Nitrogen, Sulphur, Halogens, Phosphorus}$ (Correct)

Solution:

$\text{HINT- This test is employed to detect the presence of nitrogen, sulphur, halogens, and phosphorous in an organic compound.}$ $\text{STEP1- These elements are present in the covalent form in an organic compound. These are converted into the ionic form by fusing the compound with sodium metal.}$ $\text{Na} + \text{C} + \text{N} \xrightarrow{\Delta} \text{NaCN}$ $2\text{Na} + \text{S} \xrightarrow{\Delta} \text{Na}_2\text{S}$ $\text{Na} + \text{X} \xrightarrow{\Delta} \text{NaX} \text{ (X = Cl, Br, I)}$ $\text{STEP2- The cyanide, sulphide, and halide of sodium formed are extracted from the fused mass by boiling it in distilled water. The extract so obtained is called Lassaigne's extract. This Lassaigne's extract is then tested for the presence of nitrogen, sulphur, halogens, and phosphorous.}$

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
}