Import Question JSON

Current Question (ID: 10567)

Question:

$\text{A brown ring formed in the ring test for } \text{NO}_3^- \text{ ion is due to the formation of:}$

Options:

1. $[\text{Fe}(\text{H}_2\text{O})_5(\text{NO})]^{2+}$ (Correct)
2. $\text{FeSO}_4.\text{NO}_2$
3. $[\text{Fe}(\text{H}_2\text{O})_4(\text{NO})_2]^{2+}$
4. $\text{FeSO}_4.\text{HNO}_3$

Solution:

$\text{HINT- } [\text{Fe}(\text{H}_2\text{O})_5(\text{NO})]^{2+} \text{ is Brown coloured complex.}$ $\text{Explanation: When freshly prepared solution of } \text{FeSO}_4 \text{ is added in a solution containing } \text{NO}_3^- \text{ ion.}$ $\text{It leads to formation of a brown coloured complex. This is known as brown ring test of nitrate.}$ $\text{The chemical reactions for Brown ring test are:}$ $\text{1. } \text{NO}_3^- + 3\text{Fe}^{2+} + 4\text{H}^+ \rightarrow \text{NO} + 3\text{Fe}^{3+} + 2\text{H}_2\text{O}$ $\text{2. } [\text{Fe}(\text{H}_2\text{O})_6]^{2+} + \text{NO} \rightarrow [\text{Fe}(\text{H}_2\text{O})_5(\text{NO})]^{2+} + \text{H}_2\text{O}$ $\text{Brown ring}$

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
}