Import Question JSON

Current Question (ID: 18798)

Question:

$\text{Colourless ion among the following is:}$

Options:

1. $\text{Cr}^{+4}$
2. $\text{Sc}^{+3}$
3. $\text{Ti}^{+3}$
4. $\text{V}^{+3}$

Solution:

$\text{HINT: Metal ions with } d^0 \text{ and } d^{10} \text{ configuration are colourless.}$ $\text{Generally, transition metals are coloured because of d-d transition (because of unpaired electrons).}$ $\begin{array}{|c|c|} \hline \text{Metal ions} & \text{Configuration} \\ \hline \text{Cr}^{+4} & d^2 \\ \text{Sc}^{+3} & d^0 \\ \text{Ti}^{+3} & d^1 \\ \text{V}^{+3} & d^2 \\ \hline \end{array}$ $\text{Sc}^{+3} \text{ will be colourless because of } d^0 \text{ configuration. All others are coloured.}$ $\text{Hence the correct option is the second option.}$

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
}