Import Question JSON

Current Question (ID: 18826)

Question:

$\text{In an aqueous solution, coloured ions would be:}$

Options:

1. $\text{Ti}^{3+}, \text{V}^{3+}, \text{Cu}^{+}$
2. $\text{Sc}^{3+}, \text{Mn}^{2+}, \text{Fe}^{3+}$
3. $\text{Ti}^{3+}, \text{V}^{3+}, \text{Mn}^{2+}, \text{Fe}^{3+}, \text{Co}^{2+}$
4. $\text{None of the above.}$

Solution:

$\text{HINT: Ion must contain unpaired electrons.}$ $\text{Explanation:}$ $\text{STEP 1: Generally transition metal ions show colour due to d-d transition.}$ $\text{So, presence of unpaired electrons is a must.}$ $\text{Those ions that contain unpaired electrons are colored in an aqueous solution.}$ $\text{STEP 2:}$ $\begin{array}{|c|c|c|} \hline \text{Metal ions} & \text{Electronic configuration} & \text{No. of unpaired electrons} \\ \hline \text{Sc}^{3+} & d^0 & 0 \\ \text{Ti}^{3+} & d^1 & 1 \\ \text{V}^{3+} & d^2 & 2 \\ \text{Mn}^{3+} & d^4 & 4 \\ \text{Fe}^{3+} & d^5 & 5 \\ \text{Co}^{3+} & d^6 & 6 \\ \text{Cu}^{+} & d^{10} & 0 \\ \hline \end{array}$ $\text{Among all the given ions, } \text{Ti}^{3+}, \text{V}^{3+}, \text{Mn}^{2+}, \text{Fe}^{3+}, \text{and } \text{Co}^{2+} \text{ contain unpaired electrons hence they are colored.}$

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
}