Import Question JSON

Current Question (ID: 18904)

Question:

$\text{Which compound cannot decolourise KMnO}_4 \text{ solution?}$

Options:

1. $\text{CO}_3^{2-}$
2. $\text{NO}_2^{-}$
3. $\text{S}^{2-}$
4. $\text{Cl}^{-}$

Solution:

$\text{HINT: KMnO}_4 \text{ can not be decolourised by CO}_3^{2-}$ $\text{Explanation:}$ $\text{Element present in maximum oxidation state in a compound does not oxidised further by any oxidising agent}$ $\text{KMnO}_4 \text{ is an oxidising agent but CO}_3^{2-} \text{ is not a reducing agent. So no redox reaction between KMnO}_4 \text{ and CO}_3^{2-} \text{. The oxidation state of carbon in carbonate ion is +4 and we cannot further oxidised carbon. So, no redox reaction between KMnO}_4 \text{ and CO}_3^{2-} \text{ will occur.}$

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
}