Import Question JSON

Current Question (ID: 9206)

Question:

$\text{A substance that gives a brick red flame and breaks down on heating giving oxygen and a brown gas is-}$

Options:

1. $\text{Calcium carbonate.}$
2. $\text{Magnesium carbonate.}$
3. $\text{Magnesium nitrate.}$
4. $\text{Calcium nitrate.}$

Solution:

$\text{HINT: NO}_2 \text{ is brown coloured gas.}$ $\text{Explanation:}$ $\text{1.}\text{CaCO}_3 \xrightarrow{\Delta} \text{CaO} + \text{CO}_2\text{(Colourless gas)}$ $\text{2. }\text{MgCO}_3 \xrightarrow{\Delta} \text{MgO} + \text{CO}_2\text{(Colourless gas)}$ $\text{3. }\text{MgNO}_3 \xrightarrow{\Delta} \text{MgO} + \text{NO}_2 + \text{O}_2$ $\text{(Brown gas)}$ $\text{But magnesium gives no colour on flame.}$ $\text{4. }2\text{Ca(NO}_3\text{)}_2 \xrightarrow{\Delta} 2\text{CaO} + 4\text{NO}_2 + \text{O}_2$ $\text{(Brown gas)}$ $\text{Calcium nitrate (gives brick red flame) decomposes to give NO}_2 \text{ (brown gas) and O}_2$

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
}