Import Question JSON

Current Question (ID: 21219)

Question:

$\text{The violet coloured complex formed in the Lassaigne's test is:}$

Options:

1. $\text{Na}_4[\text{Fe(CN)}_5\text{NOS}]$
2. $\text{Na}_2[\text{Fe(CN)}_5\text{NO}]$
3. $\text{K}_4[\text{Fe(CN)}_6]$
4. $\text{Fe}_4[\text{Fe(CN)}_6]_3$

Solution:

$\text{Hint: sodium nitroprusside is used.}$ $\text{When an organic compound contains sulphur as one of the atoms}$ $\text{then on treating sodium fusion extract with sodium nitroprusside, the}$ $\text{appearance of a violet colour takes place and it indicates the}$ $\text{presence of sulphur.}$ $\text{The reaction is as follows:}$ $\text{S}^{2-} + [\text{Fe(CN)}_5\text{NO}]^{2-} \rightarrow [\text{Fe(CN)}_5\text{NOS}]^{4-}$ $\text{The violet colour is due to the formation of } [\text{Fe(CN)}_5\text{NOS}]^{4-}.$ $\text{Hence, option first is the correct answer.}$

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
}