Import Question JSON

Current Question (ID: 18842)

Question:

$\text{Which of the following statements is true?}$

Options:

1. $\text{Cu(II)}_{\text{aq}} \text{ is more stable.}$
2. $\text{Cu(II)}_{\text{aq}} \text{ is less stable.}$
3. $\text{Cu(I) and Cu(II) are equally stable.}$
4. $\text{Stability of Cu(I) and Cu(II) depends on nature of copper salts.}$

Solution:

$\text{HINT: Cu(I) disproportionate in aqueous solution.}$ $\text{Explanation:}$ $\text{STEP 1:}$ $\text{The electronic configuration of Cu is: [Ar] 3d}^{10} \text{ 4s}^{1} \text{ and Cu}^{+} \text{ is [Ar] 3d}^{10} \text{ which is stable configuration.}$ $\text{Still, in an aqueous solution, Cu(II) ion is more stable than Cu(I).}$ $\text{STEP 2:}$ $\text{In an aqueous medium, Cu}^{2+} \text{ is more stable than Cu}^{+}. \text{ This is because although energy is required to remove one electron from Cu}^{+} \text{ to Cu}^{2+}, \text{ the high hydration energy of Cu}^{2+} \text{ compensates for it.}$ $\text{Therefore, Cu}^{+} \text{ ion in an aqueous solution is unstable. It disproportionates into Cu}^{2+} \text{ and Cu}$ $2 \text{Cu}^{+} \rightarrow \text{Cu}^{2+} + \text{Cu}$

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
}