Import Question JSON

Current Question (ID: 18839)

Question:

$\text{Which compound exhibits colour in its solid state?}$

Options:

1. $\text{Ag}_2\text{SO}_4$
2. $\text{CuF}_2$
3. $\text{ZnF}_2$
4. $\text{Cu}_2\text{Cl}_2$

Solution:

$\text{HINT: CuF}_2 \text{ is coloured among the given options.}$ $\text{Explanation: Generally colour in transition metals arises due to d-d transition.}$ $1) \text{Ag}^{+} - 4d^{10}5s^{0} \text{ have completely filled d orbital}$ $2) \text{Cu}^{2+} - 3d^{9}4s^{0} \text{ have incompletely filled d orbital}$ $\text{Blue-Gray to Gray}$ $3) \text{Zn}^{2+} - 3d^{10}4s^{0} \text{ have completely filled d orbital}$ $4) \text{Cu}^{+} - 3d^{10}4s^{0} \text{ have completely filled d orbital}$ $\text{So option (2) is correct as it has unpaired electron therefore it shows colour}$ $\text{Blue-Gray to Gray}$

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
}