Import Question JSON

Current Question (ID: 8597)

Question:

$\text{The oxidation number of the atom (in bold) in the following species is given. Identify, which one is incorrectly related?}$

Options:

1. $\text{Cu}_2\text{O} \text{ is } -1$
2. $\text{ClO}_3^- \text{ is } +5$
3. $\text{K}_2\text{Cr}_2\text{O}_7 \text{ is } +6$
4. $\text{HAuCl}_4 \text{ is } +3$

Solution:

$\text{Hint: Metal does not show a negative oxidation state.}$ $\text{Let calculate the oxidation state of the bold atom as follows:}$ $\text{Cu}_2\text{O}$ $\text{Cu} = X, \text{O} = -2$ $2X + (-2) = 0$ $X = 1$ $\text{ClO}_3^-$ $\text{Cl} = Y, \text{O} = -2$ $Y + (-2 \times 3) = -1$ $Y = -1 + 6$ $Y = 5$ $\text{K}_2\text{Cr}_2\text{O}_7$ $\text{K} = 1$ $\text{Cr} = Z, \text{O} = -2$ $2 \times 1 + 2Z + (-2 \times 7) = 0$ $2Z = 12$ $Z = +6$ $\text{HAuCl}_4$ $\text{H} = +1$ $\text{Au} = U, \text{Cl} = -1$ $1 + U + (-1 \times 4) = 0$ $U = +3$ $\text{Hence, option first is the answer.}$

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
}