Import Question JSON

Current Question (ID: 9146)

Question:

$\text{A compound X reacts with } \text{K}_2\text{CrO}_4 \text{ and dilute HCl to produce a yellow precipitate and pungent smelling gas.}$ $\text{If X gives a green flame test, then X is:}$

Options:

1. $\text{MgSO}_4$
2. $\text{BaS}_2\text{O}_3$
3. $\text{CuSO}_4$
4. $\text{PbS}_2\text{O}_3$

Solution:

$\text{Hint: Barium salts give green flame colour.}$ $\text{Explanation:}$ $\text{1. } \text{BaS}_2\text{O}_3 \text{ on reaction with dilute acid gives pungent smell gas (SO}_2\text{) and precipitates of S which are yellow in colour.}$ $\text{2. On reaction with potassium chromate, } \text{BaS}_2\text{O}_3 \text{ gives yellow coloured precipitates of } \text{BaCrO}_4$ $\text{BaCrO}_4 \leftarrow^{\text{K}_2\text{CrO}_4} \text{BaS}_2\text{O}_3 \rightarrow^{\text{dil. HCl}} \text{BaCl}_2 + \text{SO}_2 \uparrow + \text{S} \downarrow$ $\text{yellow ppt} \qquad \qquad \text{(X)} \qquad \qquad \qquad \text{(Z)} \qquad \text{(yellow ppt)}$ $\text{Salt of Ba also gives a green flame test.}$

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
}